Anyway, to make a long story short, I am able to bump clock speed. I manage to hit a very stable and healthy 1.2GHz above the stock clock speed. Now, this is a very respectable speed. Why? Because without any kind of voltage tweak, no option in the BIOS, running on a stock fan, I am only using a 320w super old Delta Electronics power supply on a cheap chassis. The benchmark results are nothing to sneeze at as well as it offered tremendous increase in performance. The motherboard also allows a cheaper processor such as this Intel® Pentium® 4 506 to perform beyond its current capabilities. If you have any doubts about the screenshot, here's the validation link. With a 2.66GHz processor to a 3.8GHz processor on a supposedly non-overclockable board, I can't complain!
Source:Article: Intel® Desktop Board D101GGC Review (Embracing 3rd Party Chipset?) - Part III