Pci Graphic Cards

OK, I'm new and have 2 questions. I have an eMachines T1150 1.3ghz 256mb ram,onboard 32mb Intel extreme graphics w/3D accelerator,LM810E motherboard, socket 370.
1) can I switch the celeron for a pentium 3, and will there be any problems with it?
2) Are PCI graphics cards better than the onboard graphics I have, The recommended card on eMachines site is the nVidia Mx400 64mb DDR PCI Graphic Card for 70 bucks, But I found an ATI Radeon 256mb PCI card for $100 at a local dealer. Any suggestions?

 

socket 370 only went up to 1.4ghz. that 100 mhz is not going to even be noticable.
any pci video card will be better then the intel xtreame crap thats onboard.

i would upgrade the video card. if that doesnt satisfy you then think about buying a new pc.

 

Thanks for the reply, the reason I was thinking of changing the processor to a pentium 3 is because I read that the FSB on the celeron is only 66mhz but the pentium 3 is up to 133 mhz which should be better for gaming and video editing. Am I right , and would the difference be worth it?
Thanks

 

the front side bus would make little difference. the biggest improvement would be upgrading your video card. and its way cheaper then a new chip.

 

Thanks for all the advice, I'm just trying to see how far I can push my pc before spending a lot of money on a new one. I don't have an AGP slot, But I did a performance check and I'm overclocking a little, should be 1.3ghz 100mhz FSB, but I'm running at 1.33 and 102. Not much but it's a lot faster than the last time I checked. Thanks again.