My box goes through a few different configs, depending on the type and size of project I’m working on. I use it with Avid DS mostly, as well as Media composer and resolve.
I have had two graphics card in it, K4000 and gtx 780?..not sure about the exact model. That gave me real time red at half res good.
Just remember it isn’t all about the graphics card. Ram, and storage play a role as well. Fast storage is a must in my experience. As well, for most red work, I don’t need to be at full premium unless I’m looking at a particularly noisy shot. Other wise I keep the resolution lower until its time to render.
For the most part though, I love the z820. Totally customizable, which for me is a must. Add in thunderbolt from all the shooters who forget that not everyone is on a mac, and its great.
Glenn