Im testing it to see but so far so good. Not a huge gain though

10.2
Four R9 290's (i know) all over clocked a bit
Sapphire Vapor-X ~850h/s
Sapphire Tri-X ~850h/s
2x PNY ~815h/s

v11
Vapor-X ~875h/s
Tri-X 855h/s
2x PNY ~830h/s

Not a huge gain but not bad for the same default settings and same overclocks except for the Tri-X.

The Tri-X with the same overclock as on 10.2 was only giving ~750H/s. Upped it 50 clock and 50mem and it shot up to the 855H/s.  Figured Ill run a bit of a stability test on it before pushing any further
.

Not a huge gain but hey cant complain about more hash power