After much tweaking, I was able to get this card up to (215/475) with no corrupted texture etc.
No special cooling techniques was applied to the card, other than I have 2 80mm fans blowing on the AGP/PCI slots. There is a slight chance for me to up the mem clock even higher (+2-3) but the core clock would not budge over 215 or textures become corrupted.
Quite incredible given that I am running on a 147Mhz bus.
However, I was not able to get AGP 4x to work. It simply corrupts windows display (safe mode and all) whenever I boot up, that's even using the regular 200/400 settings. Miscellenous settings like AGP fast write and SBA are both turned on without any complaints from games / windows.
The memory they use on this card is truly awesome.. don't miss out a good deal

Cheers!