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Max stable overclock acheived with 6600gt.

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I manage 580/1160 on a Leadtek 6600GT AGP on stock cooling; depending on the game I have to scale back a wee bit to avoid any artifacting, but it's fine most of the time.
 
I know this thread is a month old now, but I just installed my new AGP XFX 6600GT with 256mb so I thought I'd chime in.

I was able to get to 582/1160 with stock AGP voltage and cooling. I bumped my AGP voltage up to 1.65, and was able to get the memory to 1170, but then I couldn't get the core to 580 anymore. Since there was no true gain, I brought the voltage back to stock.

I just installed 3dmark05 and ran the tests at the default settings. I got 4229.

 
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