Do you mean microarchitecture (uarch)? Because Vishera isn't a uarch, it's the name for a series of CPUs (based on the Piledriver uarch).
Skylake is the best uarch right now. AMD's most recent uarch is still a fair bit behind of Intel's in terms of performance per clock (and performance per watt I think). However, AMD's CPUs tend to have more cores and higher clocks than Intel's at a given price point to help compensate.
Well, after a while- about the late 90's to 2000- x86 won out. Then in the early 2000s, AMD launched AMD64 and that has been the dominant performance architecture for a decade. ARM is gaining a lot of adoption because it has a much better power/performance ratio making it good for mobile devices. So that's basically the state of microarchitectures today, although we still see a lot of MIPS for embedded applications, although ARM is replacing it in most spots, and occasionally a SPARC or Alpha server chip. Even Itanium occasionally shows up. But AMD64 and ARM are the only really important ones.
Oh, that's what you want. Well, at the moment Skylake leads in performance and Haswell is barely behind it, and Piledriver wins on threaded tasks as a value chip.
Do you mean microarchitecture (uarch)? Because Vishera isn't a uarch, it's the name for a series of CPUs (based on the Piledriver uarch).
Skylake is the best uarch right now. AMD's most recent uarch is still a fair bit behind of Intel's in terms of performance per clock (and performance per watt I think). However, AMD's CPUs tend to have more cores and higher clocks than Intel's at a given price point to help compensate.