6800GT/FSB speed problem

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tomsega

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I've got a bizzare problem with my new graphics card.

When playing games at 198fsb, the card runs fine - No problems at all. However, at my computers native 200fsb, I get crashes, and often the blue screen of death. This problem certainly ISN'T a result of the graphics card getting hot, and I'm pretty sure that the CPU's max temp of 52c shouldn't be causing this. My power supply is fine, and it's definately NOT a software/driver issue.

I find that if I run my memory at 83% (333mhz), everything is okay. However, the memory always ran fine at full speed with my old 6800LE. Memtest detects no errors even at 400mhz.

Any ideas?
 
So, the old card ran fine ... but the new card does not.

Replace the new card with the old one then. ;)
 
Er, well I don't have the old card anymore.

The fact of the matter is that my PC works perfectly at 198fsb, but not when at 200fsb. And the only new component in it is the 6800gt - which can be really pushed and overclocked at 198, but seems to crash everything when the FSB is only 1% higher!

It would be nice to try altering my memory voltage - but my BIOS doesn't give me the option.

Motherboards automatically know how large the PSU they are powered by is, don't they?
 
I can only point my finger at the power supply. The 6800GT is a very power hungry card, I think on the box it says "minimum psu requirement 400w" which was pretty darn high when they 1st come out!
 
Just noticed you've overclocked your 6800GT quite abit (looking at your sig), the standard speeds are 350Mhz/500Mhz (1000Mhz effective) and you have it 400Mhz/550Mhz (1100Mhz effective) . You might want to take the core to about 370Mhz, 400 seems abit high to me. Just try it for abit, see if it helps.
 
Reefsmoka said:
Just noticed you've overclocked your 6800GT quite abit
Click to expand...

I get the same problem when it isn't overclocked, I'm afraid. In fact I'm only really overclocking it so much to make myself feel better about the CPU and Memory being reduced to 2.18ghz and 394mhz!

Since installing the graphics card, however, my BIOS suddenly started to think the RAM should run at 333 instead of 400, and indeed I get no errors when the memory is at that speed. So, either the memory is pants, or the BIOS isn't recognising that I've installed a new PSU and giving it enough power.

So I think I'm going to get some smarter Corsair platinum and see what that does...
 
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