Sa desktop AMD processor aren't really that complicated to understand.
Richland ( socket FM2 ) are APUs. Good for entry level gaming without the need of a discrete gpu. Ang "K" at the end of each model name denotes an unlocked multiplier. The APUs are divided into sub-categories.
A10 - quad-core
A8 - quad-core with lesser graphics
A6 - dual-core
A4 - dual core with lesser graphics
so basically, A10>A8>A6>A4.
There are Athlon X4 APUs ( Trinity APUs with the graphics part disabled ) and you can apply the same naming rule sa Trinity.
Sa naming convention, makita nimo asa mas slower based sa sa second digit sa model e.g A10-6800>A10-6700.
Sa Vishera, sayon ghapon. All processors are unlocked. The number of cores can be determined sa first digit sa name e.g FX-4300 is quad core, FX-6300 is six core. So you can say vishera is divided into three sub categories. The quads, the hexa and the octa cores. Each sub category is ranked based sa third digit sa name e.g FX-6300 is a 3.5ghz hexa core, FX-6350 is a 4ghz hexa core so the latter is faster. Makita nimo ang generation sa 2nd digit sa name e.g FX-8120 is bulldozer while FX-8320 is piledriver.
So in general the higher the name the better.