BitWrangler wrote on 2021-12-15, 16:07:
Well the regular 4870 seem to draw 125W full load per card on my testing, so I'd suspect you want 250W for the x2, then whatever the board uses. I had two regulars in a board/CPU known to run @ 150W max and a 500W PSU known to actually deliver 500W and all that ran fine.
Where you have one x2 you have two x2's .. one does not simply run one of these...I have two of them (now on my shelf of fame) and yeah 500watts wouldn't even power the system on, it just beeps at you and turns back off, had to put a 1000watt PSU in it to get it to power up 🤣.
1 4870 X2 = 270 watts power draw on the 12v rail so you need a decent PSU that can deliver that much via one rail at 60A-70A, there are 5 diag leds on the card and it'll light them up to tell you if its got sufficient power, the recommended PSU for dual X2s was 750watts so these dual GPUs are more power heavy than the normal 4870 was.