Quote from: AizenSou on June 18, 2014, 09:13:58 PM

Quote from: Karma.ITM on June 18, 2014, 05:57:08 PM

Quote from: AizenSou on June 18, 2014, 05:29:06 PM

I have the same problem with Linux, but not every H81 BTC Pro board. ccminer crashed when using 6 cards and only with a few algos, e.g. JPC,NIST5.
X11 works without problem. So I found out that not every H81 BTC Pro Board has the same build quality. The reboot indicates that something wrong with the power connects to the board.
I know it's really stupid but I tried a lot of combination last months to find the problem. (I have 6 H81 BTC Pro boards).

I'm thinking about buying a H81 BTC Pro and hopefully I don't run into any issues.

Did you also give power to BOTH of the molex connectors on the motherboard? I know some people say "you don't need to if you're supplying power to the risers!" but it's always good to plug it in and test in case you haven't.

Quote from: canigetanipa on June 18, 2014, 06:20:13 PM

I run a H81 BTC Pro with 6 EVGA 750Ti's (without the 6-pin PCI-E power), I have 5 cards on 16x-1x powered risers, and the 1 card in the x16 slot on a 16x-16x unpowered riser. Rig has been running flawelessly for nearly 4 months now!

Of course I need to plug two molex connectors to the board otherwise the board autorestarts itself if you run ccminer/cudaminer for every algo.
I have 6 of this board and only two of them still giving me trouble. The worst algo is JPC in my experience.
I use for all card USB power riser from same brand, but I notice from those Chinese quality you can't expect much.
I still have found out the reason for these 2 trouble boards, but from my test I can conclude that ccminer/cudaminer works fine.

There shouldn't be any need for those mobo molex connectors to be connected if you're using all usb risers. Not sure why yours wouldn't run without them. I have 2 rigs on version 1 and 2 of the H81 and they both go at full speed with no problems and I'm not using the connectors. I made the mistake of buying all my Ti's with 6-pin, so I have wires everywhere, but no power is going to pci since all but the x16 slots are usb risers, which don't get the power from the slots.

I think some people might have weak power supplies or are trying to power cards with no 6 pin connector off of 1 accessory line from the power supply. Do NOT power more than 1 card with the same string of molex or sata connectors if you're using cards without a 6 pin. Even with 6 pin, only power 2 at max. Those lines can safely power 75w, but much more and you're asking for trouble. That's why I think some people's cards drop once they start mining.

I've also noticed that running this board with mismatched ram (4gb+2gb) doesn't seem to work that well, so I've just put 1x8gb stick in each one and they have been fine since. I don't think I was able to get all cards to stay working with 4gb before on Cudaminer. With ccminer that has probably changed, but this was a while back. They have been rock solid for months the way they are configured. FYI, both have i3 processors to help keep cpu utilization down as well as save power versus a celeron that would probably be using 10% more at all times.