got my first rig coming online. 6x Sapphire R9-390. I have 2x 750w power supply. Am I good? Does anyone have these cards and know the watt draw? Thank you :-)

  • Holy, 6x R9-390 would suck around 1800-2400W. I have 2x 390X which pulls around 350W each.
    – q9f
    Commented Apr 7, 2016 at 8:02

1 Answer 1


My 2 x Gigabye R9 390X + motherboard, CPU, drive + fans consume ~ 700 watts (measured with a power meter at the wall) - see Is CPU mining even worth the Ether? . My GPUs are only slightly overclocked.

Your 390 and my 390X have a 275 watts thermal design power (TDP) - see http://www.pcper.com/reviews/Graphics-Cards/Sapphire-Nitro-Radeon-R9-390-8GB-Review .

I have a 850 watt 80+ Gold (see https://en.wikipedia.org/wiki/80_Plus) power supply - this has sufficient power to support 2 390X GPUs and the other components.

Your 750 watt power supplies may have enough juice to power 2 of your cards. Better to err on the side of caution and add a margin by using higher wattage power supplies.

Also note that AMD motherboards/CPUs consume more power than the eqivalent Intel motherboard/CPUs.

  • TDP ain't power consumption : linustechtips.com/main/topic/…
    – euri10
    Commented Apr 7, 2016 at 9:28
  • Thanks @euri10 for pointing out the difference between TDP and power consumption. I've updated my answer. Commented Apr 7, 2016 at 10:07

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.