I am using Resolve Lite with Core i7 2600K processor, 16 GB ram, GTX 285 for GUI and GTX 580 3GB for image processing. Working with this configuration is nice and smooth with up to 15 nodes in realtime, with the internal scopes turned on. I have tried both Decklink 3D and Ultrastudio SDI, and both work great for monitoring output.
If I have understood correctly, the GUI card also takes care of the internal scopes, and I have found that it makes a difference which card you use there. Unfortunately I haven't had access to Quadro 600, but the GTX 285 handles it also very nicely.