Is my psu power ok to aply 2 gpu card as sli?

hi
i lost 2 pcs in 1 day ..just replace my msi n-vidia 275gtx twin frozn with one msi n-vidia 295 gtx press the start buton and end with pc dead (dead mobo msi, HDisks1 t, cpu amd, and psu 600wthermaltake.. and the gtx295 and many more plus 1mobo gygabit, and intel 8500e, with 620w psu corsair  )yes  2 pcs in 1 day .. so i replace the <<old>> stuf with new,,, and i want to bye one more  msi n-vidia 275gtx twin frozn 896mb oc and make a sli.
my psu is the
 Nexus RX850
Model No.        RX-8500
AC Input    115V/230V   15A/7,5A  50/60Hz
DC Output    +3.3V    +5V +12V1 +12V2 +12V3 +12V4 -12V +5VSB
Max Output Current    24A    30A    20A    20A    20A    20A    0.8A    3A
Max Combined Power    170W    760W    6W    15W
Total Power    829W
and the gpu the MSI GeForce N275GTX Twin Frozr OC 896MΒ as i say
is ok to buy 2 card or is better and safer to keep the one 275 ?? ty ahh   

yap just place 2 gtx275 and test it in gpu-killer game age of conan, i got 20-25 fps more than b4 and 45-70  at max setings with dx10 on my 24i screen at 1920-1080 ress . near 70-90% more fps -run near 4 hours with no prob  from psu or anything alse... i test more games and things when i move back to my main home and post back if anything gets wrong 
the bad thing is that one gtx295 die and kill my 1st pc ..and the ultra bad luck that the same day we set up one new pc with used parts from  my mate other pc and also end in smoke (the fun or cry thing is that nothing exept the pc case was the same all dferent parts even the psu -corsair..) .. HDisks are wasted and the repair cost  to get my total loved data back is like buying 10 new disks,  ty again mates 4 help

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