So,I've done BSEL mod on my e2140 to make it 800 > 1333 FSB.Problem is,I pass only half in IntelBurnTest on 333 x 8 @ default vcore.Hence,I instead lower it to 300 x 8 @ default vcore and it's perfectly stable,passes all the stress test.But due to some issues with my board,my pci-e clock must be set at Auto else it won't boot.So i'm wondering whether my pci-e clock is running at what speed now?will it be 333 - 300 = 33,so 66MHz?if it does run at 66MHz will it cause any harm to the pc?

PCI-E runs at a default of 100mhz. The 'auto' setting usually sets it to the default setting..... you don't have to set it to any other settings unless you're an extreme overclocker or there are some stability issues at default 100mhz speed.

i thought the "auto" means it'll not be locked and will go according to the fsb speed?

I don't have much experience with many boards, just 2x or 3x P35 boards. As far as I know, the "auto" setting for PCI-E is set to a default of 100mhz. It doesn't overclock if you overclock other parts of your rig i.e. CPU or ram.

leave it to auto will do and it will stuck at 100mhz