| Time | Implementation | Compiler | Benchmark date | SUPERCOP version |
| 2959800 | ref-karatsuba | gcc -funroll-loops -march=native -mcpu=native -O2 | 20161214 | 20161026 |
| 3519140 | ref-karatsuba | gcc -funroll-loops -march=native -mcpu=native -O3 | 20161214 | 20161026 |
| 3535900 | ref-karatsuba | gcc -march=native -mcpu=native -O2 | 20161214 | 20161026 |
| 3754560 | ref-karatsuba | gcc -march=native -mcpu=native -O3 | 20161214 | 20161026 |
| 4316280 | ref-karatsuba | gcc -funroll-loops -march=native -mcpu=native -Os | 20161214 | 20161026 |
| 4431000 | ref-karatsuba | gcc -march=native -mcpu=native -Os | 20161214 | 20161026 |