Which power supply should i get?

I just purchased 2 Nvidia EVGA Classified GTX 590s. I was told i need something like 60 or 70 amp 12v rails. I have a 1k watt PSU but none of the 1 +12v rail is only like 20-40 amps.
I need a good PSU i can buy that will power these cards, along with my fan controller, sound card, some of my fans, blu ray drive, and anything else i might wanna use. Im planning to save up for a sandy bridge setup even tho i know nothing about it lol.

Im looking for something very affordable but that wont give me any problems, and will power my setup for the next 3, 4 or more years. Im looking for something in the 1k or 1k+ watt range unless suggested otherwise.

-Thanks
16 answers Last reply
More about which power supply
  1. Your 1KW is probably plenty because it is combined amperage on all +12 volt rails is what the specs call for. (without knowing what PSU I can not look it up to say for sure)
  2. Yes you will need a PSU that can deliver about 70 amps. on the 12v rail(s) as noted by rolli59. Your PSU should show you how many amps. (combined) are available on the 12v rails. This will determine if your current PSU is sufficient or if you need to pursue a new PSU.

    http://www.guru3d.com/article/geforce-gtx-580-sli-review/14
  3. Its 30 amps on the only 12v rail, thats why i mentioned 20-40 i forgot to correct that. I was already told i need a new power supply so im trying to get some sugestions on an affordable but good one to go with cuz i wanna install my cards asap.

    Sorry if im being a bit blunt or rude, im exhausted :P

    -Thanks :D
  4. themadhatta said:
    Its 30 amps on the only 12v rail, thats why i mentioned 20-40 i forgot to correct that. I was already told i need a new power supply so im trying to get some sugestions on an affordable but good one to go with cuz i wanna install my cards asap.

    Sorry if im being a bit blunt or rude, im exhausted :P

    -Thanks :D

    That can hardly be a 1000watt PSU!

    Cheapest I would by http://www.newegg.com/Product/Product.aspx?Item=N82E16817371036 size might be an issue with some cases.
    The two I would buy personally http://www.newegg.com/Product/Product.aspx?Item=N82E16817139034
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817194081
  5. My bad it has multiple 12v rails

    Its a Tuniq PSU-RIP1000-BK

    AC INPUT: 100V-240V, 15A, 47-63Hz

    DC Terminal Current:
    (+5V/30A +3.3V/28A) 180W
    (+12V1/20A +12V2/20A +12V3/30A +12V4/30A) 900W
    (-12V/0.8A) 9.6W
    (+5VSB/3A) 15W

    Total Power: 1000W

    So does this power supply any good? Im gonna check another one i have in hopes that it has 70A 12v rails.

    -Thanks :D
  6. It has 900watts available which is 900/12= 75amps! Not something I would buy but it is 80+bronze.
  7. AT that power load, I'd use a Corsair HX1050 or AX1200 ..... But, I would rethink your approach:

    Two 580's hit 953 fps in Guru3D's gaming test suite for about $960
    Two 590's hit 982 fps in Guru3D's gaming test suite for about $1500
    Three 580's hit 1030 fps in Guru3D's gaming test suite for about $1440
  8. You guys are confusing me. I already purchased 2 classified GTX590s and the power supply info i listed is the power supply currently installed. So can i use this power supply with both my cards in sli?
    I dont understand how 900/12= 75 amps when its 900/4 where 40 is dedicated to two 12vs and 60 is dedicated to another two, so wouldnt that mean i only have 100 amps in total?
    I thought i needed 70 amps per rail.

    So that would be two rails of 70 amps each to power both my cards, which would require 140 amps in total.... awww this is just scrambling my brain now from all the sleep deprivation lol

    .... help :P
  9. 12 volts x 75amps = 900watts Simple calculation based on the specs of your PSU! You need combined amperage 70amps over all rails!
  10. for 2 590s i wouldn't go less then 1200 watts
  11. You can use ALL FOUR 12v rails to power the Vid cards so your current PSU should be just fine if it delivers 900W to the four 12v rails.

    My link above shows you how to determine this information accurately so you understand what you are doing.
  12. Thanks guys, i still dont completely understand everything i want to, but my mother was kind enough to pay for my PSU so i wound up getting a 1200w corsair AX psu just to be safe. If you think i might be better off with the 1050w HX lemme know cuz from what ive read the AX is better all round. I can easily make a return or cancel my order thanks to amazon :D

    I wish i had more time on my hands to read up on everything i wanted :P
  13. The AX1200 is a very good choice!
  14. Thanks, do you think it will power an ivy bridge setup well? Im trying to learn how to research better so instead of just asking on this forum for info im gonna try doing a lot more research than usual. I am exhausted so if i dont find an answer or the info im looking for im gonna wind up posting on here.

    From what ive read so far ivy bridge is the code name for the next gen intel cpus? Or the ivory is? And the sandy bridges are the latest ones, im not sure i need to read up on the ivy bridge cpus.
    Ive been wanting a new motherboard since i basically purchased mine lol.
    Im looking for something that will run my two SSD drives faster than my intel raid on my x58 sabertooth board. I also want something that can support 3 dual slot video cards so i can space my cards apart. And since i dont think i can buy a board use my i7 950 and then upgrade to one of the newer cpus since i doubt my cpu has a lga 115 socket setup.

    I have just over $800 saved up and might be able to get another 200-400 if i dont wind up buying a new phone but i most likely will cuz i hate my motorola droid 2.
  15. The PSU will power anything current and coming with your GPU's! Your current LGA1366 CPU and board are going to be replaced by LGA2011 probably in 1st quarter 2012 and no new things are coming out for LGA1366.
  16. For sure, thanks :D
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