I have the 8KNXP and the agp/pci lock is NOT working, funny you post this question cause i am digging all online world to find why the gigabyte flagship with all those overclocking features has a setting in the bios to lock the agp/pci frequency but it DOESNT work.
With 133 fsb cpu the board maxes at 160 fsb where the agp is 83Mhz and with 200Mhz cpu it maxes at 250 where agp is again 83Mhz.above those points it crashes and all the crashes are agp graphics or pci sound related.Cooling the cpu (water cooler and phase change) doesnt work neither more voltage and rams are not the fault , the easytune software from gigabyte (it is software that can alter the fsb and all the frequency settings from inside windows) reports that agp/pci is not locked no matter if i lock it in the bios or not.And easytune fails to set the agp/pci to anything esle also.
I tested some other models from gigabyte (845PE and sis648FX)and those work fine.
I do not know if all the 8KNXP have this problem or just a few
MAYBE TOMSHARDWARE NEED TO TEST THIS ISSUE.