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Amps needed on 12v rail for 6800's?

post #1 of 11
Thread Starter 
I'm curious and cannot find the specifications on min requirements on amps needed on the 12v rails on power supply?

GTX 460 - 450 watts 12v rail with 24Amps current min requirement.
GTX 470 - 550 watts 12v rail with 38Amps current min requirement.
GTX 480 - 600 watts 12v rail with 42Amps current min requirement.
GTX 570 - 550 watts 12v rail with 38Amps current min requirement.
GTX 580 - 600 watts 12v rail with 42Amps current min requirement.

I have 12v rail with 36Amps current. So I can only run the GTX460. I'm currently running an AMD 6870 which is comparable to the GTX460 and am doing fine. I'm not sure if I could run the 6950 or 6970.

Anyone know what the amps requirements are on the 6850, 6870, 6950, and 6970? I can't find those requirements anywhere on the AMD site.
     
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post #2 of 11
http://www.sapphiretech.com/presentation/product/?psn=0001&pid=496

6870, looks like ~12.5A per card. I'll look for the rest of the family...

@OP, I'm assuming this isn't your sig rig PSU, but you should leave more than 2A for the rest of the 12v system, ie fans, HDD, ODD, anything else that you have on a molex. What else is in this rig?
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post #3 of 11
Quote:
Originally Posted by Arizonian;11995387 
I have 12v rail with 36Amps current. So I can only run the GTX460. I'm currently running an AMD 6870 which is comparable to the GTX460 and am doing fine. I'm not sure if I could run the 6950 or 6970.

The BFG EX 1000 Watt provides 82A on the combined +12v.....

You can run any 2-3 video cards on that PSU.
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post #4 of 11
@OP, what is the PSU you're asking about, as Duckie and I touched on, if there's only 38A on the rail, it's important to see what else is in the system to avoid overloading; and if it's the BFG, you can run multiple cards without concern. Please clarify the PSU in question so we can be more specific smile.gif
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post #5 of 11
Thread Starter 
On the fixed wire I got everything in "My System" running on it you see below including two 200mm Coolermaster Flowmaster top and bottom fan - one 140mm Promiltech Vortex side fan - and one 120mm Coolermaster back fan.

So far nothing on the modular cables. If my rating is 36A is that per wire? Or system as a whole? I don't know too much about power supplies amps.

Thanks for the help.
     
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post #6 of 11
You're asking for AMP info on a 1000w PSU? I don't think you even need to smile.gif
Edited by Raven.7 - 1/13/11 at 7:08pm
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Raven.7;12002905 
You're asking for AMP info on a 1000w PSU? I don't think you even need to smile.gif

I'm thinking about upgrading to two AMD 6950 or 6970's instead of a crossfire the 6870's.

I don't understand the 36a on the 12v wire that shows in it's specs for my BFG 1000 EX.

For example could I run one GTX 580 if requires 600 watts 48amps if my PSU is 36amps? I guess I don't understand what that exactly means. I couldn't find any of the required amps for the AMD's.

The 6870's ad 6850's I believe are 24amps in line with the GTX 460 but I couldn't find any specs.

Didn't want to order something from NewEgg that I couldn't use or refund. If someone could explain this to me I'd really appreciate it.

Thanks again.
     
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post #8 of 11
Quote:
Originally Posted by Arizonian;12002880 
On the fixed wire I got everything in "My System" running on it you see below including two 200mm Coolermaster Flowmaster top and bottom fan - one 140mm Promiltech Vortex side fan - and one 120mm Coolermaster back fan.

So far nothing on the modular cables. If my rating is 36A is that per wire? Or system as a whole? I don't know too much about power supplies amps.

Thanks for the help.

Your PSU has 36 amps, PER RAIL, on each of 4 rails. Whereas some PSU's like the old PC Power and Cooling, would have a giant, single, 12v rail at 80A etc, yours is split into 4 rails. Each works independently, but contributes to the total wattage. Here is a great review of your PSU and at the bottom of the page is a breakdown of which connectors are on which rail:

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=151

Edit: For reference, you can handle two, and really three, of any card on the market right now if you felt like it. You could handle 3 580s if you wanted, or 4 less hungry cards even. 1kW is alot of power biggrin.gif
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by SaltwaterCooled;12003322 
Your PSU has 36 amps, PER RAIL, on each of 4 rails. Whereas some PSU's like the old PC Power and Cooling, would have a giant, single, 12v rail at 80A etc, yours is split into 4 rails. Each works independently, but contributes to the total wattage. Here is a great review of your PSU and at the bottom of the page is a breakdown of which connectors are on which rail:

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=151

Edit: For reference, you can handle two, and really three, of any card on the market right now if you felt like it. You could handle 3 580s if you wanted, or 4 less hungry cards even. 1kW is alot of power biggrin.gif

Thank you for explaining. I did read that review a while back I couldn't understand it all. You just broke that down to laymans terms.

So I could put the two cards on modular cables if I wanted instead of the fixed wire if I understood that. Cool.

This site is one of the most active and best sites for info on the net for a lot of different things. Again thanks Saltwater.
     
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post #10 of 11
Quote:
Originally Posted by Arizonian;12003927 
Thank you for explaining. I did read that review a while back I couldn't understand it all. You just broke that down to laymans terms.

So I could put the two cards on modular cables if I wanted instead of the fixed wire if I understood that. Cool.

This site is one of the most active and best sites for info on the net for a lot of different things. Again thanks Saltwater.

You're quite welcome, I was in your position not too long ago, it's nice to be able to give back. I would put one card on the fixed wire and the second on a modular cable (assuming they're dual plug cards). Otherwise two single cards on the fixed line should be fine too.
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