<< I doubt they are Sparkle powersupplies. You voltage readings coming off from my girlfriend's Powerman 300W ps is far from steady. >>
You kidding me?
My friend and I have almost identical configurations, except he's got an enermax 350 watt, and I've got a powerman 300.
I have yet to see my 5v line (the crucial one) go below 4.85, and its usually right at 5v. His jumps from 4.75 to 5.21 and all between, constantly.
Powerman's are very nice PSUs, IMHO.