HP 840759-191 COMP 64GB DDR4-2666MHZ ECC QRX4 RDIMMAddOn 64GB DDR4 SDRAM Memory Module 64 GB (1 x 64GB) DDR4 2666 PC4 21300 DDR4 SDRAM 2666 MHz Quadruple rank Memory 1. 20 V ECC 288 pin LRDIMM Lifetime Warranty VPN: 840759 191 AM SKU: RSC889041 UPC: 821456133841 64 GB of memory can produce approx. 10K MIPS and as a result, your system gets more room to run complex apps. 2666 MHz memory speed for great multitasking capability DDR4 2666 PC4 21300 interface multiplexes 2 bit data from memory cell and I O