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HELP: Ghetto-rigging PSU

post #1 of 11
Thread Starter 
So I am helping my brother-in-law with a pieced-together system with the specs below:

--P4 (3.0Ghz)
--1Gb DDR2 (PC5300)
--40Gb hard drive
--X1900XT
--250-350W PSU (Don't know which)

The PC was free from another venture, and I had the GPU sitting around.


However, if you are into PC gaming at all, you probably know that the PSU is pathetically underpowered for the graphics card. ATI recommends at least a 450W psu for the card and P4's (probably a prescott) are notoriously power-hungry.

I have a solution in Milwaukee: one of the FSP dedicated GPU PSUs. it has been laying in my apartment for some time and it should work fine to supply the power.


BUT I am in ILLINOIS now and would like to show the machine to my brother-in-law.


My question is this: Can I use a second 250W power supply from another computer, use the following (http://www.ochardware.com/articles/p.../psuvolt2.html) technique to turn it on without being connected to the second computer, and use it as a dedicated PSU until I get the FSP?

I am wondering if the one might be at a different potential than the other, burning something up.

The more I think about this, the more harebrained it sounds....
    
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post #2 of 11
LMAO! 250 watts is enough for that. People are running 8800GT and cor2duos on 300 watts. You should be fine
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post #3 of 11
Thread Starter 
Meh, for whatever reason its not working very well at all. I might put it in a system with a more powerful PSU for testing.

The thing is, after about 10 minutes of play, it starts artifacting really bad. I had this same problem before when I first got my X1900 and it was because of having too low of a PSU, so I figured it was the same thing.

I will probably do some more testing and see how it works out.
    
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post #4 of 11
Quote:
Originally Posted by killnine View Post
Meh, for whatever reason its not working very well at all. I might put it in a system with a more powerful PSU for testing.

The thing is, after about 10 minutes of play, it starts artifacting really bad. I had this same problem before when I first got my X1900 and it was because of having too low of a PSU, so I figured it was the same thing.

I will probably do some more testing and see how it works out.
I would suggest a new PSU. You said it best in your first post. I used a $22 HEC psu from newegg on a similar build to yours and it worked great. I will dig up a link for you.


http://www.newegg.com/Product/Produc...82E16817339019
Edited by corky dorkelson - 12/23/08 at 8:31am
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post #5 of 11
There is an OCZ StealthXStream 500w for $25 AR + free ship on Newegg.
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post #6 of 11
Yes, you can use two seperate PSUs without any problems. Obviously try to not make everything too overly complicated. Maybe just use the 2nd PSU for the Graphics Card only.

Although, one PSU should suffice for the entire system. Its always worth trying it with one PSU, stress testing it and you may find it will all work 100%.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by jinja_ninja View Post
Yes, you can use two seperate PSUs without any problems. Obviously try to not make everything too overly complicated. Maybe just use the 2nd PSU for the Graphics Card only.

Although, one PSU should suffice for the entire system. Its always worth trying it with one PSU, stress testing it and you may find it will all work 100%.
yeah, I know it doesn't work full-out currently. I can play portal maxed out for about 10 minutes, then artifacts pop up and the thing crashes with BSOD.

I am using ATI Tray Tools right now to underclock the thing to 630/700 and it plays great.

The thing is so CPU-bound anyway (with a 3.0Ghz P4) that I dont think the underclocking matters.

+reps all around.
    
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post #8 of 11
Quote:
Originally Posted by killnine View Post
yeah, I know it doesn't work full-out currently. I can play portal maxed out for about 10 minutes, then artifacts pop up and the thing crashes with BSOD.

I am using ATI Tray Tools right now to underclock the thing to 630/700 and it plays great.

The thing is so CPU-bound anyway (with a 3.0Ghz P4) that I dont think the underclocking matters.

+reps all around.
You may also want to monitor the temp of the vid card. Heat can cause artifacts and BSODs. Use CPU-Z to monitor temps while you are playing, and then alt+tab out of the game to see what the temp is.
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post #9 of 11
yea you should be able to use 2 psu's in that rig. the question is where do you want to put the second?

i have a Ultra 325w power partner if you want
$25.00
http://www.tigerdirect.com/applicati...091&CatId=1077

But yea you would be able to take that second psu and jump it like that, but if it were me instead of using a jumper i would just link it to a switch so i can turn it on in the front of the case
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post #10 of 11
I ran a 8800gt on a spare PSU like that for a while and it worked ok for folding. I never gamed on it but folding does run the card at 100% I believe and thats 24/7 for a week at a time maybe.

I don't know maybe your spare PSU is just too little to run that 1900x. However I do know it can work if the PSU can handle the card lol. My spare was a 450w.
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