PSU +12v line amps and X1900XT

[Flakvin]

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

[Pie_uk]

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

[Agent]

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.

[BUFF]

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 ...

[Flakvin]

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.

[Pie_uk]

S12 500 real good PSU ! best ive had to this date

[The_Iceman]

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.

[YorkieBen]

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.

[Flakvin]

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.

[Dark Horse]

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.

[Barkotron]

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.

[Flakvin]

Got the X1900XT today.. seems to run fine with the Hiper TypeR 580w PSU.

Good stuff

[Flakvin]

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