So I finaly got my Z87-ws back after 5-6 week RMA. And I am getting ready to buy my first GPU of the 4 GPU setup.
The idea is ill have 3 GTX 780's and a single GTX 560 for dedicated Physx. Already own the 560)
Now I was just going to go for a stock 780 but decided to drop the extra on the EVGA Classified. Thats all and good but my PSU, Silverstone Strider Gold Evolution 1200Watt only supports 4 6 pin and 4 8 pin PCIe power jacks. Thats fine and all except the GTX 780's require 2 8 pins each. They each come with 2 2 6pin to single 8 pin converter so that would cover the third GPU but there is still a GTX 560 and a single 6 pin on the motherboard.
Now I was thinking simple 2 molex to single 6 pin but that only provides 2 of the 3 12v signals. Plus I only have 2 more full molex cables I could use. (Using one full cable defeats the purpose right? to many amps for the 12v cable to handle.)
So im not sure. However I do have a second PSU (Non modular) 700Watts 4 years old from coolermaster that I could build a mount for. It has 2 6+2 pins. That would free up 4 6 pin connectors for everything else im just not sure if using a second PSU in a system is a good idea. The Silverstone has a 100A rating on the 12v rail and the Coolermaster 52A on the 12v rail and I would short the PS-ON signal on the second PSU to allow it to power on.
I have a Phantom 820 so space is not an issue. however one this that is an issue is if I power a single 780 on the second psu, it will be powered on allways if I dont physicly turn off the PSU? Any ideas on how to turn off the PSU automaticly e.g. a switch powered by the first PSU on the PS-ON signal?
Just could really use home help with this. My electrical engineering is very limited to 3 months building switchboards and Highschool Physics.