So i tried it on several rigs,
-i 0 is fine - the same hashrate as V2.0, but much less CPU usage
-i 1 hashrate the same or aprox. 1% more, CPU usage 5% less than in V2.0
-i 2 a lot of problems (my CPU mostly Celeron G1840)
- some rigs - OpenCL error #101 - -61 and hashrate 0
- other rigs - many messages GPU returned incorrect data!
- otherwise hashrate 1-3% more, CPU usage aprox. 5% more than in V2.0