Originally Posted by
vox
there is no way to calculate those kind of values. i used 112mhz for pci-e at 431 because it was the only frequency that in hd tune pro didn't appear to have erratic spikes in hard drive read speeds or access, also my gpu didnt magically drop the display out of nowhere while my system was idle.
avoid changing pci-e if you can unless you can say for certain the rest of the system is stable. at least if anomalies appear its a matter of making minor adjustments to the southbridge core voltage or sb pll voltage, if you do change sb pll voltage, change the cpu pll voltage by the same amount more to maintain the gap mainboard engineers design into the system to isolate each pll from the other and vice versa.
changing the pci-e freq more than 5mhz can wreak havoc if devices on the pci-e or southbridge don't tolerate more than a few mhz deviation from the 100mhz base clock. some hard drives will drop off the bus randomly or corrupt data if their controllers design can't work with more than 104-105mhz.
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