My Nvidia values and short introduction:
average values on pool over >15 cards each stable since pow fork+6h.
all Vcore at 0.8V or lower, Mem and clock in induvidual sweetspot.(e.g.  fixed 1493Mhz/+294Mhz Mem)
1050 from 310h/s to 268h/s
1050Ti from 315h/s to 272h/s
Mostly b x t changed to 24 x 15 and 33 x12. There is a lot of headroom for improvement I am just lazy
No difference in AC Powerdraw likely due already on lowest possible without modding bios

Just for start, with xmr-stak change the auto generated values for threads and blocks to exactly 50% of your previous working ones and do not round up. Change bfactor to 9 and bsleep to 100.
For the easy calc just use threads x blocks x 4 if thats above your available memory don't try it for starts.
 Then just try some different numbers with b x t.  If you never cared to find your mem to core ratio sweetspot proceed with that one first, ideally with lower t x b values, that sweet spot mostly only changes if you have an unstable card. At the end you can lower your bf/bs settings if you believe it helps freezing your system for 1-2 moar hashes

No values for vega and 1060/70/80/Ti due to not enaugh cards for an average.