I had the weirdest thing happen to me today. My Thermaltake 250 watt VGA psu up and died on me while the comp was idle in windows. I popped it open, and no caps were blown, nothing looked burned. Anyway, my main psu that I had to fall back on to power the cards is a BFG 650 watt sli able psu, with two +12 rails @20 amps each. Most reviews I have read for Crossfire on two 5770 cards show total system load at a tad over 400 watts or so, and sometimes a tad below that, though I didn't see too much on amps usage on the two cards. With a 650 watt psu I figured Im safe, but I wanted to get some other opinions from others using these cards in Crossfire on what they feel from their experiences they have needed for them, and what you guys are currently using to satisfy those power needs? What are you system specs too?