The aforementioned mobo with Intel e4500 and 4x1 ddr2 800 running at 5-5-5-18 2T.
I'm looking to do a modest OC but I can't even increase the QDR FSB by 1mhz. The default is 800, so if I set it to 801, the board won't post. At which point I have to remove the cmos battery and let it clear before it'll post again.
The board seems to be stable as I've been using it for over a year now.
That MB certainly isn't meant for OCing, nor is it very good at it. However, I'm running my e6420 (normally 1066MHz FSB) on it at a 1333MHz FSB with good results for more than a year. I'd just set your FSB directly to 1066MHz (after making sure your RAM voltage is set to the proper value for your DIMMs - probably printed on the side of the DIMMs), and see if that works. Of course, make sure your memory bus speed is unlinked from the FSB, since you want a 1:1 ratio. For your current 800MHz FSB, that would be DDR2-400 speed. For a 1066MHz FSB, that would be DDR2-533 speed.