psu for sli?

Ginger-Menace · 19 Oct 2011 at 21:43

Evening all, got myself another gtx 570, currently on its way to me. my current psu is a corsair tx 750w which is about 2 years old, my system is in sig. will this psu be enough for sli 570's? now just in case i do need a new one i've had a look at these.

corsair

http://www.overclockers.co.uk/showproduct.php?prodid=CA-028-CS&groupid=701&catid=123&subcat=1084

coolermaster

http://www.overclockers.co.uk/showproduct.php?prodid=CA-192-CM&groupid=701&catid=123&subcat=1103

BeQuiet

http://www.overclockers.co.uk/showproduct.php?prodid=CA-045-BQ&groupid=701&catid=123&subcat=1083

now if i also wanted to watercool my cpu/gpu's would my current psuy be up to that aswell? or which other psu would be best?

Thanks in advance

GM

Speed · 19 Oct 2011 at 21:45

Your PSU should be fine, the TX series are excellent units. Obviously if you do have issues then you can replace it, that might be down to the age of the unit more than anything.

The AX is overpriced imho. Get either a Corsair TX V2 850W unit, or an XFX 850W, had both and they are excellent. They run SLI 480/580s without an issue.

If you want modular, the TX M or HX series are very good as well.

Ginger-Menace · 19 Oct 2011 at 22:09

lets just say for instance my psu isnt sufficient.. what would tell me that it isnt? bsod? shut down? flickering in games?

RJC · 19 Oct 2011 at 22:10

The PSU might shut down, system might become unstable.

I think some review sites managed to overload a PSU whilst testing and the system kept running without issue - I think it mitt of been the Corsair 430w.

barneystuta · 19 Oct 2011 at 22:13

Stick your set up in here, should give you a good indication if it will be powerful enough or not.

http://extreme.outervision.com/psucalculatorlite.jsp

Increase the capacitor ageing (see the notes at the bottom) and that should compensate for your "aged" PSU.

My gut feeling is it will be fine.

Speed · 19 Oct 2011 at 22:15

PSU calculators are a waste of time IMHO.

Yes, reboots, shutdowns, BSODs. Basic instability.

Surveyor · 19 Oct 2011 at 22:18

Ginger-Menace said:
lets just say for instance my psu isnt sufficient.. what would tell me that it isnt? bsod? shut down? flickering in games?

A lack of power can lead to:

bad 3D performance
crashing games
spontaneous reset or shutdown of the PC
freezing during gameplay
BSOD's

Ginger-Menace · 19 Oct 2011 at 22:31

thanks guys. fist time doing sli so being weary

SheepBeast · 20 Oct 2011 at 01:10

a review site (i forget which but it was one of the first google results for "corsair ax 750 review") tested the ax750 up to 890W before it failed. great PSUs and i have to disagree with Speed - you get what you pay for.

Speed · 20 Oct 2011 at 01:25

SheepBeast said:
a review site (i forget which but it was one of the first google results for "corsair ax 750 review") tested the ax750 up to 890W before it failed. great PSUs and i have to disagree with Speed - you get what you pay for.

I'm a big believer in you get what you pay for but sometimes it doesn't apply. The AX units are excellent quality but there is no way the are worth the asking, £130-140 for a 750w unit!?

It isnt like you are getting noticeable preformance increase for your extra £40-50 over what you need to pay either. I just don't see any advantages to spending that sort of money, it could go towards something else.

Ginger-Menace · 20 Oct 2011 at 09:13

the psu i currently have isnt the AX750 its the TX750

Speed · 20 Oct 2011 at 12:05

Ginger-Menace said:
the psu i currently have isnt the AX750 its the TX750

Indeed but an AX series unit was in your list of considerations and SheepBeast has one, hence his recommendation and me thinking he is a bit bias!

olivier renault · 20 Oct 2011 at 16:05

Both are Seasonics. So, well designed to take punishment.

Furmark will hit over 700W, but anything reasonable, 600-650w.

Remember that overclocking the GPUs obvisouly increases the power consumption. I'd say 650W would be gaming max.