Hello wrathofkira. I would take one of those 290x's out of the equation since there seems to be a lot of speculation about the 12v rail on the particular PSU only being rated for 600 watts. I can tell you with my two 290x's and cpu under full load consume around 950 watts shown on my power consumption meter. This would NOT work out in your favor with the setup you have w/ this PSU. Remove one of the 290x and try to see if you still have this issue. IF so, swap the GPU out with the other and try one more time to rule out a bad GPU.
This way, you're ruling out two things. One, the PSU not being capable of supplying required power, and making sure that both of your GPU's are good.
Nice GPU's btw, 16gb of VRAM
🙂 They seem to run pretty cool also.
*caveat - Idling, there should be no problem with your PSU keeping up. Under idle with my 290's and CPU/Mobo I'm only pulling ~290-340 watts. There has to be something else going on.
-hax0rmort
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