Hi All, So a couple of years ago I bought a used PowerMac G4 (Sawtooth). It has a 450mhz processor, with 512MB RAM. I upgraded to a new iMac (so freaking hot!), and gave my eight year old the PowerMac. He's starting to use it more and more, and it seems to me that it'll be cheaper to upgrade the processor on that rather than buy him a newer computer. But here's the question: will it make a big difference if I put a single or dual processor in, if the processors are roughly the same speed? Here's what I'm looking at: http://store1.sonnettech.com/product_info.php?cPath=22_26&products_id=150 http://store1.sonnettech.com/product_info.php?cPath=22_26&products_id=161 Please do keep in mind that an eight year old will be using this, and probably won't even be surfing the net for another year or so. I would, however, like to keep this computer around for awhile, and don't want to have to upgrade it again any time soon. Thanks so much for any advice you might be able to offer!