Graphics card for 2010 MacPro with HDX

[neev1073]

What are you all using for the graphics card that uses only one power connection?
I have the Mid 2010 Mac Pro running OSX 10.9.5
3.2 GHz Quad-Core
32GB of memory
HDX card
UAD Octo
ATI Radeon HD 5770 (1024MB)

As you see, I have plenty of power, but my current session keeps telling me that I don't have enough memory and won't open a few plug ins. I'm guessing it's the graphics card. If that's the problem, what are you all using? The one came with this Mac Pro needed 2 power cables, so I switched it out to the ATI 5770.

[neev1073]

Never mind. I found the problem.
Antares Autotune EVO.
I'm running about 5 of them on this session, and PT 10 didn't like it at all. I printed the tracks and no problems. Well, that was a half a day worth of trouble shooting.