it can be done you need something like this. the viewsonic ones are the best
http://viewsonic.com/support/accessories/tvvideoprocessors/nextvisionn4/index.htm
ISPgeek just be careful dont do too much at one time, becuase when you over clock the cpu you overclock everthing in your system from the cpu to the video card to the ide controller. only do like a 2mhz fsb jump each time and the test.
if you can try and do a ftp upload because i have that same problem with speed test sometimes, the upload would always be around 444kbps. but when i did a ftp upload is was about 480kbps