This post is about 1 PSU configurations. This is easiest way (not cheapest) to start folding with 4 cards, You don’t need to fing rare 2 PSU case.
If You have challange to fold on 4 modern graphics cards, like NVIDIA GTX 295, You might find lack of suitable power supplies. First, there is not enough 6-pin and 6+2-pin PCI-E connectors. Secondly, they don’t deliver enough current — one GTX 295 draws 24-25 Amperes. Each card has 1 6-pin and one 8-pin (6+2-pin) connectors. I have been researching PSU-s for 4 card scenarios and here are my suggestions:
Manufacturers and models suitable for 4 tough cards:
Thermaltake ToughPower 1500W: 4 x 6-pin + 4 x 8-pin P, 12V rails total 120 Amp’s
Cooler Master Real Power Pro 1250W: 6 x 6-pin + 3 x 8-pin, You have to combine two 6-pin to one 8-pin, 12V rail total power 128 Amp’s;
Enermax Revolution 1250 EGT: 8 x 6+2-pin PCI-E, 6 rails a’ 30 Amp.
Known PSU makers, not having enough:
Corsair — only 1000W model with 6 x 8-pin PCI-E configuration
Antec – only 1000W model with 2 card support
ePower – has 2000W PSU, but limited only to 2-3 card, having only 2 x 8-pin PCI-E
Ultra has X3 1600W PSU, but only 2 x 8-pin PCI-E
more after the break…