ScienceMark 2.0 and Pifast
The twin evils of lower memory bandwidth and higher latencies push the PF5 Extreme's bandwidth measurement, according to ScienceMark 2.0, to around 10% lower than other LGA775-based chipsets'.
It's not surprising that latency is higher than a reference i945G that's run with 3-2-2-8 timings. Expect ensuing benchmark performance to be that little bit worse.
The difference in bandwidth and latency translates to around a 5% performance deficit when compared to the reference i945G running with DDR2-533 memory. Remember, although DDR2-533 is inputted in the ECS PF5's BIOS, actual memory speed is only DDR500.