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8800GT Power Problem

Forum Graphic & Displays : Graphics Cards - 8800GT Power Problem

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umeshnk   03-24-2008 at 04:46:17 AM

Hi,

I'm planning to buy a ASUS 8800GT this week. I have a 450W PSU. Will it be enough to power my 8800GT? Please help.

I currently have

E6550
1x 1600XT
2x HDD
1x DVD-RW
2x Fans

------------------------------ E6550@2.80GHz, ASUS P5K, ASUS EAH4870 512MB, Kingston 4GB (PC2-6400) , SAMSUNG HD322HJ 320GB x2, Creative SB Audigy Value, Creative Inspire M5500 5.1,COOLER MASTER eXtreme Power RP-650-PCAR 650W
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stridervm   03-24-2008 at 05:32:46 AM
- 0 +

Yeah, maybe.

If you don't have much extra things in your system. It should. If I remember, I done exactly that in a PSU calculator and it ended up something close to 350W.

Reply to stridervm
randomizer   03-24-2008 at 05:48:07 AM
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Which 450W? Details friend, details.

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 Reply to randomizer
umeshnk   03-24-2008 at 05:48:32 AM
- 0 +

Thanks for the reply. I used a PSU calculator and found out that my pc needs just below 350W. Is there an advantage if I get a higher power PSU?

Reply to umeshnk
randomizer   03-24-2008 at 05:53:35 AM
- 0 +

Yes, because that 350W is almost all drawn on the 12V rail, and your PSU can't supply 450W on the 12V rail (otherwise there is none left for the other rails). You need to tell us what PSU you have.

Message quoted 2 times
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 Reply to randomizer
lunyone   03-24-2008 at 06:05:35 AM
- 0 +

randomizer wrote :

Yes, because that 350W is almost all drawn on the 12V rail, and your PSU can't supply 450W on the 12V rail (otherwise there is none left for the other rails). You need to tell us what PSU you have.


Exactly what I was going to ask. Not all 450w PSU's are built the same. If you have a high quality one, than you might be fine. If you have a junk 450w PSU than you'll have problems.

------------------------------ PSU Tiers
GPU Power
8800gtx w/e6600 OC'd will run on Antec 380w w/27A on 12v rail, PSU!!
 Reply to lunyone
crusoe74   03-24-2008 at 02:21:36 PM
- 0 +

randomizer wrote :

Yes, because that 350W is almost all drawn on the 12V rail, and your PSU can't supply 450W on the 12V rail (otherwise there is none left for the other rails). You need to tell us what PSU you have.



I'd think the 8800GT will need between 20 and 24 amps on the +12v rail and some cheap 450watt PSU's won't supply that.

Reply to crusoe74
dev1se   03-24-2008 at 02:23:54 PM
- 0 +

It would be nice if people gave answers.

Message quoted 2 times
Reply to dev1se
crusoe74   03-24-2008 at 02:27:15 PM
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dev1se wrote :

It would be nice if people gave answers.



It's also be nice if the OP were to give us a bit more info IMO. Crappy 450w PSU may only be able to deliver 18a so he won't be able to power his 8800GT. Quality ones would probably provide 30a+ on dual rails.

Reply to crusoe74
jay2tall   03-24-2008 at 03:16:08 PM
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[quotemsg=1801493,9,299977Crappy 450w PSU may only be able to deliver 18a so he won't be able to power his 8800GT. Quality ones would probably provide 30a+ on dual rails.[/quotemsg]
Correct. We need the Brand/Model PSU to give an answer.

You can't look at a car and say OH YEAH IT'S FAST, SEE IT HAS A WING ON THE BACK. You have to look under the hood and say, oh look a stock 1.8L it sucks.... oh wait a Cold air intake... Yup still sucks.

------------------------------ Big Brother Rules with an Iron Fist
 Reply to jay2tall
randomizer   03-24-2008 at 11:32:06 PM
- 0 +

dev1se wrote :

It would be nice if people gave answers.


Oh the irony of that post :sarcastic:

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 Reply to randomizer
crusoe74   03-25-2008 at 12:18:28 AM
- 0 +

randomizer wrote :

Oh the irony of that post :sarcastic:



Indeed

Reply to crusoe74
kshipper   03-25-2008 at 12:56:52 AM
- 0 +

I have tried several budget 350w to 450w PSUs. Some come with the case and I have also tried FSP brand. All of them failed to power the 8800GT. I have had great success with the Enermax Liberty 500 ($100-$150). Beware that the 8800GT is gen2 card so I have run into motherboards that don't work at all with the 8800GT and the problem you get looks like a PSU problem. (just a heads up )

Reply to kshipper
umeshnk   03-26-2008 at 02:03:30 AM
- 0 +

I think I need to buy a PSU..Mine is a crappy one from Mercury.

Reply to umeshnk
story4ever   03-26-2008 at 02:41:56 AM
- 0 +

I use the one with case and works great. Antec NSK6500 only 430W PSUs power up Q6600, MIS 8800GT OC, two HD Maxtor 500 & 320., 4gb ram and samsung dvd 20X. Still I think you should buy a good brand PSU la.

story4ever

Reply to story4ever
jaydeejohn   03-26-2008 at 03:17:45 AM
- 0 +

OK, some psus give an all out potential added amount of wattage, meaning that there are 3 primary voltages 3.3 5 and 12 volt . A crap psu may give results like on the 3.3V 100 watts 5volt 100 watts 12 volt 300 watts. Now you maythink thatll all add up to 500 watts, and some crap psus make this claim, when in reality the total maxxed out wattage using all three voltages come to only 400 watts. The problem is, that the max amount at a given instant for any of these voltages can only be applied for one particular voltage at a time, thus leaving the say 12 volt with less power than is needed when the 5 volt is maxxed out. Good psus will show a minimum amount always available, but still may show total amount, say 3.3 volt 150 max 5 volt 150 and 12 volt 400 max, but it will only provide a total of a little over 500 total watts, and then the better psu will sell it as a 500 watt psu. Hope this makes sense heheh

------------------------------ I went drifting, thru the capitols of tin, where men cant walk and cant freely talk, and sons turn their fathers in
 Reply to jaydeejohn
umeshnk   03-26-2008 at 04:37:49 AM
- 0 +

Is there I can measure those outputs. PC Probe shows only voltages which is pretty stable @ 3.3v,5v and 12v. Can somebody mention a quality but not very expensive PSU for me. We have ASUS P-55GA in our local stores which costs around $120.

Reply to umeshnk
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