X-Plane 9/10 and Lockheed Prepar3D are not "terribly unstable". I have run X-Plane 9 on a single core Celeron with 2GB of RAM, and it was stable (barely, getting 25FPS all the time). Anyways, I guess I'll go with the GTX 950, it's not a rebrand of an older card and has a slightly lower power consumption. Also, the second-gen Maxwell architecture is much newer than the GCN 1.0 architecture for the R7 370.