Quote Originally Posted by informal View Post
Jack,it's rather simple. If yo urun single thread on a module that is SIMD heavy,all FPU resources(2xFMAC) will be dedicated to one core. Then ,if you ran same test but MT ,across all 4 modules,all 8 cores will then share 4 FLexFPs (in total 4 256bit units). You will have scaling from ST to MT akin to sclaing from single core to QC,only this time your single trhead results SHOULD be very high as you are using one double-sized very powerful FPU(whole FLexFP within a module). Scaling is better than pure 4x since now SMT works within FlexFP as 2 cores per module share 2 128bit FMACs and this improves performance additionally.
The problem is,however,that one FLexFP is somehow slower than one Thuban core

@xsecret
Well vrzone just ran the same chip on 2 different motherboards xsecret.Guess what,on different boards,same chip performed with 80% delta... So it's the firmware problem it seems.
Ignore all those "tests" it's just pure bull. Compared to Thuban the singelthread performance is higher and also the multithread. Of course it's not slower.

The FPU is doubled up from the K10 generation. Intel also doubled the FPU with Sandy Bridge, but with the same core count. Also, I should call Bulldozer for a 4 core design with 8 thread execution capability, so the 4 256-bit FPU's matches the cpu well.

AVX will only use 256-bit mode, so in all other situations, the flex-fp should shine, and of course with a lot of optimization.

Bulldozer will rock and wait for final release. Those test's is all fake or with a earlier ES cpu and is not representative.