Athlon II and Phenom II share AMDs K10 archetecture/ each core is a separate processing unit. Athlons have L1 and L2 Cache, Phenoms L1, L2, and L3. Die is 45 nm.
Bulldozer is the replacement archetecture using a hybrid one module/two cores design. FX-XXXX designation socket AM3+
A module "shares" L1, L2, L3 resources. Die is 32nm. Each module would be designated 2core/2thread.
Bulldozer was late (intel went thru two generations of Die shrink waiting for Bulldozer)
and over hyped. Early performance was disappointing as as it more or less "equaled" Phenom II X4 processors and produce high heat/power usage by Intel standards. Introduced at higher than performance justified pricing.
Piledriver was the first revision to the Bulldozer. Faster, cooler (a little) minor changes/ improvements. Better pricing.
VISHERA is the latest upate on Bulldozer. much better price/performance, still disappointing single thread performance. Better faster less heat.
Fusion is AMDs for putting CPU/GPU on one Die, calling it an APU
Llano was the first generation using traditional one core/one thread K10 archetecture design. Eliminated L3 Cache, basically Athlon II CPU and 5000 series graphics using/shared motherbopard memory. This is why high memory speed is important.
Trinity replaced the K10 cores with Piledriver modules, with minor gains overall.
Trinity A4 and A6 are single module two core APUs. A8 and A10 use 2 module/4 core design. No L3 Cache. 6000 series GPU.
Unless there is a great price advantage buying an FM2 APU Without intending to use the iGPU function is puzzling.
I believe, please confirm, that although HD66XX/65XX Cards are renamed HD 56XX/55XX Cards the HD5670 does not crossfire with Llano APUs
Llano functions in Hybrid Crossfire with HD 6570/6670 graphic cards.
Trinity crossfires with HD 66XX/65XX also.
Hope this is helpful