Aren't the eight-cores (8350 I think) just AMD's shot at a hyperthreaded quad core? That's what I've read.
No, that's Intel FUD, repeated ad nauseaum by Intel fanboys. The FX architecture has nothing to do with hyperthreading or AMD attempting to duplicate it. It's AMD's second borrowing from the old Alpha 21264 architecture of the late 1990s. The Athlon and Athlon XP used its bus protocol, and now AMD has revived part of its ISA. The 21264 series also had two execution units and one FP unit per module.
For most tasks, an 8350 is an eight-core CPU in every meaningful way, because x87 FPU performance isn't nearly as important as it was before all of the various SSE instructions were invented.
What AMD ended up designing isn't praise-worthy, because it's so darn inefficient, even in Piledriver, and I say that as an owner of an FX-8350. But it's not that AMD tried to duplicate Intel design principles, they just poorly executed a design of their own, based on a highly-successful concept that DEC had used.