Originally Posted by EniGma1987
We are talking architecture improvements for generations, not complete arch redesigns that focus on different things. The single anomaly is Bulldozer to Piledriver, and that happened because when BD released it had major node issues as well as a major arch flaw that required a patch to the cache system to workaround. Both the cache flaw was fixed and the node was fixed for the Piledriver release, so we saw a nice speed improvement.
As a side note, AMD did not gain 22% from Thuban to Bulldozer. Thuban was clocking a very consistent average OC of 4.2GHz and Bulldozer was doing 4.5-4.6GHz. Thats a 9% improvement. Since we are talking speed jumps from overclocking here, and the comparisons between BD and PD are overclocks, it is only fair to talk about Thuban's average OC when comparing it to BD as well.
It is possible we could see such a thing again given we have yet another cache issue holding back the speed of Zen arch. Though it isnt an actual "flaw" in the same way as BD had a real flaw and required a full extra copy operation to mirror data so the CPU didnt crash. Zen's cache issue is simply the design doesnt lend itself well to getting extra clocks beyond how it was designed. The cache has been tweaked, but even if AMD can tweak the design enough to allow greater clock headroom in the L2 cache it still wont be massive jumps in headroom.
Yea no, Thubans average was not 4.2, that was a good chip on a good day. If you want to go that route, then in the same category Bulldozer was 4.7-4.8 and PD was 4.9-5.0.
1100T: 3.3-3.7 stock
8150: 3.6-4.2 stock
8350: 4.0-4.2 stock
9590: 4.7-5.0 "stock"
So legitimately no idea where he got 22% from.
That said, BD's design took a MASSIVE change to queue depth and core design (ignoring any and all performance values) to achieve it's clock speed and they are not even remotely comparable to the Stars archs. If you want an example of clocks over time, Phenom II got better over time substantially, going from the 940 at 3Ghz to the 980 at 3.7Ghz scaling perfectly the whole way, though they got steppings, did not have any form of turbo, and certainly no form of boost/XFR to max out the chip from day one.