. Hyper X HX318C10FWK2/8 is a kit of two 512M x 64-bit (4GB) DDR3-1866 CL10 SDRAM (Synchronous DRAM) 1 Rx 8 memory modules based on eight 512M x 8-bit DDR3 FBGA components per module. Total kit capacity is 8GB. Each module kit has been tested to run at DDR3-1866 at a low latency timing of 10-11-10 at 1.5V..