would the 4x slots be enough to keep stable rates on 750ti's?
I did try a 1x-16x riser inside a 4x slot. That yielded 5-6% decreased performance in hashrates, but as far as stability, it is rock solid on +135 core +600 mem overclocking.
Just curious if this same issue can affect the card in the 16x slot? I have two 750ti's. My mobo is PCI gen2 so I have the a Gigabyte 750ti in the 16x slot and a Gainward 750ti in the 1x slot via a PCI riser. I can get 300khs easy on the card in the riser but the card in the 16x slot won't ramp beyond 215kh/s no matter what I try. If I disconnect the riser, the internal card scales to 300khs easy.
So I know most people experience a hashrate hit to cards running via external risers but I'm experiencing the opposite where the riser card will ramp up nicely but the card in the 16x slot won't go beyond 215khs when the riser card is connected.