These are 3/4" square 3ft long wood dowels found at Home Depot/Lowes and many other places. I used some nicer 1-1/2in white washer-head #8 cabinet screws that have the star driver with them. Be sure and screw them in so the head is flush and not pushing into the wood. They look nicer and clean.
The case is based off the Litecoin/Dogecoin design (Link below). I made some minor adjustments to give a little more room for the power supplies to sit. But the base configuration will work just fine. You can attach two power supplies to this setup if you need.
(Back View Above)
Motherboard and SSD attached to case. Be sure and align the motherboard so the PCIe slots are in the middle of the case as much as possible.
I used the standard motherboard case screws (gold posts) to hold the motherboard in place. I drilled a small hole and then screwed them in. Next time I would use a little gorilla glue to help hold them in place.
(Front View)
The two GTX 980 and Asus Strix 980 Ti video cards attached to the case. I am still testing the PCIe 1x to 16 adapter that you can see connected to the left card. So far I am seeing only minor PPD differences.
For the two additional GPU's I am using the EZDIY PCIe 16x extension cables (Black cable shown above and below). These are some of the best cables I have seen. Good solid solders. Completely shielded. And both ends have locking connectors. They are about 11 inches long which provides ample length to reach most of your GPUs.
To do more than one power supply you can use the Add2PSU Multiple Power Supply Adapter (Displayed Above). This connects the two power supplies in a way so when you power on/off the primary supply it will power on/off the secondary. This can be helpful with multi GPU systems and save some money as two 850 watt power supplies can be cheaper than a single 1200watt or even 1600 watt supply.
I am using a EVGA 1000GQ 1000watt 80+ Gold power supply. It can be found on Amazon for $130. This is a modular power supply that can handle, and has cables, for four GPUs. I am currently pulling 720watts from the wall at max output.
You can see there still is space for a second power supply. You can also increase the size of the open air case when you build it if you need more space.
And here is the system in action for the last month. The GPUs are running at around 52 celsius with fan speeds of 65% on the GTX 980 Ti and 70% on the GTX 980 reference cards. I am currently doing on average 1.45 million PPD. This is a mix of core 18 and 21. With all core 21 for the day I have seen upwards of 1.7 million PPD. From what I have read I can probably do more on a faster Intel machine. I will build one of those next along with the GTX 1080's when they become more available.
This open air case is cheap to make. Very solid. Offers a way to expand cheaper. And keeps your overclocked GPUs a lot cooler without requiring all the extra fans and water cooling. These run 24x7 without any issues.
Below are the links for how to build your own Open Air Case along with all the parts I used in my build.
Case & Adapters:
Wood Open Air case: http://highoncoins.com/litecoin-rig/how ... ecoin-rig/
EVGA 1000w Power supply: http://amzn.com/B017ICWP82
Add2PSU Multiple Power Supply Adapter: http://amzn.com/B009P98Q8U
EZDIY PCI Express 16x Extension Cable: https://amzn.com/B01EL4EAUG
PCIe 1x to 16x Extension Cable: http://amzn.com/B00EX627A8
PC:
Gigabyte 990FXA-UD5 Motherboard
AMD FX-8350 CPU
2 x Kingston 4GB DDR 1600
Samsung 850 EVO 120GB SSD
GPUs:
2 x Nvidia GTX 980 Reference (+200/+400mem overclock)
1 x Asus Strix GTX 980Ti OC (+20 overclock)
OS & drivers:
Ubuntu 14.04
Nvidia 361.42 (Need the newer driver for GTX 980Ti to control fan, overclock controls on Linux)
If you have any questions or need help with anything please feel free to ask away. I will be glad to help.
Brad
UPDATE: Updated the EZDIY extension cable Amazon link.
