Memtest does not really test the CPU, if you get an error in test 1/2/3 or 4 it means the sytem is unstable, if you get an error in a higher test it means the memory isn't stable.StevenG said:at college at the minute got it running at 2.9 running memtest to see if my memory is ok. this should also test the cpu? as it uses 100%???