Xtreat, awesome setup! While we're showing off our mining rigs, here's a story about my humble 3 Mhash rig. It's a multipurpose miner/gaming rig/media center/multi-monitor workstation. Best of all, it's quiet!
I've taken a sort of "hobbyist" approach, having started mining bitcoins with an old Radeon 4870 late 2012/early 2013. I then bought a bunch of coins last April and the rest is history. Actually, my last big purchase was from MtGox just days before DHL seized their Dwolla account. That was a close one.
I kept the 4870 running through the summer but during the asic difficulty jumps I turned it off. In November just before the altcoin craze I grabbed a 7990 but quickly realized that they run super hot and sound like a jet engine. My office is right next to the living room and my wife wasn't having it. I mined quite a lot of DOGE with that single setup, which proved to be profitable.
Enter an additional 7990, a couple of water blocks, and radiators. To save power I undervolted each core to where it was *barely* stable @ 1100/1500. Cards run in the low-mid 60s, but will probably be closer to 70 when summer hits. Over on the LTC forums I found a custom cgminer kernel that boosted my cards from 760 to 780Mh/s. Cool stuff. To play games I simply turn off 2 cores and push them back up to stock 1.2V. I use MSI Afterburner to switch between different profiles.
To get the four cores to run stable, I threw in an EVGA power boost. Nice little device, that. I also sold the PSU and replaced it with the much quieter (and more efficient) Corsair AX1200i. It is rock solid and the cards love the digital voltage regulation. The real-time power monitoring software is excellent and the fan barely spins (~1000rpm) at near full load. The peace of mind is worth it, knowing that I don't have anything that's overheating or being pushed to its thermal limits.
So you can see I'm not exactly in it for the money, although I pull in between .5 and .75 LTC per day which I use for fun money and trading. I don't mine any altcoin except DOGE; not really keen on downloading unknown wallet software. It's been a fun project to tackle (watercooling can be a bitch) and I'll probably keep it running until its no longer profitable or dumps too much heat during the summer.
And the mandatory cgminer screenshot. Hardware errors? Yeah, that's due to the undervolt. I mentioned that they are just barely stable running between 1.11 and 1.16V @ 1100/1500, so I get a few per 24 hour period. My rejected shares have also gone down significantly since upgrading to the digital PSU.
Thanks for reading and letting me share!
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