psu size question looking to crossfire and dont know whats enough

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wss_003

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Jan 13, 2014
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I am running a corsair 850 right now...I believe I'm not at home and being it was my first ever build I didn't do near enough research on the psu end and a friend had one he bought and never used so I got a good deal. My build consists of a asus crosshair v formula z with a fx-9370 4x4 ram and a 270x I'm also running a ssd for my os and a 2 tb hdd for storage and then as far as fans and cooling I have an h110i and including the 2 fans on that I have a total of 5 fans but will likely be upping that to 7 with a push pull setup on my cooler. the 850 is not even activating the cooling fan when I'm playing bf4 at least that I've noticed but I am soon going to be crossfireing with another 270x and was going to bump up to a 1000 watt psu but I did the on line calculator thing and its saying I need closer to a 1400 watt for it to be running at 80% that seems excessive for what I'm doing but again not that up on psu so what's a good number to support that and what unit is best
 
Solution
ko888
For a system using two AMD Reference Design Radeon R9 270X graphics cards in 2-way CrossFire mode AMD specifies a minimum of an 700 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 43 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

Since a Corsair 850W PSU would have at least a +12 Volt continuous current rating of 70 Amps you have way more than enough capacity to handle your intended upgrades.
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ko888

ko888

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Feb 18, 2009
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For a system using two AMD Reference Design Radeon R9 270X graphics cards in 2-way CrossFire mode AMD specifies a minimum of an 700 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 43 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

Since a Corsair 850W PSU would have at least a +12 Volt continuous current rating of 70 Amps you have way more than enough capacity to handle your intended upgrades.
 
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Solution
qbsinfo

qbsinfo

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Jul 26, 2012
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it was a bit difficult to read you exact specs from your post, sorry.

but you have an
FX-9370
asus crosshair forluma z
4 sticks of RAM
1 SSD and 2 HDs
h110i and 5 case fans
( ~300 - 325 watts)
and you're looking to run a R9-270x set up?
(135 to 170 watts each)

i cannot for the life of me fathom why a quality 850 watt PSU CANNOT run that . . .( less than 700 watts gaming)
 
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