When i ran my p5q deluxe p45 q9550 combo, 3.8ghz came very easily, cpu had a 1.200 vid, 3.8ghz on 1.216 vcore, pretty easy clock, would have went higher if i had pushed it, got lazy and bought an i7. If you want good clocks from a 45nm quad, get a p45 board, x38/48/780i are no good for theese cpu's
I second this. I've got roughly the same vcore as well, 1.2v under load @ 3.8GHz. Thanks to setter i managed to get the overclock easily and is entirely stable after many hours of prime. Temps are also very nice with the fenrir.