No the previous poster has not described a FPGA, but a FPGA-like device that contains much more complex fixed-function blocks than the small DSP multipliers tha

No the previous poster has not described a FPGA, but a FPGA-like device that contains much more complex fixed-function blocks than the small DSP multipliers that are available in the currently existing FPGAs. With 18-bit integer multipliers or the like you cannot compete in energy efficiency with the arithmetic execution units of a GPU. The so-called CGRAs are an attempt to revive the idea of reconfigurable dataflow processors, with the hope of combining in the same device the advantages of the FPGAs with the advantages of the GPUs.