HD Tach
We used HD Tach 3.01's 8MB zone test to measure basic SATA throughput and latency.

Burst and sustained read speed results are pretty tight, but HD Tach's sustained write speed test teases a little separation from the pack. The P45 finds itself in the middle of the bunch there.

Random access times are all but identical, and CPU utilization doesn't vary much from one chipset to the next. Keep in mind that HD Tach's margin for error in the CPU utilization test is +/- 2%, too.