https://bitcointalk.org/index.php?topic=539931.msg5937364#msg5937364

but below somone sais he got it to work. so im not sure and i went too far by saying it doesnt work xD
my experience, i have 3 h81 but only tried to install one of them the whole day..
with more than 4 gpus i always got a black boot screen, system hangs, not even numlock works
i tried all other 5 hdmi ports more than once, no screen,
so i changed rises with same results.
now when i removed a gpu the system booted.. i was happy at least 4 gpus installed
but mining crashed after a couple of seconds with system hang and gpu vents not working.
i googled and found the link above...
@ the h61 i installed everything and 5 gpu work no problem, with 2 psu. 6th is a little tricky
however, with 3 gpu and only one 750w gpu @h81 i have no problem. but thats not what i had hoped for when considering the h81 over the h61 ...
i maybe try to bios update and options tomorrow but i really dont wanna fry it, i would rather change it for a h61



yeah ive read the h81 need a bigger psu to work, and the need to be on the same ground.
so yes, with the right settup it might work well.. 2x 750w psu, no luck for me :/

Can you explain this in details, I am going to use one server PSU for cards and one PC PSU for H81 BTC Pro just bought. Any issues?

If miner is not available, it becomes red. Why do you need ping?

Is this string needed "setx CL_DEVICE_MAX_MEM_ALLOC_SIZE 2147483648" - this is new to me ....

Btw, have you consulted the MRR admins for help?

Set up two identical rigs, one with the latest catalyst drivers and one with the recommended v15.12, it would seem after 24 hrs that the v15.12 drivers are outperforming the latest drivers.

Cards are R9 Nano's.

..is this the expected result?