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Help with +12v question

post #1 of 13
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I'm using this PSU http://www.newegg.com/Product/Produc...2bpower%2b650W

It has dual +12v each has 18A. What's is the MAX Amp for this PSU. Is it 28A or 36A? How do u calculate it. Will this be ok run 8800GTS in SLI?

Thanks in Advance.
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SL
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post #2 of 13
you can't just add the 12v rails...not sure how to calculate precisely, but I'd take an ~80% rule when adding them (so, 80% of each rail added together), so no more than 30A on the 12v rails
    
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post #3 of 13
Can't tell with this one.You don't just add the 2 rails,thats just the max you can put on that rail.They should tell you the max watts for the 12v rails and you use that figure to figure total max amps and the temp they're basing that on.From the efficiency rating of 70% and the missing info that is not even listed on their web site I'm skeptical of it's quality and available power.
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post #4 of 13
Quote:
Originally Posted by Silver_WRX02 View Post
I'm using this PSU http://www.newegg.com/Product/Produc...2bpower%2b650W

It has dual +12v each has 18A. What's is the MAX Amp for this PSU. Is it 28A or 36A? How do u calculate it. Will this be ok run 8800GTS in SLI?

Thanks in Advance.
That's a tough one, you can't find out for sure (as far as I know)
eXtreme Power RP-650-PCAR/PCAP ~NG (not given)
http://forums.guru3d.com/showthread.php?t=205763

How to calculate (if you can find out):
Maximum combined wattage on the combined 12v rails divided by 12 = amps

Just an example that you can't just add the 12v together:
My old Dell 305w psu
18a + 18a = 264w = 22amps
post #5 of 13
A quality 650 watt PSU should have 50+ amps on the 12v and be 80%+ efficient.
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post #6 of 13
I just checked my PSU, 19A on both rails, but is says max 36A on 12v total...that's not much loss there, so it all depends on the quality of the PSU maybe?

Quote:
Originally Posted by jameskelsey View Post
A quality 650 watt PSU should have 50+ amps on the 12v and be 80%+ efficient.
like PCP&C 610W...49A on 12v
    
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post #7 of 13
Corsair 620HX 50 amps
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post #8 of 13
Quote:
Originally Posted by Bazmecc View Post
I just checked my PSU, 19A on both rails, but is says max 36A on 12v total...that's not much loss there, so it all depends on the quality of the PSU maybe?



like PCP&C 610W...49A on 12v
19a + 19a = 36a is very good
The PCP&C 610w is going to be my next psu.
1 12v rail @ 49a
post #9 of 13
Quote:
Originally Posted by Silver_WRX02 View Post
I'm using this PSU http://www.newegg.com/Product/Produc...2bpower%2b650W

It has dual +12v each has 18A. What's is the MAX Amp for this PSU. Is it 28A or 36A? How do u calculate it. Will this be ok run 8800GTS in SLI?

Thanks in Advance.
8800 GTS's in SLI will need at least 24 amps just for the video cards,they draw up to 145 watts each.
So what you have ain't going to hack it.
Corsair 650 has 51 amps I think
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post #10 of 13
eVGA recommends at least 30A on the 12v rail(s) total
    
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