That is weird, I looked around and saw some people overclock their cpu with that board and ati graphics, altough most were using X800 variants. Also, everywhere I looked people said the AGP is locked... Are you sure it isn´t your BIOS version?

Weird indeed. I had that same board with an E2180 and Radeon 3850 AGP clocked up to 286mhz no probs. Only issue with that board's o/c was inability to raise voltages.

I've noticed strange results with the board.

-With a 200/800 CPU, when the FSB is overclocked to 266, the 9800 draws a lot of artifacts (messed up geometry).
-With a natively 266/1066 CPU, which the BIOS sets to 266 automatically, once the board warms up and works, the 9800 is fine.

So it seems that the BIOS is reconfiguring stuff behind the scenes if you run a 1066 CPU.

Just racked my brains tryjng to recall when i had this board. Are you by any chance using 1gb dimms? I remember this board not liking large dimms, overclocking poorly with them. 512mb dimms work best with old chipsets, my 2.86ghz oc was with 2x 512mb. Once i changed those out for 1gb dimms i remember the board had issues with even 266mhz. Oh yeah, 1066 fsb only works with cl2.5 ram ....try checking that too

Did you try and use a modded CPU on that board? I know from my Asrock 4Core Dual SATA2 that it wouldn't run stable with FSBs higher than 242 MHz when using a FSB800-CPU. With a little conductive ink and two pads connected on the bottom of the CPU, I could go as high as 295 MHz (292 fully stable), since the board was using other FSB straps.

Ah that's right - the FSB straps aspect. No I didn't try that trick. I sold the E4400 and bought an X6800 because I wanted to play with an unlocked Core 2.

I haven't really been messing with the board for the past month. I have some new ideas to try now though thanks to you guys.