Autooverclocking isnt very sophisticated. Switch to manual autoclockinging, and under memory turn the MAM to off. I never managed to get MAM active except at near stock speeds.
There's another setting on the same screen as the manual overclocking option, dont remember its exact name but it has options Auto, Disabled and Enabled if I remember right.. Might just be Enabled and Auto... Make sure its Auto as well. Basically your trying to make sure that the board doesnt try to enable MAM at all. MAM is an asus 'hack' to enable PAT on the 865 chipset.
By disabling MAM you'll probably get a lot more than 10% overclock. My P4P800 was stable with FSB at 266,(
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I dont remember how that board describes its memory speed, some use a ratio, but I 'think' that board lets you pick the memory speed from a list. 400 will be the 1:1 ratio, 333 will be 5:4, 266 3:2. Anyway if you start out with the memory at the slowest speed (266 or 3:2), then you can clock the system as fast as the possible and more than likely will find the cpu/motherboard limits. Then once you know that, you can start at a lower cpu speed, but with the memory running faster until you find the fastest speed the ram works at.
Then pick the best combination of memory/cpu performance. Thats the tough part. Best performance is normally a balancing act, a massive cpu overclock can be slower than a modest cpu overclock with the ram running at the highest speed possible.
You'll also be able to 'tune' the memory settings to get optimal performance. Memory settings you need to start with big numbers, and gradually work down.
(Thats the CAS and similar settings). Perfect ram would use 2-2-2-5-1T settings, but not all ram will do that, shouldnt need to go much worse than 3-3-3-8 though.
Hope that helps.
, It wouldnt surprise me if you need to clear cmos a few times while your getting to know your motherboard.