PSU wattage for 2-SLI GTX 660

LyeSjka · Oct 12, 2014

Hi,
I have the following system :

PSU : CM 620W
Case CM Sileo 500 (1 fan on the back and 1 on the front)
1x DVD-CD/RW Reader
MSI Z97 MPOWER
I7 4790K @4.4GHz + Noctua NH-D14 and its 2 fans
EVGA GTX 660 FTW ACX 2GB
2x4GB Corsair Vengeance PRO 1866MHz
2x500gb Seagate Barracuda 7200rmp
1 frontal panel : 2xUSB | audio and mic jack | e-sata

I'd like to know if with my actual PSU i can add another EVGA GTX 660 for a 2 way SLI.

clutchc · Oct 12, 2014

That's a bit light for 2 x 140W cards. If the PSU has the necessary 6 pin connectors for both cards, you can probably get by with it. But it would be nice to know the +12V rating of the PSU first.

Dark Lord of Tech · Oct 12, 2014

It's not the greatest power supply quality wise , I'd go with a decent 650w from SEASONIC , XFX , Antec.

LyeSjka · Oct 12, 2014

clutchc :

It has the 2 connectors you mentioned (6 pin)

These are its ratings

Dark Lord of Tech · Oct 12, 2014

It's not the greatest quality wise , but it should be able to power the 660's.

clutchc · Oct 12, 2014

Well... technically, it has sufficient specs for 2 x 140W cards and the 88W CPU. It should work OK. It's still a bit light for efficiency tho. But you can use it.
I'd pick up a kill-a-watt meter and set it for watts. See if you go past 500W (~80% power) when the system is stressed. If you do, it will be time to think about upgrading the PSU.
http://www.amazon.com/P3-P4400-Electricity-Usage-Monitor/dp/B00009MDBU
You can find them in most hdwr. stores too.

LyeSjka · Oct 12, 2014

I've calculated around 600W based on my normal use (eXtreme outer vision psu calculator), i was just worried becasue i'm too close to its 620W capacity, even thought i seen that it can actually max up to 700W as declared by Cooler Master.
Just in case the PSU won't handle the new load, do i risk any damage to my pc components?

Dark Lord of Tech · Oct 12, 2014

You should be fine for now , but I would go a little higher in the near future , get some get some headroom for better efficiency.

michaelhall · Oct 30, 2014

I get my new 660 tomorrow I'll be sli'ing them I use a corsair cx 600 watt not the best psu in the world but will it handle it until I upgrade, also I have the fx6300 , 2 HDD's an SSD and 16gb corsair vengeance , thanks mick

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PSU wattage for 2-SLI GTX 660

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