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I've got E6600 running stable at 3.2Ghz on 1.35v, Idle temps are 28c , full load with orthos temps never go higher than 48c , ocd my EVGA 8800gts 640Mb grapics card core 702Mhz and Memory 1025Mhz and got 3DMark 06 of 12437
http://service.futuremark.com/results/showSingleResult.action?resultId=5698828&resultType=14
I bought mine for £50 today. Can't get it going until I get the rest of the components.
Both air and water, with a half decent cooler even something like a freezer pro you should get 3.6
I had mine at 450 x 8 and performance was good for gaming. Run TAT and watch the temps shoot up on air mine would hit 65 degrees, the good news is you won't find anything else that will push it that hard, not even prime/orthos or any app I have found will make it run as hot as TAT.
If I remember correctly the L729B was supposed to be the second best stepping and the best was supposed to be the L728B not that I ever got to try one of them
anyhow it should be a nice little chip .... ENJOY
I had the 27,28 and 29B stepping and the best of the bunch was the 27B. The 28B was very hot.
All could be good for 4ghz if you don't mind pushing the volts up.
Have you tried 9x400?(1.5v) I have yet to see an E6600 that couldn't do that.