Would a AMD 760K Richland Quad-Core 3.8GHz Socket FM2 100W Desktop Processor AD760KWOHLBOX fit a GIGABYTE GA-H61N-USB3 LGA 1155 Intel H61 HDMI USB 3.0 Mini ITX Intel Motherboard?
Let us know what you need it for and the rest of your proposed system and then the folks here will be able to give you a more educated direction. I'll bow out as I'm still building one myself. Others have much more experience in these matters than I. Good luck with it mate.
Well, not anymore you can't, anyway. Quite a few years ago you could drop the likes of a amd k6-2 into a pentium mobo. Then with the introduction of athlon amd started designing their own mobo chipsets and has never looked back since(That was about 15 years ago).