Bnechmarks GPU

Using square matrix (NxN)

N K20 time_ms (GFlop/s) k40 time_ms (GFlop/s)
1000 8.349 ( 239.55) 5.915 (338.15)
2000 64.629 (247.57) 45.403 (352.40)
4000 491.310 (260.53) 348.723 (367.05)
6000 1746.502 (247.35) 1229.593 (351.34)

Peak performance

K20K40
1040 Gflops/s1210 Glops/s