I got my X2 4400+ last week and am currently seeing what it is capable of. It's on a DFI nF4 SLI-DR mobo and has decent air-cooling (XP-90C, 50cfm 2400rpm 92mm fan, Arctic Silver 5) so it should overclock okay.
So far I've verified using two instances of Prime95 (one on each core), that the...