PSU too small?

[akramar]

I have a 450W PSU from Chieftec. I upgraded my graphics card from Geforce 7200GS to 9800GT and now the problem started. After ten minutes of full load (3DMark) i get a long beep and the computer restarts. I tried opening case door to rule out overheating but no help. The graphics card has no speaker and case speaker sounds different so it has to be PSU speaker. The rest of my rig is:

C2D E5200
2GB DDR2-800
750GB Seagate
DVD-RW
Sound, TV card.

Shouldn't this PSU be sufficient?

 

[pr2thej]

Got a link to that PSU? Cant find the specs. You need 26A on the 12v rail for it to be effective though.

 

[pr2thej]

If its Chieftec SMART series GPS-450AA -101 A then it does not have enough to power the card.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010320058%2050009830%20113142554&name=401%20-%20500W $45 after MIR hihi!

 

[akramar]

Yes, thats the one. But combined power on 12V is 29A (14+15).

 

[pr2thej]

Sometimes it isnt as easy as just adding them, depends on the manufacturer...theres a few calculations so im told.

Standard calc - (14*12) + (15*12) = 348w. Add the 145w that are on the 3.3 and 5 and you got 493w which exceeds the PSU's total output so i wouldnt assume you are getting full power off the 12v's anyhoo.
Either way, as i understand it (correct me if im wrong someone please!) one of those rails is for CPU only, and the other is for everything else requiring 12v rail.

Get a second opinion either way, i must admit im no PSU whore so just hang around for someone to confirm that. (im curious to know if i worked that out right as well )

Its either that, or a fault on your GPU, which i doubt. Could always test the GPU in a mates rig to rule that out though. Nice AV btw

 

[akramar]

OK, thanx. I'm replacing this PSU and buying 550 or 600W.

 

[toxy]

i have this sytem

Intel Q9550
Evga 9800 GTX +
4G DD2 1066
HDD 750 Gb
P5N-T-Deluxe

t he guy from the shop had offer me this power source Allied 400W ALLIED-400W-SE and he sad that its enough should i believe him or not? please help me whit this issue before i'l buy this power source.

 

[akramar]

I would not go with less than 550W. See my problem in above post with 450W.

 

[Onus]

Well toxy, when you start your own thread, I'm sure you'll get useful responses.

 

[pr2thej]

The guy in the shop is a fool. Typical of OEM to go cheapy on a PSU.