Mine does I have E8400 and it will not boot anything above (9*1333/4) or (9*333) which ever way you read it at stock. I had a striker extreme and was running this chip at 4.6ghz
There are numberous reviews of this board where there is a fsb wall as there is a chip limation and due to it been PCI-E frequency.
What chip do you have a what are you bios settings?
I have two boards right now, Im running my P5Q deluxe for a few days, the ga-g31m-es2l has just been pulled but I will be using it again on Thursday.
It has only been 24 hours or so since i pulled the board so I remember the main settings.
CPU volts: 1.36 (just over the stock vid of the chip)
RAM volts: 2.1v 5-5-5-15(2 gig pc2 8500 OCZ sli edition, stock, had to set it though)
375FSB (x8)
I know I booted 400x8 but didnt find stable so never tried much else as wanted to play MW2 more than I wanted to play with OC'ing at that time.
Will post proof in but a few days.
BTW that was on a E2140, only 800FSB with a multi of 8
A E8400 is 1333MHz with I think a multi of 9, should over clock nicely as well, I did find attaching a little fan to the NB heatsink improved OC stability, oh and newest BIOS.
