I must give juice to 4x 1080ti. I only have 2 of those 8 pin to 8 + 8 (6+2) per PSU. I have another rig 6x 1070 on a corsair PSU.

The rig I want to place the 4 1080ti is a EVGA PSU... Somehow the companies hate each other and even though the cables are same family, they won't fit.

Now my question is, if I cut or use sandpaper to modifiy the shoes that won't go into the PSU, would that be a big nono ?

I tried to find cable to buy separately, they seem to sell them only in complete set, which is almost $100.