"Считает FFT на частоте ..." означает выполнение Radix-1 операций
комплексных перемножений за один такт указанной частоты (~650 MHz).
"This core is designed around a Radix-32 butterfly architecture. With equal performance, the memory resources and bandwidth required by our core are five times less than a design comprising five Radix-2 cores in parallel."