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OS dependant overclock???

WildW

Senior member
Not quite sure which board to post this on, I haven't quite made sense of which bit isn't happy.

Basically, my PC was overclocked quite happily for several months when I was running XP, but now that I've changed to Vista I've had to reduce my overclock or I run into problems.

System:

Gigabyte GA-M52S-S3P ( http://www.gigabyte.com.tw/Pro...ew.aspx?ProductID=2567 )
Athlon X2 BE2400 (Brisbane core, 2.3GHz, 11.5 x 200)
Asus built Radeon 4670 512MB
3GB DDR2-800
Hiper 625W PSU


Under XP I was running at 248MHz FSB, giving me 2.85GHz, or thereabouts. Memory freq is divided down so it's barely overclocked (206MHz rather than 200). It ran like that for a good few months without issues. Prime95 and Memtest stable and all that fun stuff. Temps are nice and low - CPU and motherboard never over around 40C. Added some extra cooling to the chipset too.

Since moving to Vista I've seen the graphics card fall over quite often. Screen goes black, then recovers, Windows pops up a message that the GPU recovered/restarted. Sometimes this will happen over and over and then Windows goes all BSOD. Graphics card is running at stock speed, and downclocks from 750MHz to 200MHz when on the desktop anyway. And yes, it dies when just on the desktop rather than when gaming. No temperature issues either, it just dies.

I've reduced my overclock to 240 FSB, and the issue has disappeared. Tried pushing it back up again but the problem returned. I'm just slightly confused as to why the FSB should upset the graphics card - I thought PCI-express frequency was entirely independant of that? Should the FSB setting have any effect on the interface between processor and graphics card? Is it more likely to be something else? Boost chipset voltage a bit more maybe? Any thoughts?

I haven't lost too much - a mere 100MHz from my CPU I guess. . . it's just. . . odd.
 
I don't know as much about AMD motherboards, but on most Intel chipset boards you have to explicitly lock the PCI-e frequency or it will rise with your CPU overclock.
 
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