AGP Question When Overclocking

[Tincup]

Just wondering how overclocking the CPU affects the AGP bus speed using these ratios; 3:3:1 / 4:3:1 / 4:4:1. I would guess it depends on the FSB...so let's use an FSB of 120MHz...or whatever you would like to use to explain this.
I don't want to burn up my video card (Hercules GeForce 2 GTS Ultra) in the AGP slot!

Thanks for your help!

 

[AndyHui]

Depends what chipset you are using.

If you are using a BX chipset (which I don't think you are), then it does not provide FSB 1/2 mutliplier....so if you were to use an FSB of 120MHz, the best the BX can do it 2/3, so that's 80Mhz....quite high and probably not a comfortable speed to run at.

The VIA chipsets and the i815(E/P) chipsets provide 1/2 multipliers. Depending on your motherboard (you haven't provided any details), it may switch from 2/3 to 1/2, giving you an AGP speed of 60MHz.

Strictly speaking, 80MHz AGP should be OK for GeForce cards....they have been known to withstand speeds of 100MHz AGP, so I wouldn't be too worried. Just as long as the FSB AGP ratio is not 1:1.

Edit: read your other post....I think the SA6R has manual mutliplier settings for the AGP FSB ratio....1:1, 2:3, 1:2. At 120MHz FSB, it will kind of underperform at 60MHz AGP....probably best to stick to the 2:3 setting unless you find that your system is unstable.