They're not exactly stock parts, as there's no 8core APU from AMD at the moment, but I take it that it's basically two dies on the APU? Even if that's not the case, since the APUs are based on the AMD FX chips, an 8core certainly is feasible.
Of course the greatest problem is the GPU side of the APU. As I see it now, they are using straight derivatives of the GCN architecture.
Anyway information on the hardware is still kinda scarce, but seeing as both machines are using APUs from AMD, I'm pretty sure they will be the closest to a PC they'll ever get. I may be completely wrong, but until release we can't know for sure.