I bought one. All I can tell you is that my Antec 380 PSU (p4-3, ATI 9800, 2 HDs, 1 DVDR) was making this thing squeal like a pig. I was using Nero Recode and when my CPU hit 90%+ this thing would go into overload. It says 500Va, but its only about 275 watts (or something like that)...