Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > Power supply enough for 4850?
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iicsus   06-24-2008 at 06:41:16 PM

I'm thinking of buying a 4850 when it's gonna be available over here, but i'm not so sure that my PSU can handle it. From what i've read i understand that the 4850 has a TDP of 110W, about the same as a 8800GT, but i don't know how many amps are enough on the 12V rails. My PSU is a Thermaltake 420W, with 25A on the 12V rails and i only have one HDD, one DVD-RW, 2 case fans, not really a power hungry system. So will a 4850 run fine or should i go with a 9600GT?

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aevm   06-24-2008 at 06:56:11 PM
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An 8800GT needs 22A. I'm sure your HD 4850 will be fine with that PSU.

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Bronze CPUs badge WR2   06-24-2008 at 06:59:14 PM
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I agree with avem - you should be good to go.
The Sapphire site recommends a 450W PSU but doesnt list any Amperage suggestion. http://www.sapphiretech.com/us/pro [...] p?gpid=244
Im sure they're allowing for some 450W budget PSUs that are weaker on the +12V rail than yours.

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aevm   06-24-2008 at 07:03:42 PM
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On second thought, that PSU has a 15A and a 10A rail, so combined they are not really 25A, more like 20A..22A I'm guessing. I should have checked before posting, sorry...

Still, considering that the rest of the system is really minimal, I think it should work.

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iicsus   06-24-2008 at 07:04:07 PM
- 0 +

Ok then, i'll probably go for a HD 4850 if the prices will go down (right now it's over 200$ and not even in stock). This is the link for the PSU: http://www.thermaltake.com/product [...] 006162.asp

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pcgamer12   06-24-2008 at 07:04:43 PM
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Nvidia recommends 26 amps for 8800gt and a 400w psu. People have got by with less, 25a seems safe.

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pcgamer12   06-24-2008 at 07:05:39 PM
- -1 +

He has 25 amps total on 2 rails. nuff said.

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