Actually AMD is talking about a per-core stance. Zen 2SMT core is 2x an 8100's 2CMT core's performance at same clock.
And zen has 2x the cores as well.
Not surprising how many of the trolls missed this bit.
Remember, Zen was designed by THE best CPU designer of the modern era and the reason Bulldozer sucked is they removed the SMT scheduler from the prototypes in a risky move that didn't pay off. I don't wanna get too technical but the basic is that Zen has CMT-under-SMT, it has twice the math power per core as an 8350 at a matching clock and the SMT scheduler on top of that to make it all work slick. On top of that the density of 14nm allows it to have twice the processors to begin with... so basically a Zen 8 core will be about 3.5x more powerful than a Vishera pulled to the same clock speed and the SMT function will reduce a great deal of the latency that Poopdoozie chips suffered... and they've strapped DDR4 support onto it too.
Vishera = 2,3,4 core chips with twin CMT sub-cores
Zen = 4,8 core SMT chips with quad CMT sub-cores
CMT is Concurrent Multi-Thread... meaning that the cpu using both math cores can ONLY do the maths and has to be fed the maths by the OS. When you're only doing the kind of maths these are designed for it works pretty good. my 2.3GHz twin G34 Opteron (two 8/16 7360s) eats Folding@Home like candy but can't do jack else without slowing way down. It stomps out the CPU work twice as fast as my 3.5GHz i7-4930 running 12 threads. That's 73.6 vs 42 when you do simple clock*core yet the Opteron board easily produces a little over twice as fast because the folding@home work is CPU aware and leverages those little CMTs.
SMT is Simultaneous Multi-Thread. This is what intel used to offer on i5's until they discovered people were AOK paying twice as much for a processor.
What SMT excels at over CMT is dealing with interruptions. Things like the OS, Antivirus, Skype, streaming and everything else. So when you have a SMT processor you can get away with having tons of useless tasks loitering around in memory since they won't really slow down your main 3 or 4 threads. This is why the i5's work so well. You tune em up and get your ducks all passive and they make great little gaming boxes... unless you're used to i7 SMT. Leveraging the SMT as a functional utility on the operating system makes a huge difference too. It isn't necessary in gaming. Hell, if Zen came out without SMT it'd still be a monster of a chip. With SMT 4 core Zen APU's that have 16 CMT math processing and a fairly robust 14nm R400 APU core set on the side they'll really rock.
Basically AMD may have caught up with intel in the last 12 months. intel has been almost completely idle for more than two years just bringing lab tech to consumer use.
... and you Know that AMD is gonna price Zen sweetly.
Edited by prjindigo - 9/4/16 at 3:54am