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Thread: PSU +12v line amps and X1900XT

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    PSU +12v line amps and X1900XT

    Howdy.. I'm thinking about upgrading to an X1900XT from a 6800Ultra. Now, I've been hearing/reading that you need 30amps on your +12v line from the PSU to be able to run the X1900XT stable. My current PSU: Hiper Type R 580w has, according to the manual, two +12v's.. one labelled +12v1 and +12v2. +12v1 has a max of 20amps on it and the +12v2 has 18amps. Does that mean I have a maximum of 38amps on my +12v, or do I only have 20amps max.

    Anyone care to help me out with this query?

    Cheers
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    right well all i know is that i am running an x1900xtx on a seasonic 500W PSU if thats any help

    i get no power issues

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    You have split rails
    Some PSUs like Tagan can combine and split them depending on what you want, i dont think your PSU can, but have a check as im not 100% sure.
    It is a known "issue" with some PSU's, as the 30amps is needed off a single line. If your PSU cant do this, you may well run into problems.
    Quote Originally Posted by Saracen View Post
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    depends what you also have on each rail & therefore the current draw.
    Imo you should be OK but there's only 1 way to find out for sure ...

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    Pie_uk: Which Seasonic PSU model do you have? I checked the Seasonic website and it seems most Seasonic PSU's use +12v1 and +12v2 like mine does, so maybe there's hope for me and my PSU

    Agent: I've emailed Hiper about this, no reply just yet.

    http://www.hipergroup.com/English/pr...hpu-4k580.html << That's the PSU i have, dunno if anyone can see any info there which may be of use.
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    S12 500 real good PSU ! best ive had to this date

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    • The_Iceman's system
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    I've been wondering this also, please post back if you get a good answer Flakvin... I intend to pair up an X1900XT-X with the same PSU, my PC won't have loads of hard drives, fans or random accessories so I think this would be ok. Would be great if someone could clarify though.

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    hardly any modern psu's have a single 12v rail of 30amps - the ATX2 specs (I think thats the one) asks for 2 12v rails neither exceeded 20amps. I think the 30amps is a combined ampage for both 12v rails.

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    • Flakvin's system
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    Right well, I've taken the jump and ordered an X1900XT, so I'll either be very happy very soon or very pissed very soon (and out of pocket &#163;251). Info posted here and collected elsewhere shows I ''should'' be ok with this card and my Hiper PSU.

    I'll post what happens when the beast arrives.
    Last edited by Flakvin; 07-06-2006 at 11:01 AM.
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    Senior Member Dark Horse's Avatar
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    I've got my x1900xt clocked at 730/850 with max core/mem voltages on my hiper 480w so the 580w should be more than fine.

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    Yeah, my X1900XT runs fine overclocked to whatever it is this week and I'm using a 400W Zalman PSU, so I certainly wouldn't worry about it. I think a lot of the hype about power requirements appears to be over the top - either that or vendors are just hedging their bets and claiming huge demands so customers can't complain if they have problems running the things due to a cheapass power supply.

  12. #12
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    • Flakvin's system
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    Got the X1900XT today.. seems to run fine with the Hiper TypeR 580w PSU.

    Good stuff
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  13. #13
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    • Flakvin's system
      • Motherboard:
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      • CPU:
      • Intel Core i5 2400 @ 3.6GHz
      • Memory:
      • Mushkin Blackline DDR3 8GB 1600MHz
      • Storage:
      • Crucial M4 256GB SSD -- WD Caviar Black 640GB x2 RAID 0
      • Graphics card(s):
      • Powercolor Radeon HD7870 GHz Edition 2GB PCS+
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      • Operating System:
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      • Monitor(s):
      • Acer G276HLABid 27"
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    Extra little note, Hiper emailed me to let me know that the PSU has a maximum of 38Amps on the 12v+ rail... so, that's cool
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