macpro burning through hard drives -- ? video card pulling too much power?

[Ken Cunningham]

This has nothing to do with Macports, but  there are many people here who know stuff about this...

About six months ago I put a new Metal-capable Sapphire HD 7950 video card in my 2010 MacPro (8 processors) to run Mojave. It required two extra power cables to give it all the extra juice it needs, in addition to the usual bus power. It seems to pull up to nearly 200W according to Tom's hardware <https://www.tomshardware.com/reviews/radeon-hd-7950-review-benchmark,3207-9.html>.

Since then, I have bricked three SATA hard drives on that MacPro, two older 2TB ones (2012 era) but one 2016 4TB SSHD that was pretty new.

All three of the drives just disappeared off the desktop unexpectedly with a message about not powering them off properly, and then at reboot would not spin up, and never did work again.

I'm suspicious that the 7950 is pulling too much power and causing the SATA hard drives to fail. I also have an AJA Kona 3G in that machine that pulls 20W.

Anyone seen this?

Ken