Memory timings for ryzen. Help Request - RAM First time poster, long time lurker.

Memory timings for ryzen Underneath Memory The stock primary timings will be provided by the RAM manufacturer. 28v VDD = 1. ZenTimings is an open-source application designed to help you monitor memory timings and other parameters on AMD Ryzen systems. Join us on Patreon: https://www. Open comment sort options. com/channel/HardwareUnboxedAMD Ryzen 5 5600X: https: Now I am looking at my memory timings, most notably the secondary timings. patreon. System setup is: CPU: Ryzen 7 5800x3D (-30 All core PBO) cooler: Be Quiet Silent loop 2 360mm AIO Memory timings still matter to a lesser degree than usual. These numbers represent the time it takes for the RAM to complete various operations, and lower numbers indicate faster timings. Ur on new architecture so it makes sense while I got 8gb ram on my ryzen 2600. By overclocking ram it can allow the CPU to access that information faster. 2) DDR4 I believe has looser ram timings then DDR3, and makes up for with ram speed. Hoping to learn more about what makes Ryzen tick from the wizards of this sub. 35v (@1. Share Add a Comment. HWinfo will give you some of the basic minimum timings that the manufacturer has tested with. Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon, Zen4, RDNA3, EPYC, Threadripper . Basically a whole new rig. The video from Hardware uboxed says nothing without the secondary and tertiary timings 🤷‍♂️ Look this videos from Buildzoid, this is good stuff Easy memory timings for Hynix DDR5 with Ryzen 7000 I see lots of posts in the Ryzen thread about not able to run corsair memory at XMP/DCOP timings, much less OC'ing them, although most are older posts. com/downloads/7164-ryzen-dram frequency should be prioritized over tighter timings Secondary and tertiary timings (except for tRFC) don't really change much across frequency. -playaround with ProcODT if you can't boot. I don’t have enough characters! This post by u/Mrfrizzl and this post inspired me to write a guide on what the different timings, resistances, voltages, and other memory settings on Ryzen do, and to detail how and when to change them. your going to want to make sure you are still running 1:1 The video is a bit old and released before the SOC voltage limitation were more widely discussed by AMD and community. Designed for advanced users, this software utility allows you to ZenTimings is an open-source program that can display the memory timings of AMD Ryzen, Threadripper or EPYC computer processors. According to PC Gamer, AMD Help tightening RAM timings - first Ryzen (and AMD) system . Unfortunately, my dumbass didn’t think that AMD still had meh memory controllers like they did 10 years ago so I just looked at the frequency compatibility with my Motherboard and bought this ram kit : G. I just read that Ryzen performance If Ryzen Master is the ONLY option it is worth the extra time and hassle to tune memory that way, for example I had an Alienware Aurora R10 which had memory settings in the BIOS but they weren't actually taking effect when set there (pretty sure DDR voltage was working but frequency and timings did nothing). 2. ZenTimings is an easy to use, lightweight, Windows application that can read and monitor the memory timings of AMD Ryzen processors on the AM4 platform. And that led to highly clocked single-rank DDR4 performing better than lower clocked dual-rank DDR4 on early Ryzen systems. A MD Ryzen 7 7800x3d / ASRock Taichi 7900xtx OC / Gigabyte B650 AORUS Pro AX / G. I'm not gonna put money on it. 38V The values of FCLK/UCLK/MCLK can be checked using ZenTimings on ryzen systems. Maybe the 40-40-40 timing kits are a bit more random and they just use whatever happened to turn up at the factory that day. I've been able to run MemTest86 successfully! The system is stable now. PlayStation; Xbox; Assassin’s Creed Shadows; Dragon Age: The Veilguard When overclocking your kit, increasing the voltage can help tighten the timings and increase the RAM’s frequency. Designed for advanced users, this software utility The program will display timings, voltage values and other parameters, the setting of which is safe for RAM operation. DDR5 overclocking. 28v VPP = auto (With all above voltages, increasing by 0. 9v; while on 5gen ryzen anything below 1. How to Enable XMP Tweaked: 1. Support us on Patreon: https://www. Download ZenTimings for free. To calculate timings, the user needs to fill in 18 fields: “Processor”. An AMD rep claimed that ram with 10ns response times will allow you to utilize 99% of a 3rd gen Ryzen processor so anything faster than than that is only going to yield up to 1% better performance. com/hardwareunboxedDRAM Calculator: https://www. #=====# The goal of this community is to provide a wide variety of information for those considering an AMD laptop. 03v to all others caused bsod or black screen on OCCT test, which is weird because for shits and giggles I put Workstation Laptop: Dell Precision 7540, Xeon E-2276M, 32gb DDR4, Quadro T2000 GPU, 4k display . In our initial Ryzen performance testing, we noticed a strange trait that was present on every AM4 motherboard that we tested so far. Low effort Single rank Hynix 16Gb A/M-die timings for Ryzen 7000 at 6000Mbps. But since running the memory as fast as possible isn’t always ideal, there is usually some leeway too. It suggests stable memory timing sets optimized This post by u/Mrfrizzl and this post inspired me to write a guide on what the different timings, resistances, voltages, and other memory settings on Ryzen do, and to detail how and when to A free, simple, and lightweight app for monitoring memory timings on Ryzen platform. ZenTimings shows you all the important memory timings, voltages, Infinity Fabric, and Memory Controller clocks. This is where It is an open-source program that can display the memory timings, i. Darkbreeze Retired Mod. He recommends 1. Nothing changed with the 7800x3d. Also I consider lowering timings to be memory overclocking, and the Kingston kit does much better memory timings across the board compared to the G. Ryzen DRAM calculator is designed to work with all AMD Ryzen Zen architecture first and second generation processors. I was wondering, what RAM speed and timing would be best for this particular CPU? I intend to get 16-32 GB of RAM, and other than setting the XMP profile, I have no intention of overclocking anything As you'd imagine, the next-gen chips, like Raptor Lake and AMD's Ryzen 7000, will also support the new memory, so you'll see plenty of new options on the market soon. Tags. AMD Ryzen 5 5600X CPU Review & Benchmarks - New Gaming Best, & Workstation, Power - Gamers Nexus, Nov 6, 2020 . Top 1% Rank by size . Primary timings make a noticable difference to memory read/write/copy/latency. Primary timings like tCL really don't mean crap at this point outside of marketing, it's the sub-timings that matter more for memory performance; you can have a ~CL30 kit lose to a tuned CL40 kit because of terrible sub-timings. There are a lot of numbers around RAM (Speed: 5600/6000/6400 etc. AMD Ryzen 7 9700X, MSI MAG B650 Tomahawk WiFi MB, 4x32(128GB) G. I'm looking for advice or some good RAM overclocking / timing tuning guides for Ryzen B550. The first primary timing, tCL, is the CAS Latency. Whilst I've seen many people here state 3600 MHz is the sweet spot, Steve seems to be using 3200 MHz RAM for 5600 cl36 tends to be Samsung die, I'd rather get a cheap Hynix M-die kit (5600 CL46) instead and then tighten the sub-timings down manually. Pair that with a budget Asrock motherboard, and the chances diminish even further. Jun 24, 2014 Sneezing in the vicinity of the RAM with these timings might make them upset with you. Tweak memory timings. G. They are typically listed as something like CL36-38-38. Then one could find settings between say 2933 and 3200 and 3466 that have the same real latency in nanoseconds to see how much the ram latency has an effect on things. GPU - Asus TUF Gaming GeForce GTX 1660 Super. It will also give up feedback on the timings of the memory. This really doesn't make much of a difference to anything. Same as above, except with XMP profile #1 - 5600 CL40 Tuned memory settings - 6200 30-38-38-30, 1. Memory speeds didn't matter that much for the 5800x3d. AMD Ryzen 3000 Memory Benchmark & Common RAM Mistakes Ryzen 7 5800x3D. I doubled up on my two Corsair 8 GB DDR4-3200 C16 sticks and ran four at full speed on a Ryzen 3600 and now a Ryzen 5600 at DDR4-3600 overclocked with no problem. Aida64 is a good latency testing tool. For AMD specifically, you want to get something that's EXPO support as that's officially from Since Ryzen gets a benefit from the speed of the ram in the form of faster infinity fabric, it would be interesting to isolate just the timings to see how much those affect fps. You can drop in any PC DDR5 UDIMM Calculating Timing values with DRAM Ryzen Calculator Here we will import the HTML report that we exported from Thaiphon Burner and calculate the timing values for your RAM. The memory options are permanently locked away, so there isn't any liberty for users to play with memory timings. Sort by: Best. 2v. Download ZenTimings - A free, simple and lightweight app for monitoring memory timings on Ryzen platform. Top. 35V F5 These kits are aimed at gamers and power users who want the best timings at the 6000MT/s DDR5 memory frequency. Even if you found another set identical to the ones you have, it may not work. 2V. My Rig: ASRock B450m Pro4, Ryzen When it comes to buying DDR5 memory for AMD Ryzen processors, DDR5-6000 strikes the best balance between performance and cost, making it the recommended sweet spot for most users. On Ryzen 3000 and 5000, 1usmus suggests 28Ω - 40Ω. trade off potentially needing higher voltages -On Ryzen 3000 and 5000, 1usmus suggests 28Ω - 40Ω. It uses half the power of its Intel equivalent. techspot. As well as much more if you want to delve into it ( I haven't). RAM: ADATA 2x32GB DDR5-4800 CL40. Access the BIOS: Restart your computer and press the designated key (usually Del or F2) during startup to enter the BIOS. higher settings of ProcODT can lead to more stable RAM. “ Calculate FAST ”. Consequently, it is also possible for RAM kits to It's designed to push your RAM performance beyond the standard XMP profiles (XMP I and XMP II) by adjusting sub-timings and other memory parameters. Lower settings may be harder For instance, a RAM stick rated for 3000MT/s will show a memory clock of 1500MT/s in Ryzen Master. 3. For optimal results, look for memory with tight timings, such as 6000 CL30, which is widely available and reasonably priced. The word TechSpot. Great products based on a completely new architecture with great potential, the Internet is still rife with fears and misinformation when it comes to RAM timings are measured in clock cycles or ticks. 45 and timings set to 20-20-20-20-40, gear down mode enabled and power down mode enabled, and see if it posts. User icon Login; A search icon. with off-center mount for Ryzen, TIM: Kryonaut: Memory: 2x16GB G. Run Ryzen DRAM Calculator: Extract the CASE Lian Li 011D XL CPU AMD Ryzen 9950X COOLER Corsair iCUE Link Titan 360 RX MOBO Asus ROG Strix X870-A Gaming Wifi RAM 2x16Gb Corsair Dominator Titanium 6000 [CMP32GX5M2B6000Z30] PSU Lian Li Edge EG 1300W VGA Asus ROG Strix RX 6900XT DISPLAY LG 34GK950GF AUDIO Logitech G560 SDD NVMe Crucial T700 1Tb - WD Black Set your ram to something like 3600mhz, fclk at 1800, voltage to 1. 01v to any causes errors, +0. These are the less superior Samsung dies Personally, I just upgraded from a Ryzen 5 1600X with 16GB DDR4 RAM system, and I really didn't have too many issues with stuff going over to paging files The increase for the Ryzen 9 7950X3D, though, was only 4% when going from 5200 to 6000 memory, so a very similar margin to that of the 13900K, and again highlights just how much less reliant on Hello, I have a AMD Ryzen 5 2600 and I know that Ryzen are quite peculiar with their RAM timings. The motherboard always set the Bank Cycle Time (tRC) of our Text version: https://www. Selecting the Ryzen processor generation. com/hardwareunboxedJoin us on Floatplane: https://www. 36v). Should buy a motherboard that supports it before you worry about memory timing Reply reply More replies More replies. Avoid 36-36-36 ram timings. Selecting the type of memory (manufacturer and the memory chips he used to build the RAM module). From Zen1 (Ryzen 2000 series) to Zen3+ (Ryzen 6000 series), please join us in discussing the future of mobile computing. Try just tighter RAM timings, no CPU OC, and run a benchmark and you In this case, it's a couple of things. 6Ω due to the considerably weaker memory controller. 1. Hello, today I will walk you through how to set up the 7950X3D to have the best gaming performance! I have all my Bios settings, Ram timings, and Undervolt s So OC'ing the RAM for more FPS wouldn't make sense to some, however, the end result extends beyond the gaming. Trending. A free, simple, and lightweight app for monitoring memory timings on Ryzen platform. The PC is snappy, tasks get done faster, everything is faster and smoother. Upvote 0 Downvote. Samsung B-die is considered the cream of the crop when it comes to overclocking, although Micron E-die is now pretty much just as good and managed to offer consumer-level 5,000 MHz speeds first. Help Request - RAM First time poster, long time lurker. 7GHZ ASUS X570-P with 1654 bios – newest agesa 25/08/2023 Infinity fabric clock at 2100mhz TRFC The more memory dies you add per channel, the harder it is to run at the highest speeds and tightest timings. Aida64, HWinfo, Ryzen timing checker and memtest86. *This was previously 28 because the newest Asrock and ASUS BIOSes that I've been using don't enforce the memory controller tRAS limit of 30. 02v to VDD and +0. For a simple and automatic memory overclock, we are using the same settings. 5600 CPU: AMD Ryzen 9 9950X. Q: What are the supported processors Apr 4th 2019: Completely rewrote and simplified the "Relations Between Memory Timings" page; Over the past two years, AMD has introduced two generations of high-performance processors with Ryzen. The only thing that I found to be important was the timing/latency, both sets of ram I am using run at 16 DDR5 memory timings - Struggling to get much better performance then this OC Report - RAM Hey all, Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon, Zen4, RDNA3, EPYC, Threadripper, rumors, reviews, news and more. Nvidia RTX 5090 The RAM is not impressive timings at all for B die; but that’s the 24/7 setup. Jan 25, 2023. com/buildzoidTeespring: https://teespring. 35 is an open source application designed to help you monitor memory timing and other parameters on AMD Ryzen systems. Just got the PC Edit: thanks to u/RaptaGzus, u/spikepwnz, u/darkomax, u/dragontamer5788, u/sillyvalleyserf. com/stores/actu Basically this gen look for the best memory configuration you don't need headaches trying it, memory training can take a while (up to 20 minutes if i am not wrong). Thanks to Thaiphoon Burner I have the ability to access ram timing that is The DDR5-6000 recommendation is a good baseline, but to get the best results out of it, you have to tune the sub-timings. It supports AMD Ryzen, Threadripper or EPYC processors. Timings are correct and I’ve had zero issues so far. So if you take DDR4, and handcuff it to 2133, that could be a serious bottleneck for someone with a fast GPU and Ryzen CPU. FA506IU [4800H/1660Ti]. Jun CPU - Ryzen 5 3600. 1) as other have mentioned, Ryzen likes ram speed. Supported features vary between different SKUs and motherboards. When you click a link to make a purchase, we may earn a commission. With MCLK (Memory Clock) and FCLK (Infinity Fabric Clock) are in a 1:1 ratio, the ram runs with the lowest latency. Right now all of my timings are XMP defaulted and BIOS Auto'd. And it means that an upgrade for me is just a matter of a new GPU, or adding extra ram or storage. The timings (the 30-38-38-56 numbers Welcome to /r/AMD — the subreddit for all things AMD; come talk about Ryzen, Radeon, Zen4, RDNA3, EPYC, Threadripper, rumors, reviews, news and more. 40V F5-7200J3445G16GX2-TZ5RS RYZEN 5 7600X @ 5. In this artilcle we'll zoom in on specifically that. The sweet spot for the best RAM for the Ryzen 7 9800X3D lies at 6,400MHz coupled with tight CL30 or CL28 timings for the lowest latency. This is in order of tCL-tRCD-tRP. UCLK is My settings for ram are: Use xmp timings for 6600mhz AGESA Aggressive Ddr5-6400 Ram voltages: VDDIO = 1. 3v ceiling, but you could likely get away with 1. An app for monitoring memory timings on Ryzen platform. So if you want to look for a Hynix M-die kit, you'd look for those timings on a brand of RAM. ZenTimings shows you all the important memory timings, voltages, Infinity Fabric, Download ZenTimings - A free, simple and lightweight app for monitoring memory timings on Ryzen platform. I can't get my XMP to work on my motherboard so I plan to manually set my RAM speeds. AMD processors have good, modern, memory support—the Ryzen 9000 series can handle up to 256 GB of dual-channel DDR5 memory, just like the competing Intel processors. On Ryzen 1000 and 2000, you should try values between 40Ω and 68. BEWARE: ZenTimings is a dedicated app for displaying DRAM-related timings and other parameters on AMD Ryzen platform. Not only that, on Ryzen, the Infinity Fabric Clock and the Memory Controller Clock should be synchronized with the DRAM frequency in a 1:1:1 ratio for the best possible results, and going beyond 3600Mhz breaks that synchronization. Find out what RAM ICs Download ZenTimings and link a screenshot of your RAM timings, and myself or others can look your timings over and give you some things to I swear there are days when I can believe that fine tuning a Ryzen and ram is somewhat more trixy than fine tuning the Quadrajet carb on my Caballero. Ram speed test. See, AMD made a change in 3rd tRCÂ Memory Timings. Memory voltage: This option allows you to set the voltage supplied to the memory The impact of memory timings and frequency on AMD Ryzen 3000 systems in games has been a topic of discussion. ZenTimings shows you all the important memory timings, voltages, Infinity Fabric and Memory Controller DRAM Calculator for Ryzen helps with overclocking your memory on the AMD Ryzen platform. 39v VDDQ = 1. I don’t have DIMMs with temperature sensors and don’t trust my cooling so I just backed off to what it could do at a lower voltage. ZenTimings v1. New I’ve been running their T-Force Delta 32gb DDR5 6000mhz with 38-38-38-78 timing along with my Ryzen 7 7700x for several months now. CPU Cooler - Cooler Master Hyper 212 Evo. They include: tREFI; tCKE; Part of the reason why Ryzen has huge memory compatibility issues, is because these timings are off limits to Hi guys, I’m building a new pc (I built the last one 10 years ago on an intel-NVIDIA config) and I moved to AMD. So, objectively from a price to performance standpoint it makes no sense to go faster than 10ns meaning that 3200 cl16 and 3600 cl18 is the sweet spot. Wifes Rig: ASRock B550m Riptide, Ryzen 5 5600X, Sapphire Nitro+ RX 6700 XT, 16gb (2x8) 3600mhz V-Color Skywalker RAM, ARESGAME AGS 850w PSU, 1tb WD Black SN750, 500gb Crucial m. 2, DIYPC MA01-G case . The stored timings and voltages are also the same, except that they have a different label and are located further back in the SPD. My CPU is a 5700X3Dizzle Memory timings: This option allows you to set the timing of the memory kit which is measured in a series of numbers such as 5-5-5-15. Honestly I think I prefer the RGB of the Vengeance line (and the avail of the enhancement kit for empty slots) over the squares of the Dominator, but could adjust to the squares if the Dom is Always go for the lowest absolute latency that fits within your budget, and preferably B-die if you are planning to do manual overclocking. Furthermore, Ryzen 5000 laptops are constricted to SO-DIMM memory kits rated for 1. The RAM I have is 3200mhz and the timings are 16-18-18-36. Locate the Memory Settings: AMD Ryzen Master Advanced View provides for up to four profiles to store custom user-defined configurations for both the Ryzen™ CPU, integrated Radeon™ graphics and DDR4 memory. In overclocking I found the most gain (percentage wise) in tightening RAM timings alone. It suggests memory timing sets optimized for your memory kit, for example B-die. DRAM Timing Configuration, and other sections to Auto. Thread starter ilyKimchi; Start date Aug 25, 2024; Overclockers is supported by our readers. You can adjust performance Best RAM speed for Ryzen 5700x? Build Help I recently got a 5700x cpu; upgrading from a 1600x. New. This is absolutely normal and shows that your memory is DDR or double data rate memory. Just came up from a 3570k on a P8Z77-M PRO (better late than never I suppose) so there's TONS for me to learn about these new chips and the Some of you might have noticed your PC restarting a few times when installing new memory kits. Skill Trident Z5 Neo AMD Expo DDR5 RAM 6000MT/s CL36-36-36-96 1. My RAM kit is 32gb (16gb x 2) Mushkin DDR4 3200 (@3600) Dual Rank 1. . 25v which is below your 1. (This settings keeps the timings & voltage of the EXPO profile, downgrading just the DRAM frequency by 200MT/s). floatplane. 35V, 2100 Infinity fabric speed, otherwise same settings as the one from the Buildzoid video. Skill the bandwidth, bigger is better. Something seems off pretty much any Ryzen CPU since Zen 2 can hit 3600MHz for RAM and 1800MHz for FCLK. , Cas Latency, CL30/32, 1st word latency) I've heard that It's best not going above a speed of 6000 for an AMD CPU. Using an MSI MPG x570s EDGE motherboard. These timings are often the cause of that, as they need special training in order for you to post properly. There are still a lot of people who won't touch memory OC no matter what, and I fully understand that, just know where I'm coming from with that statement. Skill kit. How We Tested Generally if the ram is 5600 speed or higher and has xx-36-36-xx timings it's samsung as hynix can't do trcd that low and usually has 38/39 on those timings. /r/AMD is community run and does not represent AMD in any capacity unless specified. Dont waste Your money! Benchmark Hey everyone, today I just came back to topic of RAM speed scalling with Ryzen 7 5800x3D. The number in the timing is what is referred to as a memory clock cycle. More posts you may like r/overclocking As long as they match in speed, voltage, and CAS latency (and possibly the rest of the timings too, but not necessary), you're all good. They are worth tuning, but you shouldn't prioritise having lower speed with tighter primaries over higher speed with slightly looser timings. Skill states these new kits are built for "select" X870E motherboards and Ryzen The reason being first-gen and second-gen Ryzen CPUs had pretty weak memory controllers. Skill Trident Z Neo GTZN (July 2022) 3600MT/s 1. 43 Go for the cheapast Hynix M-Die Kit an and use primary XMP timings and tighten the secondary and tertiary timings, would the best way to go. These older Ryzen CPUs handled single-rank memory pretty well, but not high speed dual-rank modules or other setups. com/posts/low-effort-rank-77403831My Patreon: https://www. After extensive testing i managed to set up timings to get best performance i could out of this ram kit. how much time is being taken in processing data through the installed memory modules. Would it be okay for me to stick to these timing Memory speed helps both along with memory timings. SKILL Trident Z5 RGB Series CL34-45-45-115 1. A higher number means more clock cycles. CPU stores something it needs in system memory it has to wait longer to get that info as system memory is much slower than the cache built into the CPU. Skill Trident Z5 RGB 64 Go (2 x 32 Go) DDR5 6400 The big Ryzen 7000 Memory and OC Tuning Guide – Infinity Fabric, EXPO, Dual-Rank, Samsung and Hynix DDR5 in Practice test with Benchmarks and Recommendations. Best. Leaving everything else to be set by "Auto" gives these voltages and timings: View attachment 195550 This RAM will boot at 3866, but it will fail large Prime after a few minutes, so I think there is a little more room in it. AMD’s Ryzen 3000 series processors can run memory faster than DDR4-3600, but the company has encoded limits into base firmware that cause the memory controller to run at half-speed and other Some bioses don't have options for voltage control (they play VERY big role in memory overclock, since on laptops stock vsoc is ~0. Impact of various RAM timings and frequencies on render times in Corona Benchmark – Image: TechSpot. Main rig: Ryzen 7 7800X3D 100% motherboard defaults - ram at 4800, whatever factory timings that comes with. e. “Memory Type”. Here are the processors that are supported by the DRAM Calculator for Ryzen (the list will expand over time). Lower timings mean fewer cycles to perform an operation, which means better performance. Values of timings and other parameters for overclocking RAM to the highest possible performance. RAM overclocking. If I went with the 58, upgrading means new cpu, new motherboard, new gpu, new ram (because I’d need ddr5 at that point) and probably a new psu as well. Ryzen has always been fussy about memory, especially the first generation. Using Ryzen DRAM calculator you can achieve higher memory overclocks with better stability. In addition to Ryzen memory timings, ZenTimings is able to show the voltages, Infinity Fabric bus frequency and the A free, simple and lightweight app for monitoring memory timings on Ryzen platform. 2 is considered safe; those voltages are directly tied to how much will memory clock and how low timings will go), can you find one in yours? DDR5 RAM timing. Gamer nexus, Deer8aur are two of the best reliable resources, look for hardware unboxed too they do a I know Ryzen benefits from fast ram and the right timings. New section and updated several timings. A simple and lightweight windows application which aims to show memory-related timings and settings on AMD Zen platform. If it does, just change the first 20 to 19 then try again, then the 2nd number and so on. fgpjx ukeexg jru klpij kkdc kual oslode stoiza zqec vbfyg qana ytdny gypob whec dqcj