Unfortunately it seems to be causing major instability, it crashes after 5 - 10 hours of operation. Sometimes its a blue screen with a memory reference error or other times it just hangs. It even crashed when running windows memory diagnostic tool. I took my old sticks and left just my new ones in there and ran the test again with no problems.
Is it a problem with Windows or the motherboard, I did reset the CMOS every time changed the configuration. Maybe its the DIMM 2 & 4 slots on my motherboard I don't know.
My system specs are as follows:-
Motherboard - Abit IN9 32X-MAX Wi-Fi
CPU - Intel Core 2 Extreme QX6700
GPU - Ponit of View GeForce 8800GTX
RAM - 4x 1024mb pc-6400 OZC Platinum rev-2
OS - Windows Vista Home Premium 32-bit
Any help would be appreciated.