Originally Posted by
informal
Nope. I have 3.2x mp ratio on my 750K in C15. That is exactly 20% lower than what "true" QC with no SMT get in this metric(like 3570K etc.). Kaveri will have dedicated decoders so 20% penalty there will be gone. This will make it basically scale as a true QC chip since the mp ratio will be ~3.8x+ or in the range of "true" QC designs. Then on top of that you will have *some* IPC gain over richland, it can be 1% or it can be ~15%, depending on the test. No wonder why AMD lists ~30% more ops/cycle, this is exactly what you will get when you multiply both the effect of dedicated decoders and the IPC gain due to various other improvements: 1.3x~=1.2x1.1 (20% being due to no penalty as we have 8 intsr/cycle per module instead of just 4 in multithreaded workloads; up to ~10% IPC which might be on the lowish side here but I'm being careful here).
Kaveri will look to outside software like a genuine QC product (looking at MP scaling factors, execution threads etc.). The possible fact that it won't be as fast as say 3570K( both at stock of course) doesn't mean it won't be a "true" QC. It will mean it is just a slower true QC product. The reasons behind this are various but let's say intel will still have more integer and SIMD/fp capability "per thread" in this comparison so it's no wonder this might still be the case. Excavator core will expand on SR core so in 2015 we might finally have a core that will be roughly on an equal footing with Haswell/Broadwell (core per core, frequency being design specific). Intell will still have an advantage in thread count as AMD won't be going over 3 modules/6 threads, but most software on desktop cannot still even utilize 4 cores properly so it won't matter.
