Just tried my 8knxp with the Corsair DDR500 and got bigtime problems. Windows installation had lots of problems copying files...crashing. Tried with my old caorsair pc3200, no problems. Also that's @3-4-4-8, and won't let you adjust the cas to 2.5 or 2..your stuck with 3-4-4-8..which doesn't work. I would guess it would be the same for corsair pc3700 even maybe 3500, so stay away from corsair 3700 and 4000 with the 8knxp. Lucky i got a MAX3 with my pc4000. ;) Took my pc and stuck it infront of my a/c with a house fan..was able to get 3.76ghz @1.70v stable with the max3, i'm guessing if i got water cooling i could get much higher. http://service.futuremark.com/compare?2k1=6994465

I would try to boost up the DIMM voltage by 0.1v and see how it goes, usually high end DDR modules require extra voltage to reach 250Mhz speed, if 0.1v is not enough, try 0.2v, just dont go over 2.8v. Kevn, if I were you, I get vaporchill cooling system. Watercooling are not much better than the best heatsink out there, but vaporchill is far more advance.

Kinda of scared of using a prommy or vapo. I've heard of people damaging their cpu's, but i think i'll get a prommy mach 1 after i get the water cooling..so i can experience that first then move to something better. Thing i'm worried about with the prommy and that, is condensation. You have to insulate everything..seems like a hassle and risky. And i don't really know how much more i'll be able to get out of my cpu's with a prommy, compared to the kickass w/c system i plan on getting..so is it worth the risk and hassle?? That is the question, and reason why i plan on geting the w/c first.

Oh and i tried 2.8v and it did the same..that board only allows 0.3v increase max. But that's supposed to be only when you have the ram at 250mhz which is almost impossible with a 533mhz cpu. That's 4.6ghz.

Assuming you have a top notch air cooler already, when you blew a house fan on there with an open case next to the a/c, that was probably a better cooling solution than any water cooler, so my guess is 3.76ghz is your max unless you go for some type of chiller. Vapochill, prometia, liquid nitrogen, or a peltier+water cooler are all going to get you down to freezing temps which will introduce condensation, but there are enough guys doing it already that I'd bet you could figure out how to rig it so its no danger. hardforum.com and extremesystems.org are where you'll find a lot of threads on chillers. To me the biggest risk here is snds.

I was only able to get the idle temp down to 26c with the a/c with a 1.70v vcore. 21C with old 8knxp@1.60v. This board warms my cpu up more than the 8knxp, and it's harder to cool the cpu cause of the OTES blocking the airflow around the hsf. Right now the temp is 34c idle@ 20c ambient. Before i was getting 27c idle. HSF feels warmer than usual also. Tried taking the OTES off and the temp went up about 3-4c..guess it's doing something. But i think i would be able to get the temp down to the mid 20s atleast with really good w/c, no? I hear of people with AMD's getting 30's max load. That would give me some headroom over 3.76ghz.

http://www.overclockers.com/articles373/ The top water cooling and the top air cooling produce about the same temp increase over ambient on the above site, with the difference being that the air coolers are much louder. The best I saw at the above link was 11C over ambient for a cpu full load temp. And those aren't 3.7g cpus! Those amd temps in the 30s are cpus that are not producing that many watts compared to yours. Your cpu maxes out at 101W when it is not overclocked, and a 2.2g amd cpu is only 77W. So your 1.7v cpu is going to be like (1.7/1.5)^2 x 101 = 130W at max load, which is almost double the amd max wattage.