WinRAR
The Asus P5K Deluxe WiFi did poorly at stock and only turned in average results when overclocked for WinRAR.
HDTach
We have noticed an unfortunate pattern lately with motherboards arriving at our labs - the burst rates seem to be capped at SATA 1 speeds. Most likely that a poorly written BIOS is to blame.
ATA speeds were mediocre at stock, and nothing to write home about when overclocked.
For USB speeds, the CPU utilization was very good, however the transfer rates were slightly lower than average.