AOpen i915GMm-HFS

Test Setup:

Intel Pentium 4 Extreme Edition 3.4GHz (512KB L2, 2MB L3); 2 x 512MB Corsair 5400UL DDR2 (operating at 533MHz in dual channel with 4.0-4-4-12 timings); NVIDIA GeForce 6800 GT (operating at 350/1000MHz); Western Digital Raptor 74GB; Windows XP Professional Service Pack 2; DirectX 9.0c; NVIDIA ForceWare 71.89 WHQL.

Intel Pentium M 2.13GHz (2MB L2); 2 x 512MB OCZ 4300 DDR2 (operating at 533MHz in dual channel with 4.0-4-4-12 timings); NVIDIA GeForce 6800 GT (operating at 350/1000MHz); Western Digital Raptor 74GB; Windows XP Professional Service Pack 2; DirectX 9.0c; NVIDIA ForceWare 71.89 WHQL.

Intel Pentium M 2.13GHz (2MB L2); 2 x 512MB Corsair XMS Pro PC3200 (operating at 333MHz in single channel with 2-2-2-5-1T timings); NVIDIA GeForce 6800 GT (operating at 350/1000MHz); Western Digital Raptor 74GB; Windows XP Professional Service Pack 2; DirectX 9.0c; NVIDIA ForceWare 71.89 WHQL.

General Performance:

Summary:

The very limited memory bandwidth the Pentium M can access negates whether it has single channel DDR or dual channel DDR2. In theoretical tests this effect is more clearly shown than real world testing like mp3 encoding. As for pure FPU calculations, the Pentium M's shorter pipeline gives it the edge even over a Pentium 4 CPU clocked over 1GHz faster. Memory efficiency is also poor on the Pentium M - we were seeing about 51% efficiency in our DDR2 Sandra tests and 77% with single channel DDR.