First off "new shell" do you mean motherboard ?
You didn't describe your present card so i'll asume it a PCI.
The answer is yes if you get the right motherbord with AGP or PCI slots.
Thanks. I'm actually upgrading my old P3 733Mhz and was going to get a new MB/CPU etc. but don't have the money as yet to upgrade my GPU. My current Graphics card is AGP but i was worried that with new MB only capatible with 4x/8x AGP cards, it might not work.