"There's a point of diminishing returns though. There is hardly any noticeable difference between 800, 900, 1000 speeds. You get a few ,more fps in a game that already gets 80-100 fps? Big deal. It's not going to help your web browsing either. Heh. Most people have no real need or use for 900 or 1000 mhz. There is no reason to dump a celeron system for a duron. If you need a new system duron is the better choice but the celeron does just fine. I had a BX motherboard on my second system. Put a celeron 633 in there and it's overclocking at 950 mhz. Way more performance than I."
This is true for most people regarding performance. I wouldn't need a cable modem or a GEforce2 GTS or 1 gig processor if it wasn't for gaming. Don't tell the wife that though. BTW, there is a clear difference between 100 fps and 160 fps to a hardcore gamer. Not that I am so hardcore by any means, just an observation from a lamer gamer. My celeron 533 oc'ed to 800 ran fine and I probably would not have purchased a new machine except for the fact that someone wanted to buy the celeron from me.
As for why would I need more than 100 fps? It's all about headroom. Sure your time demos will tell you that you just ran 100 fps but when you are really playing in a game you will notice much slow downs due to open areas or lots of crossfire etc... Having the 60 frame headroom will help tremendously when you actually need the frames.