Corsair CMX4GX3M2A1600C9 XMS3 4GB (2x2GB) DDR3 1600 Mhz CL9 Performance Desktop Memory Kit

Title : Corsair CMX4GX3M2A1600C9 XMS3 4GB (2x2GB) DDR3 1600 Mhz CL9 Performance Desktop Memory Kit
ASIN : B002LE8D2A
Description : Memory
Features :

• Storage Capacity:4 GB : 2 x 2 GB
• Upgrade Type:Generic

List Price : £44.99
Price : £37.99
Saved Price : £7.00

category: Products
brand: Corsair
Item Page Detail URL : link
Rating : 4.7
Review : Cheap but reliable
I've used Corsair XMS RAM in several computers now and never had a problem - it's good, reliable stuff. I'm not a big over-clocker so I can't say how much extra performance you can get out of it but it's rock solid at it's rated speeds.
Even though these sticks are rated at 1.65v, they run fine at 1.5v (at 1333Mhz - I haven't tried 1600) so they're fully compatible with Intel's Sandy Bridge architecture.

Fully Recommended ;p