With SB 4 core, and don't see why Zambesi can't be on his level or even surpass it. SB 8 core will be faster, and more expensive, same as 980X vs X6.
SB 4 core is slower than current i7 six-core, there are no core increase just a bit more ipc and other tweaks. From Thuban --> Zambesi we have core increase, ipc, more cache, new memory controller, updated optimizations (SSE4.1-4.2 which benefit i7 in some programs over the X6 such as the adobe suite, and also AVX -available for both intel&amd-).
Maybe that's a reason why people are not too impressed with sb launch (they wanted 6-8 core version from the get go).
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