My R9 290 never had any improvements since V7 I'm not sure why. It got stuck to 250-260Sols even at 1100/1300

About the random restart, My rig shuts down 15 mins - 1hr after miner starts and the bad thing about it is that my pc wouldn't restart by itself unless I discharge all the PSU capacitors (disconnect from wall sockets). Good thing about this is I fixed it by getting all settings back to stock and a little Undervolt. This minimized my gains when switching v8-v9 from 20% to 10%, but it's still a good improvement nonetheless. Never had any random crashes for almost 24hrs now.

My setup is composed of 2x RX470s (1200core,2000mem) 210 sols and an R9290 (950core,1250 mem) 250 sols My PSU is AcBel R88 1100Watts 80+ Silver.  My rig is almost half of that PSU's capacity, maybe it is really that bad.