Window 10's installer tells me my (NVIDEA (GeForce 7300) GPU is not compatible. I've found a list of that manufacturer's devices that are; but I haven't located AMD's yet. And is there any resource that the average joe (me) can get to that will allow me to find out which of these will work in a Dell Dimension E520 (which is 32 bit). Dell seems to have buried info about all their old machines.
Dell is not testing or developing Windows 10 drivers for this product. If you choose to upgrade, some features, applications, and connected devices may not work as expected.
Means you shouldn't use Windows 10 on that computer.