So I wanted to test the new GPU RTX3090 from NVIDIA. I created simple software in OpenCL C++, which is comparing single threaded CPU execution and GPU execution of Newton's method.
Just iterate 30,000 times.
Speed up in comparison with single thread on CPU is ~ 4200 times and when considering that CPU frequency is 3.8 Ghz and GPU core frequency is 1.7 GHz, theoretical speed up is 4204.213465 * 3.8 / 1.7 ~ 9397.65, which is very close to amount of GPU cores RTX 3090 has (10496).
Pretty impressive GPU :).