Lately I've been having issues keeping all my miners going reliably. After a variable period of time-sometimes a week, sometimes a few hours-of mining, several workers on each of my rigs at my main location will bomb out. Guiminer reports the issue as "connection problems." Oftentimes one or more workers will continue to mine successfully on the affected rigs.

The rigs themselves are still connected to the internet, and are accessed remotely via logmein each time this issue occurs. I've only been able to resolve the issue by switching pools thus far. Temps are in the mid 70s for all affected cards, so I'm assuming that isn't an issue. What the heck is my problem?

I'm having one heck of a fun time trying to get more than 3 cards running on my various mining rigs. I'm using 3 Biostar A870 boards with both powered and unpowered PCI-E x1 and x16 extender cables.

2 boards are populated with 4 reference 6970s each, and are powered by Kingwin 1000 watt 80 plus gold PSUs. Running up to 3 cards works w/o issue, but using 4 sends my hashrate through the floor. MSI Afterburner also stops working.

The third rig uses 4 1 GB 6950s, and an NZXT Hale 850w PSU. This rig won't even detect 4 cards, but like the first, using 3 is fine.

What's happening, and what can I do to fix it?

I'm having one heck of a fun time trying to get more than 3 cards running on my various mining rigs. I'm using 3 Biostar A870 boards with both powered and unpowered PCI-E x1 and x16 extender cables.

2 boards are populated with 4 reference 6970s each, and are powered by Kingwin 1000 watt 80 plus gold PSUs. Running up to 3 cards works w/o issue, but using 4 sends my hashrate through the floor. MSI Afterburner also stops working.

The third rig uses 4 1 GB 6950s, and an NZXT Hale 850w PSU. This rig won't even detect 4 cards, but like the first, using 3 is fine.

What's happening, and what can I do to fix it?

A friend and I are starting up a large mining farm.. looking to start out with 10/15 GH/s, possibly more beyond that. At what point does solo mining make sense? I could see us going as high as 25/35 GH/s, maybe even more, if solo'ing was feasible.