• Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
    Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.

Balancing GPU loads

A

Arcygenical

Fully [H]
Joined
Jun 10, 2005
Messages
25,066
Alright, so, a few days ago I purchased a 750w Thermaltake Toughpower from someone here on the forum. The damn thing has 4 12v rails capable of pushing 19a each.

This PSU will be running 4 8800GS GPU's (not in SLI) on a very low powered AM2 Athlon CPU (around 65w)... nVidia's estimate for the 8800GS's power requirements is 105w at full load (It will be less for me as I'll be underclocking the core and RAM quite a bit)...

Therefore, I'm wondering how to distribute the main loads.

I'll be putting the first card on the 12v0 (the first stock PCIe 6pin)
I'll be putting the second card on the 12v1 line (the second stock PCIe 6pin)
I'll be putting the third card on the 12v2 line (the ones that power the molex and SATA lines)

Where should I put the fourth card? I'll probably used the 12v2 line, as the 12v3 line is in use by the P4 connector...

So, with a total peak loading of 210w off the same rail, a power draw of about 18a (of the total 19a) and assuming no power is coming from the board (really, I have no idea how the board would allocate power to 4 cards in crossfire X, which I'm assuming would be the same as 4 seperate, non SLI'd cards).

Input would be welcome :D
 
It seems like you'd be fine with the configuration you suggested. It's a good PSU, so there should be no issues loading the 12v2 rail almost to capacity.
 
Bitchen.

Wanted some confirmation before I completely void the warranty ;).

Time to go cut out some unneeded connectors.
 
You must log in or register to reply here.
Back
Top