8GB 2X4GB RAM Memory for Gigabyte GA-H Series GA-H55M-S2H (rev. 1.0) DDR3 DIMM 240pin PC3-6400 800MHz Black Diamond Memory Module Upgrade Brand new 240pin DDR3 DIMM 800MHz Memory Low density 8GB memory kit (2 sticks of 4GBmemory module) modules 100% compatible garrantee for Gigabyte GA-H Series GA-H55M-S2H (rev. 1.0) 100% pre-tested on Gigabyte system to ensure functionality Lifetime warranty