My operating system is Windows 7/64 with an ASUS M4A785TD-V EVO motherboard. The PC Specialist build came with 2x2GB Corsair XMS3 DHX 1333M DDR3 Dual Channel memory. I want to increase to 8GB. Buying the same model RAM would cost about £60. To install 2x2GB Crucial CT2KIT25664BA1339 • DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.5V • 256Meg x 64(for instance, via their Crucial Scan) would be about £37. Why should I choose the Corsair (or not)? My main use is Photoshop work and a little video editing, never gaming. Thanks.