With the 9.4.1 version, i get 14,5 cpd on the 290x's, but with the 10.2 version im only getting 10 ou 10,5 cpd
Do you recommend a specific driver version?
Im doing experiments with other drivers
Miner version 10.x uses file names like kernelxpm_gpu0.cl for first GPU, kernelxpm_gpu1.cl for second, etc. You can try copy kernel from miner 9.4.1 to directory with 10.2 and rename it according to rules, but it can be incompatible (for example it not works on linux with amdgpu-pro drivers) or use another drivers.
For rx470 almost all Crimson 16.x is good, 17.x and linux amdgpu-pro gives poor performance (less than 7 CPD on RX470), don't use it.