Okay, I upgraded all these components at the weekend and it works like a dream. Set all the graphic options, in all my games, to max and they all run smooth (I love that part of upgrading). Not tried a flight sim yet, but Planetside2 never moved from <60FPS in huge battles and looks divine!
But... I have a question for all you SLI/multi-card experts. I wanted to keep using my old GTX275 as a PhsyX engine. But when I installed Win 7 x64, with both cards fitted, it didn't recognize the GTX970 and installation of the nVidia drivers failed everytime. Pulling out the older GTX275 and rebooting worked, and nVidia drivers installed perfectly. Re-fitting the GTX275 and booting up caused a B.O.S. So in the end I gave up and left it out.
Now, I'm thinking maybe it was because I left an SLI/CFX motherboard jumper set on default? It has 3 settings: disabled, 2-Way, or 3-Way. I'm wondering if I need to switch this to 2-way first, even though I'm not using SLI, I'm just using 2x independent graphic cards. With the GTX970 connected to the monitors and the GTX275 left alone to PhysX only.
Anyone have experience in this?