Corsair TW2X4G6400C4PRO XMS PRO 4GB 2 X 2 GB PC2-6400 800MHz 240-Pin DDR2 Dual Channel Memory Kit As part of Corsair's XMS ProSeries, this TWIN2X4G6400C4PRO includes the high-efficiency aluminum XMS heatsink, and 24 activity LED's that show the level of memory activity on each bank 100% tested at 800MHz in high performance DDR2 motherboards like the 780i NVIDIA Chipset Tested at 800MHz latency settings of 4-4-4-12 at 2.1V Online 24/7 Customer Support available at www.asktheramguy.com for your convenience and questions Lifetime Warranty