GPU matlab test performance worst than CPU - Who knows why?

I followed this instructions to test and compare performance between GPU e CPU. I have a NVIDIA GeForce RTX 2070 running with matlab R2017b

Measuring GPU Performance - MATLAB & Simulink Example - MathWorks Nordic.

Somebody has a suggestion about what is wrong? GPU was not properly working ? GPU is really worst than CPU in my case?

Answer 1

[Jason Ross]

Like other GeForce cards, double precision performance is significantly less than single precision performance. According to this Wikipedia page, GFLOPS for a RTX 2070 doing double precision math max out at 200-250 GFLOPS depending on model and if it's using boost. If you used singles you should be seeing more like 6500-8000. The card used in that example was a K40c, which can do 1430–1680 GFLOPS double precision.

There are similar other charts on Wikipedia for other GPUs that show their performance results.