[Ryan Placko]

Hi Jose,

Well as an addition to this post, part of my problem as it turned out was that my GTX 285 was failing. It died a few weeks after I made this post. It’s true that flushing the render files helped my problem, but ultimately it was the dying card that gave me trouble.

But currently I am running a ATI Radeon HD 5870 with two monitors for my GUI, and I have a Quadro FX 4800, like you, in the 2nd slot, with no monitors hooked up to it. I’ve had really good performance out of FCPX, but from what I’ve read, that’s because of the Radeon card, not the nVidia card.

My current configuration has been good because it gives me good performance in FCPX, and also good performance in CUDA-enabled software like Resolve, After Effects, Premiere, etc

Hope that helps.

[Ryan Placko]

The follow up to this is I was blaming the GTX based on a lot of posts I read.

The issues I was having did not have to do with the 2 video cards, it had to do with corrupted Render files in the FCPX project. Once I deleted all of the render files, performance greatly improved with both JUST the 5870, and also BOTH the 5870 and GTX 285 together.