{"product_id":"samsung-32gb-ddr5-5600-rdimm-m321r4ga0pb0-cwm","title":"Samsung 32GB 5600MHz DDR5 PC5-44800 ECC Registered CL46 288-Pin DIMM 1.1V Single Rank x4 Memory Module - M321R4GA0PB0-CWM","description":"\u003cp\u003eThe Samsung M321R4GA0PB0-CWM is a 32GB DDR5-5600 registered DIMM for servers. It is single rank with x4 chips, runs at 1.1V, and has 288 pins. The label reads 32GB 1Rx4 PC5-44800B-R, and sellers often add EC8.\u003c\/p\u003e\n\u003ch2\u003eIs CL46 slow?\u003c\/h2\u003e\n\u003cp\u003eA CL number counts clock cycles, and DDR5 clocks tick faster than DDR4 clocks. So CL46 sounds slow but is not. Multiply the CL by the clock time to get the real delay in nanoseconds.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModule type\u003c\/th\u003e\n\u003cth\u003eData rate\u003c\/th\u003e\n\u003cth\u003eCL\u003c\/th\u003e\n\u003cth\u003eDelay to first data\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDDR4-3200\u003c\/th\u003e\n\u003ctd\u003e3200 MT\/s\u003c\/td\u003e\n\u003ctd\u003e22\u003c\/td\u003e\n\u003ctd\u003e13.75 ns\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDDR5-4800\u003c\/th\u003e\n\u003ctd\u003e4800 MT\/s\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e16.7 ns\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eDDR5-5600 (this module)\u003c\/th\u003e\n\u003ctd\u003e5600 MT\/s\u003c\/td\u003e\n\u003ctd\u003e46\u003c\/td\u003e\n\u003ctd\u003e16.4 ns\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eThis module has about the same first-data delay as DDR5-4800 and 17% more bandwidth: 44.8 GB\/s against 38.4 GB\/s. The timing is 46-45-45 at 1.1V.\u003c\/p\u003e\n\u003ch2\u003eOne module, several suffixes\u003c\/h2\u003e\n\u003cp\u003eSellers also list versions of this Samsung module that add two letters, such as CWMXJ, CWMJH, CWMKJ, and CWMKH. They show the same size, rank, and speed. The part number on your label is the one to match.\u003c\/p\u003e\n\u003ch2\u003eHow it is built\u003c\/h2\u003e\n\u003cp\u003eThe module has one rank of x4 chips. Each DDR5 module has two 32-bit sub-channels, and ECC adds 8 check bits to each one. That is the EC8 tag. Each sub-channel uses ten x4 chips, so the module carries twenty. Memory.net lists 16Gb chips, which is how 32GB adds up.\u003c\/p\u003e\n\u003ch2\u003eWhat to match\u003c\/h2\u003e\n\u003cp\u003eA server that takes this module has to support DDR5 RDIMMs at 5600 MT\/s. If the CPU tops out at 4800, the module runs at 4800. It can't share a server with unbuffered DIMMs, and a desktop PC can't use it. Sixteen modules give 512GB.\u003c\/p\u003e\n\u003ch2\u003eQuick answers\u003c\/h2\u003e\n\u003ch3\u003eIs it single or dual rank?\u003c\/h3\u003e\n\u003cp\u003eSingle rank. The 1R in 1Rx4 means one rank.\u003c\/p\u003e\n\u003ch3\u003eDoes it work in a desktop?\u003c\/h3\u003e\n\u003cp\u003eNo. Registered ECC modules need a server board.\u003c\/p\u003e\n\u003ch3\u003eWhat does CWM mean?\u003c\/h3\u003e\n\u003cp\u003eIt is the speed suffix at the end of the Samsung part number. Sellers list it as DDR5-5600 with 46-45-45 timing.\u003c\/p\u003e\n\u003ch3\u003eCan it run slower?\u003c\/h3\u003e\n\u003cp\u003eYes. In a server limited to DDR5-4800, the module drops to 4800 MT\/s and runs at that speed.\u003c\/p\u003e\n\u003ch2\u003eM321R4GA0PB0-CWM specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSamsung\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart number\u003c\/th\u003e\n\u003ctd\u003eM321R4GA0PB0-CWM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCapacity\u003c\/th\u003e\n\u003ctd\u003e32GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eType\u003c\/th\u003e\n\u003ctd\u003eDDR5 RDIMM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSpeed\u003c\/th\u003e\n\u003ctd\u003e5600 MT\/s (PC5-44800)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBandwidth\u003c\/th\u003e\n\u003ctd\u003e44.8 GB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eRank\u003c\/th\u003e\n\u003ctd\u003e1Rx4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eTiming\u003c\/th\u003e\n\u003ctd\u003eCL46 (46-45-45)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eError check\u003c\/th\u003e\n\u003ctd\u003eECC (EC8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e1.1V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePins\u003c\/th\u003e\n\u003ctd\u003e288\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Samsung","offers":[{"title":"Default Title","offer_id":62810656113011,"sku":"M321R4GA0PB0-CWM","price":1745.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0992\/9546\/1747\/files\/dm_m321r4ga0pb0-cwm_1.jpg?v=1778010524","url":"https:\/\/cpurepublic.com\/products\/samsung-32gb-ddr5-5600-rdimm-m321r4ga0pb0-cwm","provider":"CPU Republic LLC","version":"1.0","type":"link"}