Phenom II x4 920 Prime95 fails

Phenom II X4 at 3.36ghz
HT and NB at 1.9ghz
ddr2-800 ram is at 960mhz with 5-5-5-18
The memory
http://www.newegg.com/Product/Prod [...] 6820146731
People who reviewed say its good overclocking ram.
Full load the CPU temp hovered around 58-59C (safe?)


Core 1:
FATAL ERROR: Rounding was 0.4990234375, expected less than 0.4
Hardware failure detected, consult stress.txt file.
Core 4:
FATAL ERROR: Rounding was 0.498046875, expected less than 0.4
Hardware failure detected, consult stress.txt file.
Core 3:
FATAL ERROR: Rounding was 0.5, expected less than 0.4
Hardware failure detected, consult stress.txt file.
Core 2:
Self-test 1024K passed!
Still going

Odd thing is, only three of the four cores failed so far.
Does that mean the cpu is bad but the ram is good? If its a memory problem doesnt it all fail?
BTW, core 1 failed @6minutes, core 4@7 minutes, core 3@9 minutes.

What does this mean? All voltages are the same.

I read Hypert must be below Northbridge. Try 2400 or so on Northbridge and 2000MHz on Hyper. Worked for me with 9850 BE and benchmarks went up.