A motherboard is not defined by what memory it supports, it is defined by what CPU it supports.
Thus you are looking for an AMD socket AM3+ board, specifically a 970 or 990 chipset to properly support an FX-8350
With that said you dont want this platform.
First and foremost that "8-core" cpu is not an 8 core but a 4 core with bassically hyper threading like intel's i7.
Now in 2012 when this processor came out it was a good bang for buck; but while AMD was stagnent up unitl a month ago, intel had kept chugging along and now a $60 Pentium G4560 cpu can actually beat it in most games with half the cores/threads becasue the AMD is that inefficient compared to modern intel chips.
Whether you are looking at multitasking or looking at gaming...