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SLi PSU?

Discussion in 'Graphics Cards' started by MoNkEyMiKeY, 5 May 2006.

  1. MoNkEyMiKeY

    Mobster

    Joined: 17 May 2004

    Posts: 4,667

    Im about to get a second 7800GTX. Would this be ok for SLi with my rig or do I need something more powerful? Tagan TG430-U15 430W ATX2.01 Easycon SLi Compliant Modular Silent PSU (CA-007-TG)
     
  2. iGiDK

    Hitman

    Joined: 3 Mar 2006

    Posts: 984

    Location: Falkirk, Scotland

    I'd be inclined to go for something more powerful matey at least 500W IMO
     
  3. pastymuncher

    Man of Honour

    Joined: 12 Jul 2005

    Posts: 18,886

    Location: Aberlour, NE Scotland

    You are going to need more i am afraid. A single card recommends 450w but the Tagan is a quality psu so it may handle it.
     
  4. MoNkEyMiKeY

    Mobster

    Joined: 17 May 2004

    Posts: 4,667

    What about a hiper 580W?
     
  5. lay-z-boy

    Sgarrista

    Joined: 27 Sep 2004

    Posts: 9,231

    Location: Nantwich

    in a word, no

    they are not quiet and have large current droops under load, stick with the tagan.

    also, people who say you NEED a 500+w psu need to do some power usage reserch, i made an sli rig the other day for a friend using 7900gtx's and an x2 and it doesnt comsume more than 389w dual load and graphics loaded, and for the books i used a 430w easycon :).

    however, though it isnt needed i would advise it, the 480w tagan 2force or the seasonic 500w are superb choices.
     
  6. hp7909

    Soldato

    Joined: 8 Jun 2003

    Posts: 5,016

  7. lay-z-boy

    Sgarrista

    Joined: 27 Sep 2004

    Posts: 9,231

    Location: Nantwich


    so you will probably need a 1000w psu wont you, just to be safe :rolleyes:

    according to that i need a 570w psu, even though my rig doesnt consume over 400w at maximum load.

    that caclulator, imo is bs.
     
  8. man_from_uncle

    Wise Guy

    Joined: 9 Jan 2006

    Posts: 1,350

    The Hiper 580w has done the job in my experiance (in fact they sell themselves as SLi certified). I've got a friend running 2 7800gtxs with one. I am using one myself too and I fully expect it to handle 2 7900gts if and when i get a second.

    Not sure if they'd handle a high powered crossfire set up, but SLi shouldn't be a problem.
     
  9. fornowagain

    Sgarrista

    Joined: 3 Nov 2004

    Posts: 9,835

    Location: UK

    Just curious, how did you meter that?
     
  10. lay-z-boy

    Sgarrista

    Joined: 27 Sep 2004

    Posts: 9,231

    Location: Nantwich

    my 1200va ups
     
  11. DELETED_36704

    Wise Guy

    Joined: 14 Mar 2005

    Posts: 1,385

    Location: Cornwall

    Seasonic 500W best choice
     
  12. Memnoch

    Associate

    Joined: 19 Jan 2006

    Posts: 29

    I cant believe a system would ever consume 700W, mabe a huge server or a supercomputer but for a PC I think this is an exaggeration.

    What would a system need to consume 700W ??!
     
  13. MoNkEyMiKeY

    Mobster

    Joined: 17 May 2004

    Posts: 4,667

    Im going to see if my Akasa 460 can handle it with a molex to PCi-e adaptor. If not I'll be getting a proper PSU.
     
  14. MoNkEyMiKeY

    Mobster

    Joined: 17 May 2004

    Posts: 4,667

    Just did calculator myself and it said a 550w PSU.
     
  15. MoNkEyMiKeY

    Mobster

    Joined: 17 May 2004

    Posts: 4,667

    Ok Ive decided to get the tagan 580W TG530-U15. Ive found it for £77 inc P+P. But hey don't have any in stock at the moment so it'll have to wait for now.
     
  16. megatron

    Mobster

    Joined: 8 Nov 2002

    Posts: 4,208

    Location: Kent

  17. hp7909

    Soldato

    Joined: 8 Jun 2003

    Posts: 5,016

    Form that website, if you factor in 'compensation' & 'aging', any system will eventually consume more than stated. Besides, they do make 700w even 1100w PSUs, don't they? And it can't just be for nothing/futerproofing :confused:
     
  18. Akhamar

    Associate

    Joined: 25 Oct 2004

    Posts: 52

    I know it's been mentioned many times before in different ways but it does seem PSUs are a frequent topic:

    You don't buy a 600-1100w PSU because your system actually uses that much total, you buy one because you need higher power on specific rails, in this case you want higher 12v amps (watts).

    Thankfully this seems to be less of an issue now anyway with newer PSUs mostly having an increased share of the total watts on the 12v.

    I'd think a Enermax Liberty 500w or Tagan 530w would be fine for pretty much anything except a Crossfire or Quad SLI setup.

    A note again about the often mentioned Hiper PSU. To compare, the Enermax Liberty 400w looks to be equal to it in any system where 12v is the mainly used rail, ie. any new system.