Review-Zone heeft wat lopen spelen met een AMD K6-III 400 en 450. Hier wat info over 3DNow vs SSE:
he K6-III has 8 64-bit (= 2 x 32-bit) wide single precision packed CPU registers, which allow to do two single precision FPU operations per pipeline simultaneously. The Pentium III, meanwhile, uses 8 new 128-bit (= 4 x 32-bit) wide single precision packed CPU registers to compute four single precision FPU operations per pipeline simultaneously.†
This is not exactly as lopsided as it may sound. The Pentium III is only able to issue one SSE computation for every two clock cycles, because Intel did not see fit to widen the entire data pipeline of the Pentium III to 128 bits to fill the registers. So, the fact that the Pentium III has 8 new 128-bit registers and 70 new SIMD instructions Vs the 21 SIMD instructions of the K6-III does not necessarily mean that the PIIIís SSE implementation provides twice the performance provided by the K6-IIIís 3DNow! implementation. Whatís more, the Pentium III is helped mostly by the memory streaming architecture. Unlike the K6-IIIís 3DNow! implementation, however, the Pentium IIIís SSE enables it to use MMX and FPU instructions in parallel.
Meer stuff vind je in de review van Review-Zone.