{"product_id":"dell-64gb-ddr4-2666-lrdimm-memory-30knj","title":"Dell 64GB 2666MHz DDR4 PC4-21300 ECC Registered CL19 288-Pin Load Reduced DIMM 1.2V Quad Rank x4 Memory Module - 30KNJ","description":"\u003cp\u003eDell part 30KNJ is a 64GB DDR4 server memory module. It runs at 2666 MT\/s, uses 288 pins, and needs 1.2V. It is an LRDIMM with a quad-rank, x4 layout, so the sticker reads 64GB 4Rx4 PC4-2666V-L.\u003c\/p\u003e\n\u003ch2\u003eReading the sticker\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e64GB:\u003c\/strong\u003e the size of the module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4Rx4:\u003c\/strong\u003e four ranks of x4 memory chips (Dell sometimes writes 4DRx4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePC4-2666V:\u003c\/strong\u003e DDR4 at 2666 MT\/s, which moves 21.3 GB\/s per module\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL:\u003c\/strong\u003e load-reduced, meaning data buffer chips sit on the module\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy LRDIMM matters\u003c\/h2\u003e\n\u003cp\u003eLoad-reduced modules let a server hold more memory per channel. The buffer chips hide the load of all those memory chips from the memory controller. The trade is a little extra latency and some added power.\u003c\/p\u003e\n\u003cp\u003eAn LRDIMM can't share a server with plain RDIMMs. Pick one type and stay with it. Match the speed too, because the whole system runs at its slowest module or at the CPU limit. Registered ECC memory also won't work in a desktop PC.\u003c\/p\u003e\n\u003ch2\u003eHow much memory fits\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSlots\u003c\/th\u003e\n\u003cth\u003eModules of 30KNJ\u003c\/th\u003e\n\u003cth\u003eTotal memory\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e8\u003c\/th\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003ctd\u003e512GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e12\u003c\/th\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003ctd\u003e768GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e16\u003c\/th\u003e\n\u003ctd\u003e16\u003c\/td\u003e\n\u003ctd\u003e1,024GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e24\u003c\/th\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003ctd\u003e1,536GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eA 64GB module uses one slot, the same as a 32GB module, so it doubles what each slot holds. Dell's own 64GB 4Rx4 LRDIMM at this speed, part A9781930, lists the PowerEdge R740xd, R840, R940, and T640. Check your server's memory guide for the slot layout and speed limits.\u003c\/p\u003e\n\u003ch2\u003eQuick answers\u003c\/h2\u003e\n\u003ch3\u003eIs 30KNJ the same as 030KNJ?\u003c\/h3\u003e\n\u003cp\u003eYes. Dell often prints a leading zero on labels. It is one part.\u003c\/p\u003e\n\u003ch3\u003eWhat does 4Rx4 mean?\u003c\/h3\u003e\n\u003cp\u003eMore ranks put more memory chips on one module, which raises capacity. Four ranks of x4 chips is how a 64GB module is built.\u003c\/p\u003e\n\u003ch3\u003eWhat does CL19 mean?\u003c\/h3\u003e\n\u003cp\u003eIt is the CAS latency, the number of clock cycles between a read command and the first data. Lower is quicker at the same speed.\u003c\/p\u003e\n\u003ch3\u003eWill it run faster than 2666?\u003c\/h3\u003e\n\u003cp\u003eNo. The module is rated for 2666 MT\/s. A faster CPU won't push it past that.\u003c\/p\u003e\n\u003ch2\u003e30KNJ specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eDell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePart number\u003c\/th\u003e\n\u003ctd\u003e30KNJ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCapacity\u003c\/th\u003e\n\u003ctd\u003e64GB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eType\u003c\/th\u003e\n\u003ctd\u003eDDR4 LRDIMM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eSpeed\u003c\/th\u003e\n\u003ctd\u003e2666 MT\/s (PC4-21300)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eRank\u003c\/th\u003e\n\u003ctd\u003e4Rx4 (quad rank, x4)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eError check\u003c\/th\u003e\n\u003ctd\u003eECC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCAS latency\u003c\/th\u003e\n\u003ctd\u003eCL19\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e1.2V\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\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBandwidth\u003c\/th\u003e\n\u003ctd\u003e21.3 GB\/s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Dell","offers":[{"title":"Default Title","offer_id":62810966294899,"sku":"30KNJ","price":1010.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0992\/9546\/1747\/files\/30knj.jpg?v=1778020341","url":"https:\/\/cpurepublic.com\/products\/dell-64gb-ddr4-2666-lrdimm-memory-30knj","provider":"CPU Republic LLC","version":"1.0","type":"link"}