It turns out that the 4G dimm was corrupted all along.
Replaced it with a brand new one and it's all good now.

Replaced it with a brand new one and it's all good now.
My Computer
- OS
- Win 7 Enterprise x64 sp1 (Retail) 1.5 years old
- CPU
- Intel i5-760 (@stock)
- Motherboard
- Intel p55wb
- Memory
- Kingston 2x2GB + 1x4GB (KVR1333D3N9)
- Graphics Card(s)
- Sapphire 6870 (@stock)
- Sound Card
- onboard
- Monitor(s) Displays
- Samsung lcd 32'' D550
- Hard Drives
- WD10EARS Green
- PSU
- Hec 500vn 2dx
- Case
- Compucase 6k31
- Cooling
- Scythe Big Shuriken