OpenCL support for FPGAs is super limited and only done through vendor specific tools. The point of these tools is more to LET you write your FPGA program that runs outside of a desktop computer in OpenCL than it is to make an FPGA be able to speed up your OpenCL program running on a desktop. So it is not like 'I will pop in a new FPGA card so I can play better games.' Though that is what i want to happen in the next...... lets say 5-10 years.