18A good enough for x1900Xt 256?

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silverphoenix

Gawd
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Feb 15, 2006
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I have a trupower II 480, and according to antec's site it can provide 18A each rail. Is that enough to power the x1900xt?
 
what is the rest of your system? should be fine though.
 
A64 3000 running at 1.55V, 1 sata hdd, A8N-E, 2x 120mm fans antec, 1x 512ddr ram stock volts, and a dual layer burner.
 
lol, I have a x1900aiw overclocked and a 90nm pentium D at 3.4GHz on a psu with 1x 18a 12v rail. you should be fine
 
silverphoenix said:
A64 3000 running at 1.55V, 1 sata hdd, A8N-E, 2x 120mm fans antec, 1x 512ddr ram stock volts, and a dual layer burner.
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looks good to me, the X1900XT 256mb is a great card. have fun with it. i will need to grab one but waiting to see if prices will fall come october.
 
silverphoenix said:
with the prices of ram these days...
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I think you should worry about your ram more than anything else...

You need @ least 1.5gigs to play recent games fluid...
 
rcf1987 said:
Ram and a cpu the a64 3000 isn't what it used to be
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Speak for yourself... :D You have athlon xp2400 on a A7V

a64 3000 is plenty enough... Just overclock a little...
 
Marvelous said:
Speak for yourself... :D You have athlon xp2400 on a A7V

a64 3000 is plenty enough... Just overclock a little...
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I know my cpu sucks but I think as soon as spring of 07 comes around that a64 will be just like my 2400xp
 
rcf1987 said:
I know my cpu sucks but I think as soon as spring of 07 comes around that a64 will be just like my 2400xp
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But he's not on a a7v... it's a Nforce 4... much better performer than a7v...

a64 can still push a 1900xt... No problem..
 
Marvelous said:
Speak for yourself... :D You have athlon xp2400 on a A7V

a64 3000 is plenty enough... Just overclock a little...
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It's already oc'ed stable at 2556mhz, my superpi times dropped from 1:03 to :36 sec
 
so...if a psu says it has 18 amps, it actually has 36? is this because of the safety/standards that require two 12 v rails? need quick answer plz!

It's either 7900GS for me, or if my fortron 450 watt psu (18 A on 12V) can take it, the x1900xt 256 mb...which im thinking is much better :)

-Ashley
 
^ how many 12volt rails does ur psu have? if its got 2 x 12v then u probably have 2x 18amps on each = 36amps in total. but but anything above 14-15amps on a single rail is enough to power the card- providing nothing else is running off the same rail- like a splitter etc.
 
Dual rails are additive

Use 1 rail for the CPU/Mobo/RAM/Fans (whatever is powered by the motherboard) - 1 rail is the ATX connector, while the other rail gets whatever is directly connected I believe, like a PCI-e or Molex connector. Not sure exactly how it works but it's something like that.

However if the card requires 24A or something to run efficiently, that may be a problem then.
 
I have the exact same question except that I have an Antec Neopower 480w so I thought I might just post in this thread. The rest of the system will be an E6600, 2gb ram, 2x DVD drives, 1x SATA, 2x 120mm fans, and Audigy 2zs.
 
You cannot add 2 rails to make a whole unless its a bridgeable psu. Just because they give out the same voltage does not mean they are combined(a single rail). Sure you have 36amps total for both rails but you only have a max of 18amps per rail so if you have something that wants 20amps your only gonna be able to feed it 18.


Im running an x1800xt 512mb on my psu with 12v@18amps (shared with everything else) and its shit. Rivatuner and atitool tell me its trying to draw 27-30amps in 3d mode and 10amps in 2d mode. If I hook up an older psu thats 250w with 13amps on the 12v for just the video card II get an added 30 fps in every game.
 
That's not right. First off, an X1800 XT (or any card's) power draw is not even close to 17-20 A, much less the difference between idle and load. Second, insufficient power to cards doesn't cause a drop in performance, it will cause them to simply not work. There must be some unrelated factor causing the performance difference.
 
arthur_tuxedo said:
That's not right. First off, an X1800 XT (or any card's) power draw is not even close to 17-20 A, much less the difference between idle and load. Second, insufficient power to cards doesn't cause a drop in performance, it will cause them to simply not work. There must be some unrelated factor causing the performance difference.
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I guess rivatuner and atitool lie. When monitering the draw its more constant with the 250w 13amp and all over the place with my 18amp shared with everything. It works it just doesnt work 100%. I would like for you to read up on how much power it takes because I have spent 20+ hours reading different things on what people think.
 
wow, I run a x1900 aiw and pentium D smithfield on a single 18a rail. Dual 18a rails with an a64 is more than sufficient.
 
S0m30n3 said:
I guess rivatuner and atitool lie. When monitering the draw its more constant with the 250w 13amp and all over the place with my 18amp shared with everything. It works it just doesnt work 100%. I would like for you to read up on how much power it takes because I have spent 20+ hours reading different things on what people think.
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If your programs are telling you that it's drawing 10A at idle and 27A at load, then yes, they're lying to you. No video card draws that much. Even Crossfire XTX's aren't that hungry.
 
S0m30n3, the amps ATITool is telling you are at core voltage (~1.425V), not 12V. Don't worry, your psu is fine (EDIT: Just realised you only have 1 rail, that is not so fine...).

You so need a new psu its silly. I hope you have your gpu running off that dedicated psu, as otherwise you are just supplying dirty power to your whole system.

Edit: Major LOL moment! If you were using 30A @ 12V, your card would be using 360W!!!!! That is definitely not the case (at least this gen anyway).
 
rcf1987 said:
Ram and a cpu the a64 3000 isn't what it used to be
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The A64 3000+ overclocked is plenty to push a x1900 xt.

There isn't a single game I can't play great with A64 @ 2520 mhz.
 
silverphoenix said:
I have a trupower II 480, and according to antec's site it can provide 18A each rail. Is that enough to power the x1900xt?
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3xHard Drive
2x Optical
Audigy + Breakout
Lots 'o fans
A64 3200+ @2.7
x1900xtx 512MB
Antec Trupower II 480
No Problems
 
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