gtx 580sli power supply

MasFBailey · Jun 17, 2013

hi im about to order my second gtx 580 twin frozr 2 and run them sli. i currently have a corsar gs700 psu and i cant find a straight answer as to whether this is enough power for my cards. herd everything from 600w to 1kw can anyone help ?

ihog · Jun 17, 2013

Both cards will draw about 244W max each, so 488W all together. Use a PSU calculator, and use a quality PSU that supplies a bit more than what the calculator tells you.

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

jnkweaver · Jun 17, 2013

Straight answer is no. It is not enough. You should have a 850W or better and 4 pci connectors 2x6 and 2x8. the GS 700 has only 2 connectors and only 700W.

gmkos · Jun 17, 2013

Your PSU has a single +12V@56A rail which is good.

At full load you need roughly 250W TDP a piece for those 580s, without any overclocking.

That would leave 200W for everything else in your system. Your CPU is probably 70-100W TDP. Motherboard/HDD/SSD/OpticalDrive/Fans are all less than that, but its going to depend on how many of what you have.

Its a given that you wouldn't have any headroom with your current PSU. Whether you could get away with it or not, is too close to for me to call, I think you can pull it off but couldn't guarantee what would happen with those GPUs under load.

Safe bet, if you have the money, upgrade to an 850W PSU of equal quality, probably looking at $150 for that, minus whatever you can get for your current one.

MasFBailey · Jun 17, 2013

ok i understand what you're saying and i don't think i'm going to risk it. i dont know what to do now though, because i'm not confident enough to install a new psu and another card in sli my current computer was put together for me and im still very much learning. is there another option to the gtx 580's ?

ikaz · Jun 17, 2013

Well how much money did you plan on spending on the 580 and PSU combined it's probably better just to sell your 580 and pick up a 770/780.

gmkos · Jun 17, 2013

MasFBailey :

PSU swap is not much more complicated than GPU. For added confidence, you could take a photo of every connection as you unplug it and refer to those photos when plugging in the new unit. The unit itself physically comes out very easily, usually just 4 screws on the back of your tower.

Only other option I could see would be to sell the 580s and get a newer single GPU that uses less total draw power.

jnkweaver · Jun 17, 2013

I agree with the rest. Changing a psu is simple and rather than SLI spend the money on 1 card and you keep the old psu. It is a decent model for a single card.

this site helps alot for the connector challenged people
http://www.playtool.com/pages/psuconnectors/connectors.html

MasFBailey · Jun 17, 2013

jnkweaver :

Thank you all for the advice i really appreciate it , i think im going to try the sli and install a new power supply and use the above website etc to help me out as its about damn time i figured out what to do. dont think ill upgrade to another single card as very expensive and dont offer me as much performance as i'd like

finally could one of you please link me to a PSU that you would recommend that has everything i'd need for the 580 sli, i'd really appreciate it and sorry for being a noob

jnkweaver · Jun 17, 2013

This XFX is a great psu
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207011

jnkweaver · Jun 17, 2013

This XFX is a great psu
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207011

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