Quote Originally Posted by terrace215 View Post
That figure appears to come from an AMD chart focusing on one projection, "Floating Point performance".

It shows MC at "28", and Interlagos at "43" (at max, the line fades starting around 40). 43% to 53% improvement.

But given that Interlagos/BD has AVX (including FMA), this really isn't all that impressive, is it?

"Integer performance" on the same chart goes from "29" to "36-38.5" (from start fade to end fade)

That's a 24% to 33% improvement for 33% more cores.

Hmmm, doesn't really look like much single-threaded improvement there.

In sum:

From -7% to 0% performance loss per core on "Integer"
From 7.5% to 15% performance gain per core on "Floating point" -- and that's with AVX!

Can you imagine the outcry from saaya were SB to compare to Westmere in such a way? I can hear it now... "Epic Fail!!!!!111"

Other than AVX helping FP perf, somewhat less than expected, I don't see any single-threaded gains from MC --> BD, not based on these performance projections, anyhow.
http://www.anandtech.com/show/2879/3

A 16 core (8 modules) Bulldozer based CPU is 60 to 80% faster than a 12 core Magny Cours in integer performance when using SPECInt_rate as a benchmark according to Anandtech.