Powering SLI gtx 480s

Hey, I have a GTX 480 (overclocked) powered with a booster x5 power supply. Its a secondary, small 450 watt power supply that goes in to 5.25 drive bay. I want to get a second 480 for sli but I dont know how to power it, and im hoping I wont have to buy a new power supply. My main PSU is a corsair cx600.

I was wondering if I can use the 8 pin pci from the cx600 and a 6 pin from the booster x5 to power the second 480. Or if using two power supplies for one card could or would damage it.

Thanks for any advice or help!
16 answers Last reply
More about powering 480s
  1. you can try doing what you said above but for a piece of mind i would get a good 750w power supply. i would not risk burning up the graphics cards
  2. OP: bad idea...

    sell your psus, (or at least keep the corsair for another build)

    and get a solid single 750 watt or up psu... 480s can be power hogs

    technically you can utilize multiple psus but I would not recommend it.
  3. I want to get a new power supply, and need to. I'm on a budget and right now its either power supply or graphics card. And I dont need to power supply until i get the second card, would it be safe to use 2 psus to power 1 card for a couple weeks until I can get a new PSU?
  4. I want to get a 850 watt psu, but their would probably be a 3 week period that I would use my old ones to power the card. I figured this wouldnt be a long term solution, but would it be damaging to the card for a short period of time?
  5. I had 2 GTX 480's in an overclocked situation like you talk about. I was also using an i7 920 overclocked to 3.8G at 1.22v. Doing some tests I saw my system hit almost 950 watts (furmark). I would say anything less than 850 would not be wise.
  6. Ibower12 said:
    I want to get a 850 watt psu, but their would probably be a 3 week period that I would use my old ones to power the card. I figured this wouldnt be a long term solution, but would it be damaging to the card for a short period of time?
    To risky i suggest you don't screw around.
  7. Do you already have 2x GTX 480s? or are you planning on buying another one to SLI...
    I you're planning on buying another one to SLI, I'd just recommend that you sell your current GTX 480 and get a newer single card GPU...
  8. killerhurtalot said:
    Do you already have 2x GTX 480s? or are you planning on buying another one to SLI...
    I you're planning on buying another one to SLI, I'd just recommend that you sell your current GTX 480 and get a newer single card GPU...


    I only have one and intend to buy another soon. I don't want to deal with selling mine and wouldnt know where I would. I also dont think I would get enough money to make it worth the performance gain. With my current overclock it outperforms a stock gtx 580. And the one im going to buy is $160. So for the money a second 480 is the best. Even though I may have to buy a new psu, I was going to anyway.
  9. ahnilated said:
    I had 2 GTX 480's in an overclocked situation like you talk about. I was also using an i7 920 overclocked to 3.8G at 1.22v. Doing some tests I saw my system hit almost 950 watts (furmark). I would say anything less than 850 would not be wise.

    I was still planning on keeping 1 on the booster x5. Also what temperatures did you see with them? And did you use aftermarket cooling?
  10. Ibower12 said:
    I was still planning on keeping 1 on the booster x5. Also what temperatures did you see with them? And did you use aftermarket cooling?


    Yes, I was using aftermarket cooling from Arctic Cooling. The temps I was seeing would hit 100C under 30mn of Furmark in my old case. Under normal usage I wouldn't see anything over 70C. Both of my cards were running cores over 800MHz. Now they just do physics for my GTX 680.
  11. ahnilated said:
    Yes, I was using aftermarket cooling from Arctic Cooling. The temps I was seeing would hit 100C under 30mn of Furmark in my old case. Under normal usage I wouldn't see anything over 70C. Both of my cards were running cores over 800MHz. Now they just do physics for my GTX 680.


    Right now my 480 runs at 875mhz And never goes over 75c, I have a haf 932 with a fan hod that blows air into the back of the 480. I'm fine with these temps, but I figured it would get a lot hotter. What cooler did you use?
  12. My son had 480 sli he sold his cards though on ebay for $120 a piece.He replaced the stock coolers though as they ran to hot in sli.Both of his cards were running at 840MHz. http://www.newegg.com/Product/Product.aspx?Item=N82E16835426026
  13. So just something

    Gtx 480 in SLI are VERY power hungry and perform really good. At stock speed they consume 608 W

    So u will need a good 800W PSU.

    I dont know what cpu u have but i can say that

    15W Hdd
    25W Dvd
    8W each ram stick i assume u have 2 = 16 W

    So still come to my point 56W + 608 = 670W

    Add ~ 100W CPU = 770 W

    So u will need a good PSU at 850 W :)

    Maybe a Corsair TX / Hx series.

    Tell me ur budget if u can upgrade ur PSU.

    And to come to your Q

    I dont think u should do what u are thinking to do .

    U could damage it .

    And about the cooling Artic extreme plus II is just GREAT
  14. Ibower12 said:
    Right now my 480 runs at 875mhz And never goes over 75c, I have a haf 932 with a fan hod that blows air into the back of the 480. I'm fine with these temps, but I figured it would get a lot hotter. What cooler did you use?


    http://www.arctic.ac/en/p/cooling/discontinued-products/vga/18/accelero-xtreme-plus.html?c=2264
  15. No one has mentioned that SLI (and Crossfire for that matter) still doesn't work that great. There are issues with it like drivers, games and microstuttering. That doesn't even include the heat and power usage that has already been mentioned. I have used both SLI and Crossfire and when it does work, its great, but in my experience I could never recommend them. I do recommend getting the fastest single graphics card you can afford.
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