FragMagnet bested 4.4 -4.5 you ask for...he did fifteen minutes of prime95 on air at 4557, and only 1.456 vcore. He had HT disabled however, but his temps were around 83C. For a i7 920/w3520 to successfully pass prime, with no errors, at 83C and 4557 proves the superiority of its AC characteristics.
In fact, I've never seen prime95 screens at anything close to that. Could yours do the same? My guess is that it is entirely possible, or at least come close.