I very much doubt it. As long as the cards are getting enough power, their performance shouldn't change.
One rail has an advantage over multi-rail that you can't run out of power on one rail while having power left on another rail. It has the disadvantage that a short on that one rail can get ALL the power, and do more damage
Have you changed anything else when you changed the power supply? Embarrassing question: did you remember to plug EVERYTHING back in? If you forgot, for example, to plug one of the graphics cards back in, you might get this result...
Yeah.. I had already the latest drivers before I put in PSU and had tested. I tried both older drivers and the ones I had with PSU to see also. I had quality settings the same too.. Both times set to let application decide.
Also, GPU temps are even better than before... never over 56 degrees (would get to 64 sometimes before although not worried about that)
I noticed that one of the power plugs could be put in a bit tigher. did that but hadnt tested again. I will try later on.
If that does not work, I will try reseating.. I had reseated before I pluged all in... hmm.. hope i didnt damage card while reseating (bit hard to see where plugging in since between it is case and network card. I was working on carpet, but was using grounding strap, touching case constantly, and those cards have so much junk around the actually card, you never touch it.
Btw, it was my first time putting in a psu. How does this look at far as tying down the cords?