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How do I read the 12v rails?

post #1 of 11
Thread Starter 
I read the sticky up there, but honestly.. it comes down to a tl/dr.

I have an Antec 750 TPN and a gtx470. Now, if I'm reading it right, my psu shouldn't even power my card at all, and it does. The card recommends 38a on the 12v rail, and my psu has 4 12v rails @25a each. Not sure what this means. I'm wanting to add another 470 for sli, but really trying to figure out of the psu can handle it or not. Most people tell me it can, but I'm not even seeing how it powers the one card.

This is the PSU:

http://www.newegg.com/Product/Produc...82E16817371022
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post #2 of 11
You'll be fine I'm running an Antec TP-750 and I can run two 560s SLI and that's just recommended Amperage you'll be fine...
post #3 of 11
Your PSU automatically distributes the load across the "rails" (which is 62A total)/ not all of the PCI-E connectors are on the same rail. And that 38A figure is recommended for the whole system, not just the card itself. The card itself would consume around 17A at full load.

Your PSU is fine for another 470.
Edited by GameBoy - 7/24/11 at 7:10am
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post #4 of 11
Quote:
Originally Posted by GameBoy View Post
Your PSU automatically distributes the load across the "rails" (which is 62A total)/ not all of the PCI-E connectors are on the same rail. And that 38A figure is recommended for the whole system, not just the card itself. The card itself would consume around 17A at full load.

Your PSU is fine for another 470.
This^
post #5 of 11
Thread Starter 
Thanks. I know people tell me it's fine and all that, but I like to know why it's fine for future reference. The sticky kinda reads like german to me. Just want to avoid an atomic fireball in my case at some point.
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post #6 of 11
There's nothing to worry about, as single rail and multi rail PSU's work 99% identically. The only difference is the way the OCP (Over Current Protection) circuit is configured.
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post #7 of 11
Thread Starter 
This all comes from the day I learned my lesson. Had a rig with an athlon dual core in it, and an 8600gt. I decided to upgrade to a 9800gtx, and had a cheap 500w PSU in it (all that the card recommended was 500w). Didn't even realize brand made a difference at that time.

The card came with CoD: WaW, so I installed it and starting playing it. 10 minutes into the game, it sounded like a gunshot went off in my room, and everything powered down. Then, I smelled ozone, and smoke.

Never again.

*edit*

How much OC'ing room do you think I'd have in SLI? My cpu is @4.0ghz
Edited by Droogie - 7/24/11 at 7:36am
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post #8 of 11
You're getting close to 750W, possibly exceeding it in a super worst-case scenario stress test if you run another GTX 470 with those same overclocks. Note that a quality power supply like the TPN 750W can supply more power than its rated capacity, just not for long term use, so there's a small buffer there anyway. In any kind of normal usage including heavy gaming, 3DMark, etc. it should be fine.

I think unlocked GTX 465 probably take a little more power than real GTX 470 at the same speeds (binning out the leaky parts), but it's probably not too significant.
post #9 of 11
Thread Starter 
Quote:
Originally Posted by mikeaj View Post
You're getting close to 750W, possibly exceeding it in a super worst-case scenario stress test if you run another GTX 470 with those same overclocks. Note that a quality power supply like the TPN 750W can supply more power than its rated capacity, just not for long term use, so there's a small buffer there anyway. In any kind of normal usage including heavy gaming, 3DMark, etc. it should be fine.

I think unlocked GTX 465 probably take a little more power than real GTX 470 at the same speeds (binning out the leaky parts), but it's probably not too significant.
I've had it @850 stable with 1.087v. Not worried about this card.
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post #10 of 11
Quote:
Originally Posted by Droogie View Post
I've had it @850 stable with 1.087v. Not worried about this card.
with the tpn im sure it can handle your cpu at 4ghz and prob something like 1.1v on the cards easily
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