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[STH-Logo-96px] ServeTheHome Advertisement [INS::INS] [STH-Logo-48px] [STH-Logo-96px] * Forums * AI * Server + Server Systems + Server CPUs + Accelerators + Server Motherboards + Server Chassis + Other Components * 5G Edge * Storage * Networking * Workstation + Workstation Processors + Workstation Motherboards * Software + Operating Systems + Server Applications + Virtualization * Guides + Buyer's Guides + Tips + Top Hardware Components for TrueNAS / FreeNAS NAS Servers + Top Hardware Components for pfSense Appliances + Top Hardware Components for napp-it and Solarish NAS Servers + Top Picks for Windows Server 2016 Essentials Hardware + The DIY WordPress Hosting Server Hardware Guide [ ][Search] Home Workstation The Difference between a Standard DIMM and a CUDIMM or CSODIMM * Workstation The Difference between a Standard DIMM and a CUDIMM or CSODIMM By John Lee - November 8, 2024 3 Facebook Twitter Pinterest Linkedin Email Print Copy URL Crucial DDR5 6400 CUDIMM 1Crucial DDR5 6400 CUDIMM 1 We probably need to have one of these. Recently, memory makers started to take a technology that we have seen for years on the server side, and bring it to the desktop and mobile platforms. The CUDIMM or CSODIMM adds a "C" for clocked, and with it comes some new hardware. The Difference between a Standard DIMM and a CUDIMM or CSODIMM The big difference between the CUDIMM and COSODIMM and their UDIMM/ SODIMM counterparts is the addition of a clock driver. Just to see the difference, here is the front and back of Our Top 96GB DDR5-5600 SODIMM Kit Crucial 2x 48GB Kit. Micron Crucial 96GB DDR5 5600 2x 48GB SODIMM Kit 2Micron Crucial 96GB DDR5 5600 2x 48GB SODIMM Kit 2 Here is the Crucial DDR5-6400 CSODIMM kit that is 2x 16GB. Of course, there is a big difference on the right hand side since the 48GB modules have DRAM chips on the back, but if you look at the front, you will spot the difference. Crucial DDR5 6400 CSODIMM 2Crucial DDR5 6400 CSODIMM 2 Here is a close-up of the front of the CSODIMM. You can see in the middle under the label that there is a Montage clock driver chip. Crucial DDR5 6400 CSODIMM 3Crucial DDR5 6400 CSODIMM 3 With the new clock driver DIMMs, you will see it on the label along with CSODIMM/ CUDIMM. Here is the CSODIMM package label. Crucial DDR5 6400 CSODIMM 1Crucial DDR5 6400 CSODIMM 1 On the CUDIMM side, we do not have a normal DDR5 DIMM in the CMS stright-on, but here is the label side of a Micron ECC UDIMM. ASRock Rack AM5D4ID 2T BCM Crucial DDR5 ECC UDIMM 1ASRock Rack AM5D4ID 2T BCM Crucial DDR5 ECC UDIMM 1 Here is the Crucial CUDIMM front and back. Crucial DDR5 6400 CUDIMM 2Crucial DDR5 6400 CUDIMM 2 When we isolate the DIMM, we can again see the Montage clock driver in the center. Crucial DDR5 6400 CUDIMM 3Crucial DDR5 6400 CUDIMM 3 If you were thinking that the DDR5 RDIMMs used in servers have something similar there, you would be correct. Here is a shot from our Why DDR5 is Absolutely Necessary in Modern Servers piece: Micron DDR5 RDIMM RCD RambusMicron DDR5 RDIMM RCD Rambus Of course, the CUDIMM is also labeled, along with the fact that you need Intel Core Ultra Processors Series 2 or newer to use them. Crucial DDR5 6400 CUDIMM 1Crucial DDR5 6400 CUDIMM 1 Most folks will still use non-CUDIMMs. In fact, we showed some non-CUDIMM DDR5-6400 Crucial Pro DDR5 memory in this week's AMD Ryzen 7 9800X3D Launch article. Final Words Adding a clock driver for better clock integrity is nothing new. Servers have been doing something similar for years. Still, as we get to higher memory speeds, this is something we will see more of. One of the reasons UDIMMs historically have not had clock drivers is because it is an extra component that adds cost. In the DDR5 generation, the memory vendors are likely happy since they added the PMICs as well as in many cases the clock drivers. In the tug-o-war between memory modules and the CPUs and motherboards, the DDR5 memory vendors are winning extra components being placed on their modules. [INS::INS] * TAGS * crucial * CSODIMM * CUDIMM * Micron Facebook Twitter Pinterest Linkedin Email Print Copy URL Previous articleMikroTik CRS304-4XG-IN Review This is a Must-Have 10Gbase-T Switch Next articleTenda TEM2010F 8-port 2.5GbE and 2-port SFP Switch Review John Lee https://www.servethehome.com John Lee has been a programmer for decades and a STH reader since 2011. He has spent time in offices where servers are colocated with software engineers so he has an acute ear for low power and low noise servers. RELATED ARTICLESMORE FROM AUTHOR IKoolCore R2 Max Rear Three Quarter iKoolCore R2 Max Dual 10Gbase-T and 2.5GbE Fanless Mini PC Hands-on Beelink SER9 Web Cover Beelink SER9 AMD Ryzen AI 9 HX 370 Mini PC Review Khadas Mind Meteor Lake 11 Khadas Mind 2 Meteor Lake Edition Review 3 COMMENTS 1. yamamoto November 9, 2024 At 2:45 pm My understanding, it is Client Clock Driver (CKD), which doubles clock frequency by 2. For example, motherboard sends 3200 MHz (equivalent) clock to the memory module and CKD outputs 6400 MHz (equivalent) clock using PLL. 2. Techload Informatica November 10, 2024 At 11:41 am This is actually pretty interesting - I work in IT and didn't realize they were bringing server memory tech to consumer hardware now. Makes total sense though with how fast DDR5 is getting. Those comparison photos really help show the difference - that Montage clock driver chip is pretty obvious once you know what to look for! I had to laugh a bit at the "memory vendors are winning" comment at the end. Like, of course they're happy - they get to charge more for these fancy new modules with extra components. But I guess if we want those sweet DDR5-6400 speeds, we gotta pay to play. One thing I'm curious about though - they mention you need Intel Core Ultra Series 2 or newer. Wonder how much of a performance difference these CUDIMMs actually make in real-world use compared to regular DDR5? Would love to see some benchmarks comparing them. Pretty solid technical write-up though. Nice to see server tech trickling down to consumer hardware as speeds keep pushing higher. 3. Wayne November 10, 2024 At 3:42 pm Yamamoto, sorry, it's just a clock repeater (with a pll), even has a bypass mode for those ddr phys that dont support the new clock termination requirements.This article is kind of dumb, like AI wrote it. The idea is to potentially reduce cock jitter at the dram, for those phys that can take advantage of the pll modes, so there is more overall s/h margin for clock dqs /clock dq ac timing requirements. The good thing about ckdimmn isn't necessarily the ckd buffer, but that the higher frequencies require better raw cards. The raw cards in turn have more layers, better materials, and a bit bigger cost -which yield higher supported bandwidths. LEAVE A REPLY [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] Please enter your comment! [ ] Please enter your name here [ ] You have entered an incorrect email address! Please enter your email address here [ ] [ ]Save my name, email, and website in this browser for the next time I comment. [ ]Sign me up for the STH newsletter! [Post Comment] [ ] [ ] [ ] [ ] [ ] [ ] [ ] D[ ] This site uses Akismet to reduce spam. Learn how your comment data is processed. Newsletter Get the best of STH delivered weekly to your inbox. 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