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GTX 660(non TI) SLI power supply help

I'm wondering if a 620w max power supply is safe for two GTX 660's... I built my first computer a while back, overclocked it and love it. Now I want to see if I can add another GTX 660(non TI) and SLI them to run some new games maxed out. Right now my PC consists of:
Asus P8Z77-V
i5-3570K @ 4.5Ghz 1.28v
Corsair H60 v2
EVGA GTX 660 FTW Signature 2
Corsair 300R Windowed Edition
SeaSonic M12II 620 PSU
G.SKILL Ares Series 8GB (2 x 4GB) 1866mhz
Asus Blu-ray Burner(BW12B1ST)
Seagate Barracuda ST500DM002 500GB

Overclocked the PC runs perfect with no errors, but I know the CPU draws more power. Right now this isn't an issue, but will it become one if I add a new GPU?

Also, my PSU is rated at 620w MAX, will that affect anything? If I remember correctly it has 24 amps on two rails(not really sure what that means, but it matches up with what I think the GTX 660 needs). I read some reviews before I bought it, and they seemed pretty good which is why I bought it. Will it hold up over 1-2 years? Will this fry my parts? How dangerous is it for them?

This whole thing(building my PC, OCing it, and upgrading it), is a learning experience for me. It would be great if you told me your reasons for what you think and why so that I can gain some knowledge of how this all works. I just want to learn. Thanks for all the help, I really appreciate it.
5 answers Last reply Best Answer
More about gtx 660 sli power supply
  1. Best answer
    620 watt is enough for sli 660's :p
  2. TBC1 said:
    620 watt is enough for sli 660's :p

    Will my overclock affect anything? Also is there any chance of running into problems down the road in 1-2 years as the PSU ages?
  3. pieguyx1000 said:
    TBC1 said:
    620 watt is enough for sli 660's :p

    Will my overclock affect anything? Also is there any chance of running into problems down the road in 1-2 years as the PSU ages?


    There should be no problems with overclocks using your psu - also, who knows how long the psu will last.
  4. Could I have a few more thoughts on this? I'm probably going to buy an identical GTX 660, and I revised what I had mentioned before; I have a M12 II 620w instead of a S12 II 620w. Both are seasonic, and both have 24 amps on two 12v rails.

    http://www.seasonicusa.com/images/M12II-Bronze/M12II-Bronze-03.jpg

    Does the fact that I have 2 120mm fans and 2 140mm fans change anything? I may also add an SSD in the future. Thanks.
  5. pieguyx1000 said:
    Could I have a few more thoughts on this? I'm probably going to buy an identical GTX 660, and I revised what I had mentioned before; I have a M12 II 620w instead of a S12 II 620w. Both are seasonic, and both have 24 amps on two 12v rails.

    http://www.seasonicusa.com/images/M12II-Bronze/M12II-Bronze-03.jpg

    Does the fact that I have 2 120mm fans and 2 140mm fans change anything? I may also add an SSD in the future. Thanks.


    No difference.
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