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OC'n my 8800GX: Safe numbers?

post #1 of 3
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I just started OC'n my gfx card, an MSI 8800GTX. Defaults are:
Core: 576
Memory: 1350
Shader: 900

What is the safe limit? Like for example in cpu's such as an e6600, we can safely goto 3 ghz owith aftermarket air instead of doin it in small increments. How far do i go with an 8800? What game/app should i use to check for artifacts? How long do i check it for artifacts? Im a total noob at OCn graphics cards! Your help will be appreciated highly! Thanks guys.
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Nessie
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post #2 of 3
Quote:
Originally Posted by Sanad View Post
I just started OC'n my gfx card, an MSI 8800GTX. Defaults are:
Core: 576
Memory: 1350
Shader: 900

What is the safe limit? Like for example in cpu's such as an e6600, we can safely goto 3 ghz owith aftermarket air instead of doin it in small increments. How far do i go with an 8800? What game/app should i use to check for artifacts? How long do i check it for artifacts? Im a total noob at OCn graphics cards! Your help will be appreciated highly! Thanks guys.

You have the shader and mem speeds reversed, the mem is 900mhz GDDR3/1800mhz effective

Most GTX's will do in the 620mhz range on the core and 2000mhz on the mem.
Shader speed IDK, sold my GTX before you could change the shader speed.

You'll need Rivatuner for fan speed adjustment, also has many other goodies, look in my sig at How do I see in game temps.
Also get ATItool, you can OC with it and scan for artifacts.

Take your time 10-15mhz at a time and scan for artifacts for about ten minutes. Should you see artifacts then lower the speed 10mhz and retest. Monitor temps, < 85°c is good, less even better.

Here is a chart of actual core speeds, Rivatuner has a graph that display actual speeds, it's under hardware monitoring.

BTW lose Ntune if thats what you're using.

Also I see you have a P5B, keep an eye on your PCI-E linkwidth when you oc your proc.
It might drop to x1 after an FSB increase, if that happens you have a couple of options.
Set your NB voltage to 1.45 and recheck or adjust your PCI-E up until it returns to the full x16. Both methods have worked for me.

Good Luck

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Mighty-iTX
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post #3 of 3
The "safe" limit, IMO, is whatever frequency you can get your core/mem/shader clocks up to without artifacting - and within a safe temp limit (I like to stay under 80C in most cases).

I use RivaTuner to overclock my card (because you can OC the core, mem, and shaders), and ATItool to stress test it. When in ATItool, I set the artifact scanning at maximum sensitivity and run it for at least 10 minutes.
    
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