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Is a 750w Gold PSU enough for GTX 970 SLI

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post #1 of 14 (permalink) Old 01-14-2015, 12:59 AM - Thread Starter
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I have a i7-4790K CPU
I currently have a ASUS Strix GTX 970

EVGA SuperNova 750W G2 Gold.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438017&cm_re=evga_750w-_-17-438-017-_-Product

I am thinking of getting a second GTX 970 for SLI, and I am going to do some OC on CPU and GPU

Would my PSU be able to provide all the juice?

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post #2 of 14 (permalink) Old 01-14-2015, 01:06 AM
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Quote:
Originally Posted by rabinzx View Post

I have a i7-4790K CPU
I currently have a ASUS Strix GTX 970

EVGA SuperNova 750W G2 Gold.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817438017&cm_re=evga_750w-_-17-438-017-_-Product

I am thinking of getting a second GTX 970 for SLI, and I am going to do some OC on CPU and GPU

Would my PSU be able to provide all the juice?

Yes that will do fine thumb.gif

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post #3 of 14 (permalink) Old 01-14-2015, 01:07 AM
 
 
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Yes, even with high voltage on the cpu and gpus.

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post #4 of 14 (permalink) Old 01-14-2015, 01:08 AM
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it shouldn't be a problem unless you do some extreme oc 1600mhz on each card with 4790k running at 5.0. Even then you are just pushing the psu to the limit.

~ oc load is 150+150+200+100=600w. 600/0.8 ~750w exactly.

this is a very rough guess, just don't push everything too hard (it should still work).

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post #5 of 14 (permalink) Old 01-14-2015, 01:15 AM
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Will even power on 3x 970s

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post #6 of 14 (permalink) Old 01-14-2015, 01:19 AM
 
 
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Quote:
Originally Posted by xgunnas View Post

it shouldn't be a problem unless you do some extreme oc 1600mhz on each card with 4790k running at 5.0. Even then you are just pushing the psu to the limit.

~ oc load is 150+150+200+100=600w. 600/0.8 ~750w exactly.

this is a very rough guess, just don't push everything too hard (it should still work).

Confused by this. You're saying the psu is good for 600w only since it's 750w

Because it's 748.8w on the 12v rail with 90% efficiency(for eg) means it can pull 832w from the wall?

Am I wrong?

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post #7 of 14 (permalink) Old 01-14-2015, 01:22 AM
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na, i just use a .8 multiplier for aging, assuming you will be using that psu for at least 3 years,, and it ends up pretty damn close to the online psu calculator. It will never need to draw 832w from the wall (in real world conditions) lol.

you can try the calculator online and i bet it'll say something between 650-750w recommended

i just add the cpu load+the 2 cards+100 for everything else.

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post #8 of 14 (permalink) Old 01-14-2015, 01:25 AM
 
 
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I see what you mean.

Thanks for clearing that up.smile.gif

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post #9 of 14 (permalink) Old 01-14-2015, 02:23 AM
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You can run X3 GTX 970's with 750W.

Matrexx
(18 items)
HTPC
(15 items)
CPU
Ryzen 7 1700X 4.0GHz
Motherboard
MSI X370 Gaming Pro Carbon
GPU
MSI Ventus OC RTX 2060 Super
RAM
16GB Night Hawk 3600mhz
Hard Drive
480GB Corsair MP510 NVMe M.2
Hard Drive
500GB WD Blue 3D SSD
Hard Drive
X2 1TB WD & Seagate
Hard Drive
3TB Hitachi Ultrastar
Power Supply
EVGA 750W BQ
Cooling
CM MasterAir MA410P
Case
DeepCool Matrexx 55 A-RGB
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Windows 10 Pro - 64 bit
Monitor
Acer ET322QU 75HZ 1440p
Keyboard
Logitech G413
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Steelseries 9HD
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Logitech Z625 2.1 (200W)
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ASRock AB350 Pro4
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GT 210 (Temporary)
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16GB G.Skill Ripjaws V 3000mhz
Hard Drive
500GB Samsung 860 EVO SSD
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ASUS DVD Burner 24X
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EVGA 600B
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post #10 of 14 (permalink) Old 01-14-2015, 05:05 AM
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Already using it in my rig, it does the job really well, yet very quiet.

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