Double chk 12v calculations?

[paulmforumz]

I am looking at this psu:

http://www.newegg.com/Product/Product.asp?Item=N82E16817182044

and this vid card:
http://www.newegg.com/Product/Product.asp?Item=N82E16814130017

psu statest the following:
12v1 @ 15a, 12v2 @ 16a
3.3v + 5v = 130w
12v1 + 12v2 +3.3v + 5v = 480w

So 480w -130w = 350w
350w/12v = 29 amp total on 12v

vid card states:
18amps
SLI mode = 24 amps

but how does all this work with the 12v rails (both with lower amps)? What does two 12v rails actually "do"? vs one 12v rail with 29amps?

 

[Valtiel]

Don't go with a Rosewill they are cheap power supplies. The fact that it is only $58 and very flashy only solidifies my judgement of it, the manufacturer has to skimp somewhere.

A better choice would be maybe the Corsair 520HX 520W Power supply although maybe if you provided me with a budget I could work out something cheaper, see as this particular PSU is $120 ?

http://www.newegg.com/Product/Product.asp?Item=N82E16817139001

FSP group makes great power supplies too. This will power your system it's combined amps being ~29A

http://www.newegg.com/Product/Product.asp?Item=N82E16817104954

And finally here is a midrange XClio PSU.

http://www.newegg.com/Product/Product.asp?Item=N82E16817189006

 

[Valtiel]

Trust mpilchfamily, I learned everything I needed to know about PSUs from him

 

[jaguarskx]

I am looking at this psu:

http://www.newegg.com/Product/Product.asp?Item=N82E16817182044

and this vid card:
http://www.newegg.com/Product/Product.asp?Item=N82E16814130017

The 7600GT uses very little power compared to many other GPUs out there. With the exception of the 8800GTS/GTX, nVidia GPUs consume substantially less power than thier ATI counterparts. In fact the 7600GT uses only 36w (3 amps) of power under stock speeds:

http://www.xbitlabs.com/articles/video/display/power-noise_5.html

Depending on the other components of your PC, a 300w PSU is more than capable of powering a "typical" PC with the 7600GT.

As mentioned before the, Rosewill PSUs are crap.

For a good, inexpensive PSU check out FSP Group (Fortron Source):

FSP Group (Fortron Source) AX400-PN - 400w - $44 + shipping

FSP Group (Fortron Source) AX450-PN - 450w - $54 + shipping

 

[Valtiel]

Haha I didn't know the 7600GT took such little power. That's kind of cool in a nerd sort of way.

 

[paulmforumz]

no,no. That was for "typical system" recommended amps if you use this card.

Since offer to help:

MOBO = am2/sli
chip = amd4800+
ram = 1gig pc800
card = 7600 (1 card for now)
drive = 1 hd
dvd burner = 1

any links on how to "add up" volt amps. prefer a 350 - 400peak volt psu. looking at case and psu with 12v1 +12v2 of 19amps. (their specs, not mine) and 5v+3v+12v1+12v2 total volt of 335.

 

[Valtiel]

you desperately need to read PSU 101 because it seems that you are very confused about how amps, volts and watts work. There is no such thing as a 350-400 Peak volt PSU. I find it very hard to understand your post :? .

 

[avarice]

May I suggest the Fortron FX600GLN - 600 Watts, 4-12V Rails at 18A each, and $110 after rebate.

I bought mine about 6 months ago - didn't have a rebate, and cost about $30 more. No regrets though - it is stable as heck.

For a few extra bucks - you can get the 700W version which is certified for 8800 Graphics in SLI mode.

I (kindly) challenge anyone to come up with anything bad on these two Fortron PSUs. Technically they are very solid - there may be minor points or preferences - but they are what they are - and they are very good.

This is just a suggestion/opinion - your best bet is to read the PSU 101 stickey, and to follow the reference links at the bottom of that posting.


Best of luck,

 

[paulmforumz]

Its a varying peak

Just kidding. Writing shorthand not working.

PSU is rated at 350watts with 400watt peak.
12v rail one = 14amps
12v rail two = 16amps

total combine current on both rails is rated at 19amp max.

yes I read psu 101. Still doesn't help with calculating what "your" or "my" system needs? Power calculator help for rough estimate.

 

[Valtiel]

Ah ok, sorry I just saw volt amps and I was like ???