@pos_yo hello, sorry I just answered now, well, there are thousands of am3+ motherboards that support fx, in fact that socket was designed for fx. but.... the chipset that comes with the one you mentioned is.... terrible and the data bus, HT doesn't even reach 800mhz, and fx, if I remember correctly, was at 2ghz. that's why it doesn't work. you have a bottleneck of scandalous size. look for a 990x or 990fx which are the ones with the highest data bus since the 970 980 and others are given a small oc to go up to 2ghz.
and always look for amd chipsets for those processors. they are the best that go with them.
but fx are not 6 core. they are 3 core and 6 thread.... the fx issue was a scandal. for me, the best of that era are the 1100t or that series of phenomn II x6 those are real 6 core. and with some improvements and tweaks, they can compete with more than one i7 of that era.