AGP Lock issue when overclock

[NervousNovice2]

I have a Asus A7V600 mobo, 2500+ XP cpu, DDR400 ram, 9200SE graphic card.

I cranked the CPU core up to 11x200 at 1.75V. It got into Windows but I see some pink lines on my screen. How come? Is that something related to my graphic card via something called AGP lock? What is AGP lock? By the way, my system reboot 5 mins after I ran the Burn-in. Haha.

 

[CheesePoofs]

the AGP lock keeps the agp bus frequency at its default value (66-67mhz). Without it enabled, the agp bus frequency will increase when you increase the FSB, which is not a good thing. It can cause lots of issues.

 

[NervousNovice2]

Oh I guess it's unlock and keep increasing. This mobo doesn't have much overclocking features. It basically has nothing. It jumped up to 2200mhz in 1 step. LOL. How does the AGP bus increase with FSB? Is there a formula for it?

 

[Lonyo]

Originally posted by: NervousNovice2
Oh I guess it's unlock and keep increasing. This mobo doesn't have much overclocking features. It basically has nothing. It jumped up to 2200mhz in 1 step. LOL. How does the AGP bus increase with FSB? Is there a formula for it?

Normally it's worked out as a ratio, either 4:2:1 (FSB:AGP😛CI), 5:2:1 or 6:2:1 I believe.
If you have 133MHz FSB and 4:2:1, then FSB is 133MHz, AGP is 66MHz and PCI is 33MHz.
If you have a 166MHz FSB, you use 5:2:1 and get 166:66:33 and with 200MHz FSB you *may* have 6:2:1 and get 200:66:33.
When you overclock, say from 166MHz to 180MHz, your ratio (5:2:1) would stay the same, so AGP would become 2/5 of 180, or 72MHz, which is out of spec.

 

[NervousNovice2]

Must the AGP run at 66Mhz?