I've ordered some SATA to PCIE cables, I'll see what happens.
Pixlas mod me be best answer for long term
Need to get more feedback from others with Pascal Titan cards
The problem isn't the mod itself, but the level of skill needed to perform the mod. Even using the clamps the mod goes well beyond the vast majority of users' capabilities, and given peoples' tendancy to fudge even step by step instructions combined with Apple having used ALL BLACK
wiring, I'd be hesitant, to say the least, to advise the average Joe to mod a PSU, especially when they aren't being made anymore. Whatever stock Apple has left in GSX is it - once they're gone, they're gone.
It would be nice if new units of 5.25" bay external PSUs were easy to find for the Mac Pro crowd. I'd be kind of unnerved by upwards of 150 watts travelling through SATA wiring, but especially those tiny pins.
Those Mac Pro PSUs would be a lot more replaceable if Apple hadn't embedded the SATA data+power backplane into the PSU's lines. Unless of course each of those backplanes' power segment is connected via a PCIe type connector like on a modular PC PSU, in which case you'd have instant access to virtually any PSU on the market so long as it's modular.