Corsair WS DDR5 RDIMM: The Complete Guide

The release says Corsair was “entering the DDR5 Workstation market with the introduction of a range of WS DDR5 RDIMM memory kits” 1. Corsair’s US store lists ten WS DDR5 RDIMM kits 2. Six have part numbers ending in C40 or C32, and four end in Z40 2. The C-suffix pages checked list Memory Compatibility “Intel W790 or Newer” 345. The 64GB 6000MT/s Z40 page lists “AMD TRX50 and WRX90” 6, and the 256GB Z40 page lists “AMD TRX50,AMD WRX90,Intel W790” 7.

The release’s headline is “CORSAIR enters the DDR5 Workstation Market with the release of WS DDR5 RDIMM ECC memory kits”, under a Milpitas, CA dateline 1. It names media editing, 3D rendering and AI training as uses, says the kits were “available immediately”, and quotes no named person 1.

The release says “CORSAIR has integrated a PGS layer, efficiently distributing heat away from the Power Management Integrated Circuit (PMIC) and across the RDIMMs” 1. The explainer lists “Heat Spreader | PGS” 8. The product pages checked give no module height 3456.

All four pages list SPD Voltage 1.1V and SPD Speed 4800MHz 3456. The release lists 4x16GB, 8x16GB, 4x32GB and 8x32GB kits 1.

The explainer says the chips “are carefully screened for best performance” without naming whose 8. The release and the four product pages checked name no DRAM maker either 13456. The release says the RDIMMs support Error Correction Code (ECC) 1.

The release says the kits “are compatible with the latest 4th Gen Intel Xeon and AMD Ryzen Threadripper 7000 processors” and support “Intel XMP 3.0 and AMD EXPO” 1. The explainer says the chips are “available in both Intel and AMD varieties” and lists Intel W790 with Xeon W-3400 or W-2400, AMD TRX50 with Threadripper PRO 7000, and AMD WRX90 with Threadripper PRO 7000/WX 8. The C-suffix pages checked name only ASUS and ASRock W790 boards; both Z40 pages checked name only TRX50 and WRX90 boards from ASUS and Gigabyte 34567.

The release has an “Availability, Warranty, and Pricing” heading but states no price 1. When checked, the US pages showed $1,174.99 for the 64GB 6000MT/s Z40 kit and $1,207.99 for the 64GB 5600MT/s C40 kit 64; the 256GB C40 page showed no price, though its page data gave $4,866.99 5. These are point-in-time store prices, not launch prices.

The product pages say the memory “offers performance beyond the JEDEC specifications” 3456. The release says the range is “backed by a limited lifetime warranty” 1, and each product page checked carries the heading “LIMITED LIFETIME WARRANTY” 3456.

The release frames the launch as Corsair entering the DDR5 workstation market 1. The explainer contrasts RDIMM with “its simpler, Unbuffered DIMM (UDIMM) cousin”, saying RDIMM “employs a register between the system’s memory controller and the RAM modules” 8. None of the Corsair sources checked names a successor 18.

The US store lists two kits titled “WS DDR5 ECC RDIMM 64GB (4 x 16GB) DDR5 DRAM Up To 6000MT/s CL40 Memory Kit”, CMA64GX5M4B6000C40 and CMA64GX5M4B6000Z40, at the same price ($1,174.99). The 64GB 5600MT/s pair also shares a title and a price ($1,207.99), and the 128GB (4 x 32GB) and 256GB pairs share titles; the list shows no price for those 2. On the Z40 page the Performance Profile reads “AMD EXPO & Intel XMP” and Memory Compatibility “AMD TRX50 and WRX90” 6; on the C-suffix pages checked they read “Intel XMP” and “Intel W790 or Newer” 345. The 256GB Z40 page adds “Intel W790” to its Memory Compatibility but lists only AMD boards 7. Yet every page checked, Intel or AMD, carries the same headings “INTEL® XMP 3.0 COMPATIBLE” and “AMD EXPO™ COMPATIBLE” 3456. The explainer also lists “PMIC Type | Standard”, while the four product pages list PMIC Type “Overclock PMIC” 83456. The explainer says the chips come “in both Intel and AMD varieties” 8, but none of the Corsair pages checked says how the part-number endings map to platforms, why both versions carry both compatibility headings, or why the PMIC types differ 8236.