You're basically going to have to build a new computer if you want to run at 2 GHz. The 733 is Pentium III socket 370 which I believe only went up to 1.33 GHz. You would need a socket 478 motherboard for a 2 GHz CPU. You should be able to use the hard drive but thats about it. The memory is probably PC133 168 pin; if you really wanted to save your memory you could get something like the Asus P4SGX-MX which supports both 168 pin and 184 pin RAM. I have a Dimension 4100 PIII 800 MHz it isn't worth upgrading. I just have it hooked up to my TV/stereo in my room so I can watch movies and play music thats on my network