The mb manual might not give detailed tutorials on Ocing, but both Asus and MSI and others offer utilities to OC within Windows, dynamically altering the clockspeeds...
The BIOS adjustments with most modern mainboards are not overly complicated, and one can usually squeeze out another 200-300 MHz with 6-8 keystrokes within the BIOS...
Head over to the OC sections in these forums, there are quite a few knowledgeable folks about....; can assist with explaining mem timings/ ratios, HTT adjust, vcore bumps, FSB impact, stability testing, etc...
Although even if stuck at 2.0G at stock X2-3800 speeds, most users will be quite satisfied..