I can't answer the GPU comparison question, but I can answer the question of what you "can" do on a FPGA. Here are some example cores for FPGAs: http://opencore

I can't answer the GPU comparison question, but I can answer the question of what you "can" do on a FPGA. Here are some example cores for FPGAs: http://opencores.org/projects http://opencores.org/projects Hopefully, by browsing that list, you can see how FPGAs aren't really directly comparable to something like a GPU.