Originally Posted by shattered.likeness
Hi guys, first post here, but needed some help, and see that you guys are more active on the AMD front than my normal forums.
Right now my Phenom II 720BE is sitting at 3.7GHz, but I can't seem to get Prime95 ro run for over 5 hours. I am aiming for at least an 8 hour Prime run (Blend) because I remember reading somewhere that at around 8 hours is when the either the CPU-NB gets tested or the memory (can't remember which). So, now I come to you guys to see if I might be able to get some help getting that last bit of stablity I"m looking for, before thinking about taking the CPU clock higher. My current BIOS Settings for my MSI 790FX-GD70 (BIOS 1.54B4) are as follows:
AMD Cool & Quiet: Disabled
CPU FSB Frequency: 200
CPU Ratio: x18.5 (3700MHz)
CPU-NB Ratio: x13 (2600MHz)
EC Firmware: Normal
Advanced Clock Calibration: Disabled
DRAM Frequency: 1333MHz
Timing Mode: Both
Timings: 6-6-6-24 (everything else on auto)
HT Link: x10 (200MHz)
Voltages are in the order listed on the BIOS screen
CPU VDD Voltage: 1.475
CPU-NB VDD Voltage: Auto
CPU Voltage: 1.555
CPU-NB Voltage: 1.350
CPU PLL Voltage: Auto
CPU DDR-PHY Voltage: Auto
DRAM Voltage: 1.94
DDR Vref Voltage: Auto
NB Voltage: 1.250Aut
NB PCI-E Voltage: Auto
NB PCI-E I/O Voltage: Auto
HT Link Voltage: Auto
SB Voltage: Auto
Spread Spectrum: Disabled
By increasing the CPU Voltage to 1.555, I was able to get Prime (blend) to run for 5 hours, but I want to be sure that I won't have any stability issues from running @ 3.7GHz before trying to push it any farther. Anyone have any tips on getting 8 hour Blend stable? Or am I just wasting my time, and should move on to trying to get 3.8GHz now?
Thanks for any help!
have you tried lowering the NB and RAM frequency to see if its the cpu thats causing the instability?
if the cpu is stable i would guess its the CPU-NB voltage or the NB voltage that is to low to run it stable.
at what FFT size does prime95 crash? (check the results.txt in the p95 folder)
the blend test changes every 2 FFT sizes from small to big FFT sizes and as far as i know big sizes put more stress on the NB/RAM and small sizes on the CPU.
but that does not necessarily mean that if you get a crash on small sizes that its the cpu or the other way around