Patriot Gamer 2 Series Division 2 Edition DDR3 4 GB PC3-10666 1333MHz 9-9-9-24 for Intel P67 Using Core i5 Core i7 Memory Modules PGD34G1333ELK Equipped with an extruded aluminum heat shields to provide improved cooling Extreme Performance PC3-10666 (1333MHz) with Enhanced Latency (9-9-9-24) XMP Ready Voltage: 1.65V 100% Tested and Verified on Intel P67 platform using Core i5 and Core i7 CPUs Lifetime Warranty and FREE Technical Support