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What is AGP/PCI frequency?

post #1 of 11
Thread Starter 
What is AGP/PCI frequency? What it does?
It gets higher when i overclock my pc, can it be dangerous if it gets too high? I have it 33.3 on stock.
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post #2 of 11
Yes, you can even have data corruption. Lock it at 66mhz/33mhz.
post #3 of 11
its kinda like the rpms of a car. if you go to fast for to long you blow the engine. kinda the same for mobo agp/pci frenceys

you system will most likely crash before it blows up
post #4 of 11
Thread Starter 
Well.. i cant lock it ( too crap mobo ).
But i do wanna do some overclocking, should i just look it wont get over 66 mhz or i shouldn't oc at all?
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post #5 of 11
is there anything about asynchronize or synchronize in the bios?
post #6 of 11
Your BIOS might also offer you the option of adjusting the ratio of PCI/AGP bus to FSB. That would allow you to safely overclock, too.
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post #7 of 11
the PCI has to stay at 33mhz for stability, I wouldn't go over 35-37. The AGP bus is 2x the PCI, so 66mhz, so if you overclock the PCI to 35mhz, the AGP bus becomes 70mhz, and alot of AGP cards don't like an increase in bus speed, i.e., blank screen at boot, or artifacts.
post #8 of 11
Usually if there is a FSB adjustment there is a way to lock the agp/pci bus.
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post #9 of 11
Silent errors are the worst.... you don't know your data is getting corrupted until it all fails. Don't overclock the bus!
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post #10 of 11
Don't OC it at all. Upping the PCI speed will do nothing for performance and can be very harmful for stability. Upping the AGP frequency can increase performance in some situations, but this is very minor, and few chipsets/cards can handle much.

I once forced my 6800GT to AGP 4x with the AGP Bus at 100MHz and got some small gains (1-3%). The NF3 chipset could handle the higher AGP speed just fine and the PCI speed was locked at 33MHz. The card seemed to like a high clock speed, but lower multiplier more, and I never ran into any real problems with the setup.
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