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850W rated PSU, good for how close to 850?

Level 11
I have a pretty decent 850. it's the AX series by Corsair which is their Professional, I think their top tier.

My question is, since I have these two new r9 290x's, how close to the 850 mark should I be okay at? When I'm using a single card in a non crossfire supported game, i'm around 600W on my Belkin Watt monitor. that is with cpu almost maxed on all cores and 99-100% of GPU use.

Throw in that 2nd card, i'm afraid to see what happens. I ran Battlefield 4 earlier, but even on Ultra it doesnt max out the cards (NICE 🙂 so eventually a game will come along that will and i'm afraid i might need to get a 1000W. thoughts?

extra info: I have a FX-9370, it does suck a bit more watts than a 8350 or below. I am overclocked to 4816MHz. Multiplier only.

Please advise...

MOBO - ASUS ROG Crosshair V Formula-Z
CPU - AMD FX-9370
RAM - AMD Radeon R9 Gamer Series 16GB (2 x 8GB) 2400 MHz
SSD1 - Samsung 840 EVO 250GB // Boot
SSD2 - Samsung 840 EVO 250GB // Game
GPU1 - ASUS Radeon R9 290X
GPU2 - ASUS Radeon R9 290X
COOLER - Corsair H100i AIO Liquid Cooler
PSU - Corsair RM Series 1000W Gold PSU
AUDIO - Creative Sound Blaster Z
CASE - NZXT H440 Red/Black
KEYBOARD - Corsair K95 RGB
MOUSE - SteelSeries Sensei
HEADSET - Logitech G430

hax0rmort wrote:
ouch! using FurMark with CPU burner enabled 860Watts......... wow...... I'm glad I didn't try this 2 days ago.

These cards are so awesome, even BF4 doesn't max them out on Ultra. I'm VERY pleased with these Asus cards and this power supply 😄

Oh yeah, that is a healthy power draw from that system! :cool:

Level 40
Cool beans! nice overhead even maxed out...PSU working comfortably within itself...all good!:cool: