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PCI Bus

post #1 of 3
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Ok, I was reading through the Ultimate Overclocking Guide located here and for the PCI bus it says to make sure it is locked at 33mhz. Is this relivant to PCI express cards cause the guide was written with no mention of PCI express cards so I was thinking this is somehting for AGP boards only but I wanted to make sure I wasn't overlooking something very important to overclocking.
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post #2 of 3
Mhz locking of the various Bus' helps in stablilty when Overclocking.
Bus:
PCI - 33Mhz
AGP - 66Mhz
PCIe - 100Mhz

This is due to the other devices that are running off these bus', such as GPUs and SATA Controllers.

On the nF4 MBs, such as the DFI & Asus, you will find that the SATA controller is on the PCIe controller so keeping this stable helps your HDD stay online with the rest of the system... in some cases people have changed this to help a GPU card - up to 101Mhz for nVidia and 105Mhz for ATI.

In the Asus the PCI bus must be manually set to 33Mhz when OC'ing otherwise your system becomes unstable.

On the DFI I have never had the need to change the PCIe clock from 100Mhz - this can be found in the Genie settings.
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post #3 of 3
Quote:
Originally Posted by fro_dave
Ok, I was reading through the Ultimate Overclocking Guide located here and for the PCI bus it says to make sure it is locked at 33mhz. Is this relivant to PCI express cards cause the guide was written with no mention of PCI express cards so I was thinking this is somehting for AGP boards only but I wanted to make sure I wasn't overlooking something very important to overclocking.
Yes the same specs apply to PCIe and PCI.
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