Quote from: xstr8guy on January 16, 2014, 03:30:31 AM

Quote from: allinvain on January 16, 2014, 02:53:58 AM

Quote from: bkpduke on January 15, 2014, 03:22:20 PM

Quote from: allinvain on January 15, 2014, 01:13:11 PM

Quote from: Xian01 on January 15, 2014, 05:47:53 AM

Quote from: allinvain on January 15, 2014, 03:38:46 AM

Believe it or not I'm running one full rig with a seasonic 550 watt 80 plus gold psu

I suspect this is the cause of all your problems right here Sad

That's BARELY enough to power a full rig.

I <3 anything Corsair in the 850W range for these guys.

I don't think that's true though. According to my power meter a full rig with v2.3 h-cards (the pci ones) is consuming 450 watts at 520 gh. 450 watts is at the wall of course.

But I still think that it would likely be better to give the power supply more room to breathe. Voltage ripple on the 12V rail is likely to occur more frequently at higher loads and the h-cards may not like this.

I think another solution would be to trim down the full rig by 4 h-cards. I was told by punin (from Bitfury Strikes Back -bfsb) that 12 h-cards is a more stable config.

Keep in mind that you are asking these PSUs to push all that power over the 12V PCI-Express power leads. They were NOT designed to do this. They were instead designed to push about 50% of their power over the main ATX connector to a motherboard. That is why you need PSUs that are spec'd far above what the actual power draw is on a full rig -- the 12V rails for the PCI-Express power leads were never designed with that in mind.

Well you may be right or not, but personally I'm not so sure if PSU are designed to push 50% of their power to the mobo. That would be a LOT of power to serve the needs of the motherboard and cpu. From my understanding with a single rail design it should not matter which connectors are being used as they are all drawing from the same rail. Also these days GPUs are the biggest power hogs so the PCIE express connectors usually draw the most power by a long shot.

What a horrible flaky design these bitfury rigs are. Why could they not have included more PCIE connectors to spread the load more evenly or even make use of the mobo CPU connector - anything to ensure that the m-boards and thus the cards get reliable power.

Right now one v3 m-board rig is being powered by an AX860 PSU and another v2.3 m-board rig is being powered by a 1000W OCZ EliteXtreme PSU. I wish I know if these were adequate.

However even with a 1000w supply (single rail) the rig is not stable. I think the main cause of instability is running all 16 cards at once. I am going to look into splitting up my rigs as I'm tired of constantly having to mess with these miners. I may as well just give up and buy a KNCMiner Jupiter.

lol, anyone want to swap hardware Wink

?

Luckily I have some extra M boards. I can't get more than 12 in my V.1 rig and 14 in my V.2. Strangely, my V.2 rig became more stable when I added more cards... up to 14, that is.

Yep, well thanks for confirming it. This pretty much tells me what I need to do soon - get extra m-board and take out 4 cards from each full rig, that way I'll have two 12 card rigs and one 8 card rig.

These rigs run on smoke and magic apparently.

It would be nice if Dave sold m-boards by themselves as well.