I'm at 4.1 right now (4.2 didn't like F@H) but I've been as high as 4.5ghz (not stable at all lol)
Getting 4.2 out of a W3520 will be a piece of cake... and the Megahalems don't need a lapping as bad as the TRUE's do... just get some good fans in push/pull and you are set
lol no....it will not be a peice of cake, getting a 4.2 stable, without lapping, and no water cooling will be rather difficult. You cant just add fans and hope things will be ok. BTW, you have water cooling, not a heatsink, so why would he want to know what you can get stable....
IF you are lucky you could get a good chip that you work on to get to around 4.0....4.2, 4.0 should not be too hard, but 4.2 will be. My temps are about mid 60's folding, high 50's gaming. A little hot, but i have it over volted right now beause i was trying to get folding working.