Ну да "Floating point was even more complex, since there was some overlap between the CPU and the floating-point processor, but in general, floating point was significantly slower. A single-precision floating add instruction could range from 2.4 to 5.5 microseconds plus time to fetch the operands."
БЭСМ-6
"Совмещённое АУ для целой и плавающей арифметики." - 1 MIPS, 0.418 MFLOPS, 48-bit processor (существовали и 64 разрядные версии).