You cant connect 6 GPU's on 1 PSU. There is no PSU on the market with 12 PCIe connectors.
EVGA has 9 connectors. You can run 4 GPU's and if you use a cable-mod (CPU to PCIe) you can run 5 GPU's.
(SuperFlower is the same as EVGA. If you dont need the 2000W, better go with EVGA!)
Seasonic Prime Gold 1300W ATX 2.4 (SSR-1300GD) has 10 connectors. With good undervolt you can run 5 Radeons. But with every energy-spike, every GPU-reset, everything which dont stay optimized will shut down that PSU.
(Corsair and CoolerMaster also have PSU's with 10 connectors. But in terms of quality and warranty they both stays way behind EVGA. Even Seasonic is not the best pick.)
So better split your load to 2 PSU's with a bit of room. If you need for example 900W for 3 GPU's, buy a 1200W or 1300W PSU. The 1300W Gold EVGA PSU's are mostly cheaper than the 1200W xxx PSU's, so the 1300W is the better choice. No need for Platinum and co, if they are only for mining.
Life saver tip: NEVER EVER use cheap 6-pin to 8-pin PCIe adapters to connect just 1 double cable from your PSU to your GPU!!! They will get very hot and if you are unlucky, you can burn down your home!
Another tip: Don't use cheap chinese server/mining PSU's. Protect your investment with quality!
Hey, yeah I had feeling connecting 6 gpus would be an issue.
My plan was to have 1 psu that can powerup as many gpus possible, so 6 cannot be done, how about 5?
Yes you are correct, the adapters will work fine for short term, but it will definitely get hot, so I won't go down that route.
I just wanted to confirm with everyone, my best option is to connect 5 gpus on 1600watts psu?
Just that with EVGA 1600G2, I was able to connect 4 gpus without an issue, it appears adding 5th gpu will be an issue as there isn't enough connectors. Although, there are now 2 x 6-pin sata ports available as I got the fans changed.
Do you think I can use 2x 6-pin sata ports to fire up the 5th gpu?
Thanks