Interesting project! Well, good luck with it. If you're using HPC Linpack, that could be a x2 multiplier difference between your results and my napkin math, as

Interesting project! Well, good luck with it. If you're using HPC Linpack, that could be a x2 multiplier difference between your results and my napkin math, as I've been assuming 32-bit Floats, while Linpack is 64-bit Floats IIRC.