I would have to say you will see some improvement, but very little. Your cpu is REALLY hold you back and your memory isn't far behind. Its being PC2100 isn't too bad, but only having 256mb of it is whats geting you more. The main thing is still your Duron @ 1.3GHz. I am still interested on how much it will help you, but I am sceptical and I believe that if you plan on playing any sort of 3D games its time for an upgrade way over due.