depends on hardware. if this is a core2 system 444 vs 555 timings give just about the same performance so the higher clock speed is better. but i hope a core2 wouldnt need 1.55vcore for less then 3ghz. so what are you actualy talking about?
If that's a C2D, then should be the 2.94GHz one. But both those vcores are terrible for a C2D under 3Ghz so you're probably talking about something else.
In that case, best just run 3DMark or other suitable benchmark and tell us!
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