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Amperage questions

Y

YoMoma

Limp Gawd
Joined
Jun 21, 2005
Messages
201
I am still undecided on a power supply, but after a little more reasearch I didnt realize how important the 12 volt supply to the vid cards are. Quoting something I have seen in the recommended power supply thread.

"GeForce 7800 GTX (G70) Specs Updated:
Single card requires min. 400W PSU with 12V rating of 26A
SLI configuration requires min. 500W PSU with 12V rating of 34A"

If you will look in my sig you will see my soon to be rig`s specs.

If the 12volt rating needs to be at the 34amp level for a dual card setup, That severely restricts the choices for a psu. As a matter of fact, the PC Power & Cooling: Turbo Cool 510 SLI psu is the only brand that comes near the 34 amp level for a vid card. I know this brand of psu is about the best quality made today, but I sure wish there were a few more choices. Not being a modular psu I would think there would be a few if not more cables not being used that will clutter up the inside of my case.
By the way, any other amperages to any other equipement that I need to consider?
 
YoMoma said:
If the 12volt rating needs to be at the 34amp level for a dual card setup, That severely restricts the choices for a psu.
Click to expand...

No it doesn't.

Especially if you consider that 34A is equivalent to 408W and there are a number of power supplies with two or three or four 12V rails that have a maximum combined wattage of 408W or better. Nobody said you had to get a power supply with one 34A 12V rail.
 
You should be fine with that enermax. It has dual +12v rails. I'm not sure about this, but someone said if you add up the two rails and just take 80% of that, it would be similar to a single rail PSU with that amount of amps, which would be 35A for your PSU, but again I'm not sure if that's correct.

But I'm sure your power supply can handle the two 7800GT's. A lot of times the specifications are exaggerated.
 
YoMoma said:
Well, what are they meaning here then on this thread about sli?. 3rd quote down.

sli amperage
Click to expand...

It means you should have a minimum of 34A on the 12V rails.

I'm not contradicting that. But you can have a power suppply with more than one 12V rail. That quote says nothing about suggesting that you need one 12V rail that is 34A.

You haven't seen power supplies with a pair of 18A 12V rails? A pair of 20A 12Vrails?
 
jonnyGURU said:
You haven't seen power supplies with a pair of 18A 12V rails? A pair of 20A 12Vrails?
Click to expand...

Yes I have Johnny. So they are saying the two rails in sli should be around 34 amps in total.
 
Correct. The combined 12V rails (by what the label says the combined output is, not by adding +12V1, +12V2, etc.) should be equal to or greater than 34A. This number is typically in watts, so that would be 12 X 34 = 408W.
 
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