Looks like fixed fan speed works OK now. I'm using 48% for both cards.
I'm trying to make the miner auto switch to the most profitable coin among X11/X13/X15 algos, but nothing really works as intended. First I tried to use TMBSwitcher 1.01 but miner idles for more than 1h waiting for work from pool sometimes. I tried using 4010/4011 ports and somehow miner quit after some time. Now I'm trying with 4440/5550/6660 but miner just runs X11 algo when X15 is most profitable and don't know how to make it autoswitch to X15 (bullus' config had default X11 kernel but I deleted that string from config).
Don't know if you modified the tmb-switcher.conf yet, but you need to add a couple lines.
#Defined Mining Algorithms
[Algorithms]
nscrypt = false
scrypt = false
x11 = true
x13 = true
x15 = trueand
# For Windows, uncomment below
nscrypt = scripts\nscrypt.bat
scrypt = scripts\scrypt.bat
x11 = scripts\x11.bat
x13 = scripts\x13.bat
x15 = scripts\x15.batThen create and modify the x15.bat file in the scripts folder. I'm running the python script on windows pushing the change to my linux miners.