Hi Guys,
I know several other people have posted similar threads to this one, but none of the suggestions seem to resolve my problem.
PROBLEM:
Overclocking the FSB on my P5B above 360 will automatically drop the PCI-e bus width from 16x to 1x
SUGGESTED/ATTEMPTED SOLUTIONS:
- Increase PCI-e frequency gradually until 16x Bus width is restored (gone from 100 - 120 without any effect)
- Reduce multiplier to either 8x or 7x but increase FSB above 400 because apparently some instability can occur on P5B's with the FSB range 360-400.
(Have tried 8x ...lots, and can't seem to post, tried 7x 401, 405, 410, 420 and lastly 425 (425 would not post, but the others will post and not fix the problem)) I have tried this in combination with adjusting PCI-e frequency up to 120 and it doesn't resolve the issue.
- Increase South Bridge voltage to 1.7 and see if this resolves the issue - doesn't seem to
- Set overclock and close down without posting, leave power out for 30 seconds and reboot. - no difference
- I've heard some suggestions as extreme as setting the overclock, removing gfx card?!?! powering on, and then off. Then re-inserting gfx card .... not tried this one, and not really likely too to be honest.
Has anyone got any further suggestions I could try? or even suggestions as to the cause of such an issue? I've thought to myself it could be the PSU underpowered, and maybe the power put through the PCI-e bus is not high enough to hold 16x and it therefore reverts to 1x.
Many people seem to disagree with this as a cause, but I'm running low on other causes.
A work colleague suggested that I try a different gfx card and see if this helps (could be a factor in the power consumption) but I don't have another PCI-e card I can use to test I'm afraid.
Any help would be hugely appreciated, as I know the CPU/Mobo/RAM can handle 360+ on 9x multiplier as I can run higher with no problems, but I'm obviously not prepared to drop to 1x PCI-e to acheive this.