however - the 6 card issue is ONLY with the 980ti cards ... it seems even the amd 280x oc / 7970 cards ( one and the same ) never had that issue either ... 6 cards and no problem ...
im sure its a bios issue - as ive seen 8 gpus in a single system run by an expensive supermicro motherboard designed ( with a large capable bios ) for such things in hpc servers ...
but i will research your suggestion - as it could also be an issue with the way the 6th 980ti card is allocated in the bios / motherboard ...
tanx ...
#crysx
I like puzzles like this. Have you had 6 cards working in the same rig as the one currently failing with 6x 980ti?
A rig that previously worked would have the correct BIOS settings already.
I'll jump ahead assuming you have already proven your HW and SW and know where I'm leading, It may be the number
and model of card that is the problem. 980ti's have
6 GB mem so that is
36 GB to support. Just speculating, I don't know if adding RAM or swap would help.
if you're not yet fully invested in the 980ti you may want to wait a week for the 1080
I believe
this is the 980Ti problem ( V 6th card ) . ( but that's for the miner. And if OS do not see 6th card - jumped riser might help.
Any time I cross a power of 2 boundary I get scared. 5 cards keeps it to 32 GiB.
you know ... its funny that i cant remember whether i DID test it on a different motherboard or not ... which would usually indicate that i didnt ...
so im going to pull one of the other motherboards from the previously working 6card 750ti systems - and replace the current motherboard for a test with the 980ti systems ...
i have it still for another few weeks before i have to give it back - so better now than never i guess ...
if anyone has successfully run 6 x 980ti ( whichever brand ) cards in one machine - i would appreciate you contacting me ...
#crysx
Your lucky I only get 2 980ti 1 970 and 1 750ti max
Of course its a 2 core cpu.
If I had a 4 core it would work with 5 cards no more imo.
So you may need a higher core.
My 970 is a paperweight and I'll never buy another one and I'll never buy ANTEC psu ever again.
So I had 2 problems. And the 970 clocks are at 1519 ghz I even tried underclocking -280 ghz no luck.
Someone posted about a 2 core doing good on something ..I cant find it.. they where wrong if they put more cards in.
Ps I think you need a bigger psu
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It switchs over when high price but 90% of the time is here. 
