My rule of thumb from a few years ago: given the same semiconductor process, you roughly have a 40x area difference between ASIC and FPGA for the same amount of

My rule of thumb from a few years ago: given the same semiconductor process, you roughly have a 40x area difference between ASIC and FPGA for the same amount of random logic. There are few things that can be done very well on a FPGA, but most things are not, and the market for it tiny. If you really have an application that's perfect for a CPU/FPGA combo, just buy a PCIe card with a beefy FPGA. It will cost you, but the development of the FPGA logic will cost way more.