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unless you are buying a 2.8c, 3.0c, or 3.2c don't even think about looking at the max3. It has a 5:4 divider bug that has horrible oc'ing. The p4c800 can consistently oc higher than the rest of the mobos out, but by a fairly small margin. There are several different bugs that seem to pop up in the max3's that alot of people complain about, and end up returning the board. Max3's can either be realy good or realy bad, seems to be about equal both ways, but at it's best it is on par with the p4c800 but has the higher vdim which is nice, but the vdim mod for the p4c800 is realy easy, and now you don't need to solder or use smd grabbers to do the vmod...just takes a wire, a vr(actually have to solder wire to vr, but nothing to mobo) and about 5 minutes.
I decided to go the path less traveled and picked up a 4pca3+ rev2, which has great voltages and performance. I hadn't put my prommy on it yet, but I was going pretty well with my 2.4c@ 3.4(it is a crappy 2.4c, the highest I got it on an ic7-g was 3.3 with a cnps7000-cu) stock cooling and volts, and stock vagp. The performance was great, and and realy don't regret purchasing this board, especially because it is so much cheaper than the max3 and p4c800-e. I have a good 2.6c coming that can do 3.95 with 1.65v@-11c, and I should be able to get it cooler and higher with some time and tweaking. I could have gotten a 2.4c that could do about the same, but my memory can't do 2-2-2-5 that high, so I would either have to loosen timings or slow down the cpu, but with the 2.6c I won't have to do that.