And btw. Stale shares; maybe its a Pool "problem"?! I was mining with my 2 Cards for 2 Weeks+ now on unminable.com, and had 1(!) Staleshare over the time. Binance Pool gave me with same Overclock about 2-3%.
Yes.
2-3% stale, and you cannot mine on the optimal speeds (high intensity). So changing the pool can give you +5% poolside speed.