GTX 970 Bootcamp crash in 5,1

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picked gigabyte gtx 970g1 yesterday.

after figuring out needed latest web drivers, (and needed shut off 970 in order able boot far enough install them old gt120), got working. boots os x fine.

in bootcamp (win 8.1), card works 10-20 minutes in 3d games (elite dangerous, star citizen). video shuts off , mac reboots. tested furmark , lasts 2 minutes on stress test until crash , reboot. in case needed shut down mac start again card continue working.

don't use internal mac psu power ports on card - use external psu. @ first running 600 watt corsair card. switched 700 watt thermaltake had lying around (i know not best psus powering ports on card way under limit). also, had been running radeon 7970 corsair way in mac on year no stability issues. updated latest firmware on card, didn't help. watched temperature , fan speed while benchmarks running, card never got unusually extreme state, maybe maxing @ 68 c in furmark.

consider returning card possibly faulty when stuck in pc case. doesn't seem crash after 15 minutes or in furmark.

have suggestions on why new card can't seem handle 3d gaming load in mac?
 

i had mp3,1 gtx980 shutdown while played ac:unity, after time.

improving cold air flow (opening window) had fixed issue, guess overheat of videocard or smth else in computer.
 


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