with stock settings…
have you tested switching their places? always GPU1 dies.
ya, i tried switching cards in several slots, but u see in first post, all cards died after a while 
what do u think? Mainboard or gpus are broken.?
Upgrade your hiveos amd restart.
I’m having the same sorts of issues. Been a nightmare. I’m coming around to think it’s just the BIOS and MB’s are too old.
Thanks to all guys.
I’ve bought a new MB - surprise - it works fine!
I had a new XT - was running it on very old hardware (mobo) - couldn’t get it to work at all on Hive - even tried several rigs. Tried lots of suggested fixes, go back to old Hive stable version, try new version, try beta version., tried various versions of various miners … …kept showing dead gpu …I had to return it to shop - they tested it (Windows) - worked fine. - I got my money back. I’ve just bought a 6600 (not xt), booted up and running straight away without any difficulty whatsoever.
I did see a couple days ago, Youtube vid, maybe on Rabid Mining, or Red Panda, that they had been having difficulty with a 6600 (not sure which version) but they had to change the bios setting for the PCIE to Gen 1 ?, as the other versions gen 2/3 wouldn’t allow to the GPU to boot in Hive. Don’t know if this helps someone. Anyway, if you can get 'em to run, 6600 nice card, 28.76# , 46w (core 900, core volt 620, MemCV 620, MemCl 950, MemV 1100)
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i set to gen2, it runs perfect.
tomorrow the 5th card follow, and i bought two msi non-xt 5 mins ago 
Good luck to all.
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I wanted to put all my Fighter Cards into one rig from working rigs. That was the start of a 4 day nightmare of total confusion. At the end of it all I went back to keeping the 6600XT’s away from the 6600 and my World is happy again. Also had to raise the VDDCI from 660 (worked previously) to 720 on the XT’s. I wonder if I’d set 720 in the mixed Fighter rig if it might have worked.
It seem that I also had similar porblem, after 2 weeks of trying, something helped, but I don’t know what exactly. What I did is:
- Use Hive OS beta/not yet stable version
- Power risers from VGA (using splitters only), GPUs were on VGA before
- Change teamredminer to lolminer
- Pcie gen set to auto
- Started tunning cards from no OC and getting to final settings using small steps (12mV on all voltages).
I think that 2. or 3. were most probable gamechangers.
What is that previous mobo you were using? And what is the new one?
I’m also having a headache around these 6600 non-xt, crashes and errors all the time!
which miner?
Latest version of hiveos and teamblackminer. Ethermine seems to be picking up the increased hashtate.
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You have limited PCIE lanes using a AMD Athlon 3000G;
“Athlon 3000G has 6x PCI lanes, Integrated Vega graphics uses 2 lanes only leaving 4 lanes for external GPUs”.
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Getting nearly 1mh more on black miner instead of NB miner, but getting more rejected and stale shares (98.75% average)