I just bought a used e6420 cpu. It overclocks so far to 3.5ghz but something strange has occured. When I overclock my systems ram only or with ram and the cpu overclocked together my video card acts goofy. It's fine with just the cpu overclocked but once I touch the systems ram I start getting VPU recovery errors in window but once I set my systems ram back to defaults I'm fine. The ram is the key. My video card function fine no matter what I do aslong as I don't touch my ram. I tested my ram with memtest I get zero errors. I'm puzzeled here. With my other cpu's I never had this problem and the ram being overclocked doesn't seem to effect the cpu overclocking just the video card stability? Help if you have any idea what the problem is.