SNP8WKDYC/32G DELL MEMORY MODULE 32GB DDR4 2933MHz PC4-23400 ECC 1.2V 288 PINS CL21 RDIMM POWEREDGE C4140 C6420 FC640 M640 M640 VRTX MX740C MX840C R640 R740 R740XD AA579531 SNP8WKDYC/32G