|"i cant find any documentation (sp) on the asus website"|
That's funny, I had no problem finding it:
"2 xDIMM, Max. 4 GB, DDR 800/667/533 Non-ECC,Un-buffered Memory"
Why would you run just a single stick & not take advantage of dual channel mode? And are you in the US? Where are you getting your RAM from? 4GB (2 x 2GB) DDR2-800 can be had for $20 after rebate w/free shipping at newegg.com:
Fry's has the same stuff for just $15...in-store only: