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The thing with SMT4 is that ZEN only has 4 integer units per core... The implication being they would need to at least double the number of execution units per core and that wouldn't make much sense. (Because most x86 instructions decode into one or two micro ops) In that case a scaled up modern CMT architecture would be better. (Scalar Pipelining and Out of Order paralellism was invented because of that fact. Having eight integer units wouldn't much better for a single thread than just 4 integer units. And an 8-wide decoder would be huge and probably slower due to sharing so much hardware. Why I think a CMT architecture woudl be a better choice at this scale)
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