18 amps on the 12 volt rail

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PotGuy

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I just had a worrying thought. The spec of the system i'm building includes:

Athlon 4000+
xfx 7800gt/6800gt/radeon x1800xl (not sure how far i can stretch my budget yet!)
2x Hitatchi t7k250 hard drives
1x optical drive
1x floppy drive
Asus a8n-sli premium

but I've just realised that i only have 18 amps on the 12 volt rail of my psu (thermaltake butterfly 480w) and i have read that many people recommend 20-22 amps on the 12 volt rail for high end gfx cards. I was just wondering if 18 amps is enough.

Cheers guys
 
I think you are going to struggle with that spec as the PSU is a little on the small side. OK for P4 but not a kick a$$ AMD.

I recomment a TT PurePower 560 ( W0023R )


J.
 
ah but i've already bought it :( you sure it won't do or will i have to replace it :(
 
I'd have thought it would be enough, as I've got an X850XT which uses quite a bit of power and have a similar power supply. I've not used a 4000+ though so could be wrong - someone here might be using one though.
 
Ive had a scout around and admittedly, I found a couple of higher pc specs running happily on 480w PSUs such as Antec. But I always suggest at least 500w PSU's for specs similar to yours.

If any 480 is going to do it, I suppose your butterfly is going to.

check out http://stores.tomshardware.com/rating_getprodrev.php/product_id=3996876/id_type=M// for another opinion.

edit: sorry meant to add, it's the second post in the thread.
 
that should be plenty, i cant remember exactly but i only needed about 10 for my system when im using everything, you'll probably need 16 max
 
Ah good thanks guys. I wish i hadn't bought it already - that ocz looks awesome! But ah well. Just wanna make sure that I'm not going to put it all together just to have to rip out the psu and spend a bundle on another :P

Cheers
 
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