I offer a 30 darkcoin Bounty to someone abble to fix my problem with my R9 290.
Summary: my cards started at 2.4MH/S and after 10 minutes they loose 10% and are stable at 2.1MH/S
This happened on all my cards, on all motherboards, under BAMT.
I noticed all the cards have the drop on the exact same second (on one motherboard of course).
I have 2 other cards on windows 8.1 that are stable at 2.5MH and from time to tim (this morning) I have the same drop (watercooling cards)
When the drop happened, the only way to recover the lost hash is to shutdown the machine (a mine restart did not do the job: I don't have higher hashrate)
If I put another card on the same rig, after 10 min, all the 290 will have a drop, and the other card (7950/270/7970) will not have any loss.
If I use thoses cards to mine Scrypt coins, no drop.
Maybe your cards are just running too hot after 10 minutes, so card power management lower frequency to stay within TPD. Monitor card frequency for some time to see if this is the case. If yes you need to increase Power limit settings to 20% in Catalyst Control Center or in config file.
The cards are listed as 50° in BAMT. I already tryed to put Powertune to 20 (even 30) without a single change.
I really can't understand why other don't have this problem...I agree to use the same miners on BAMT, my cards are Sapphire 290, and all of them have the same problem, no matter what motherboard they are plugged in.
How could it be possible that all 3 have a 0.2Mh loss at the exact same second every time I reboot?
Why only my 290 cards and not the other cards on the rig?
Why only a hard reboot can fix this?
How cold I found an answer under linu BAMT?
Why only on Darkcoin, and not on Vertcoin/Keccack/Scrypt?
