For comparison of cpu usage, Driver 436.02 vs Driver 430.64 took a few days to identify that new drivers were overloading cpu.
this is really strange, but on my pc there is no difference in cpu load for both versions. no idea why it is so? might be the reason I'm using 1080ti not the new version of nvidia cards with this modern tensor cores?
also I have to mention that performance change is very low, so basically no need to upgrade imo, better save time and stay with current version.