anything 535 will work with the p40 and with patches you can use 17.5 / 550 - 553 drivers. (which spoofs it as a A5500 via unlock)
more details in this thread on all the patches, posts, etc...
Is that version the most recent one that worked for you? I am on 535.161.07 on my P40 and I want to try newer versions like 535.230.02.
https://cloud.google.com/compute/docs/gpus/grid-drivers-table
Like.
anything 535 will work with the p40 and with patches you can use 17.5 / 550 - 553 drivers. (which spoofs it as a A5500 via unlock) more details in this thread on all the patches, posts, etc...