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Is My PSU enough to handle another Graphics Card? {(!URGENT HELP!}) - Page 2

post #11 of 27
Quote:
Originally Posted by ProXStyler View Post

Umm im pretty new to the computer world and i dont know much about power supplys but the PSU u suggested me is only 50 watts more so does that mean another 50 watts will be enough for me?
Look at the amperage of the 12v rail rather than the watts. That is what the posters are saying. Look at it this way, most of your heavy components are using the 12v rail (CPU, PCIE). Your PSU basically lies when it quotes the max watts, because if you take the 12v*15A = 180W, meaning between all your heavy units your PSU can actually only put out 180W... That is why the 12v rail amperage matters so much.
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post #12 of 27
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

Look no further: http://www.overclock.net/t/183810/faq-recommended-power-supplies/0_30
smile.gif

ily
post #13 of 27
Quote:
Originally Posted by tompsonn View Post

Yes and there is 45.5 amps on the single 12V rail smile.gif Which is far better than the paltry 15 amps with that Thermaltake.
The Thermaltake is also only really rated for about ~400W (500W is peak at any one time) vs ~550W+ continuous from the Rosewill.

I don't know if it would even be a 400 watt in reality...by math yes...it is a 402watt PSU by the math.

Really all that is important is the 12v rail size. Cheaper power supplies like that thermal take will beef up the 3.3v and 5v rails so the math will add up to look like it is a 500w power supply. However you will never use 25 amps on those rails...maybe like 5 at the most.

Take a look at this PSU
...not recommending it for your setup, but see how it is only rated at 360watts yet has 30 amps on the 12v rail? The 3.3 and 5v rails are small though, but still large enough to meet any need a computer might have on those rails.

I would go with a psu with a +12V rail of at least 36 amps...or a dual 12v rail of about 18 amps a piece. Ignore the wattage for the most part...the wattage is just sum of products of the amps * voltage and the only voltage that is important is the +12v
Edited by Vagrant Storm - 9/7/12 at 7:59am
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post #14 of 27
Quote:
Originally Posted by Vagrant Storm View Post

I don't know if it would even be a 400 watt in reality...
Really all that is important is the 12v rail size. Cheaper power supplies like that thermal take will beef up the 3.3v and 5v rails so the math will add up to look like it is a 500w power supply. However you will never use 25 amps on those rails...maybe like 5 at the most.

Take a look at this PSU
...not recommending it for your setup, but see how it is only rated at 360watts, but yet has 30 amps on the 12v rail?

Man no kidding... I'd have a hard time powering two fans off that thing... Not even sure how one 7770 + CPU + et al is chugging along!
28A on +5V is freakin' stupid.
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post #15 of 27
Thread Starter 
Quote:
Originally Posted by tompsonn View Post

Man no kidding... I'd have a hard time powering two fans off that thing... Not even sure how one 7770 + CPU + et al is chugging along!
28A on +5V is freakin' stupid.

MY PSU

DC Output- +3.3v / +5v / +12v1 / +12v2 / -12v / +5Vsb
Max Output- 25a / 28a / 14a / 15a / 0.3a / 2.0a
Min Output- 0.5a / 0.3a / 1a / 1a / 0.0a / 0.0a

These are the side of my PSU just incase
post #16 of 27
Quote:
Originally Posted by ProXStyler View Post

thank you very much it would be nice if you could tell me a thing or two on this PSU thing and how can i choose one

Look for a quality 400w psu for crossfire 7770s and a FX-8120 in the thread tompsonn linked.

Quote:
Originally Posted by tompsonn View Post

Look no further: http://www.overclock.net/t/183810/faq-recommended-power-supplies/0_30
smile.gif
    
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post #17 of 27
Quote:
Originally Posted by ProXStyler View Post

MY PSU
DC Output- +3.3v / +5v / +12v1 / +12v2 / -12v / +5Vsb
Max Output- 25a / 28a / 14a / 15a / 0.3a / 2.0a
Min Output- 0.5a / 0.3a / 1a / 1a / 0.0a / 0.0a
These are the side of my PSU just incase

14A on +12V1 and 15A on +12V2? lachen.gif Go home Thermaltake!
Pick up a new PSU buddy, your hardware will thank you for it smile.gif
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post #18 of 27
Thread Starter 
Righteos
post #19 of 27
Highly recommending that Rosewill I linked smile.gif Cheap and will be 100x better for you!
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post #20 of 27
Quote:
Originally Posted by ProXStyler View Post

MY PSU
DC Output- +3.3v / +5v / +12v1 / +12v2 / -12v / +5Vsb
Max Output- 25a / 28a / 14a / 15a / 0.3a / 2.0a
Min Output- 0.5a / 0.3a / 1a / 1a / 0.0a / 0.0a
These are the side of my PSU just incase

That is different than the one linked...it is better, but not good enough for the crossfire. heh, I was wondering if it the linked one was even able to power a 7770 and a 8120.

Though this PSU would be fairly safe for you single card. I say fairly safe because Thermaltake PSU are not known for quality. Though it depends on the model. There are some models that are rebadges of other makes and end up being decent. Provided it was working well, the voltage would be good for the CPU and one GPU...but not two GPUs
Quote:
Originally Posted by tompsonn View Post

Highly recommending that Rosewill I linked smile.gif Cheap and will be 100x better for you!

Yeah I would go with that one too...I might have bookmark that one. I don't associate Rosewill with high quality, but they are decent; better than most anyway. However, if it is a rebadged Super Flower I am all over it.

Yep...appears to be manufactured by Super Flower.

Edited by Vagrant Storm - 9/7/12 at 8:19am
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