The following mining rig does 10.5+ MH/s mining scrypt using 12 Sapphire R9 290s:
It’s list of components is quite impressive:
- 12x Sapphire R9 290 Battlefield 4 Edition GPUs
- 3x Corsair Neutron 64GB SSD Hard Drives
- 4x Rosewill Lightning 1300W Power Supplies
- Microsoft Windows 8.1 Enterprise Pro 64 bit
Windows 8.1 gives full access to using 6 graphics cards per motherboard without resorting to Linux (BAMT), while the 64GB SSD drives are a good choice for keeping the power draw to a minimum for your main storage drives.
But the worry about using so many 290s is that your energy costs are going to be sky-high: there’s 4 power supplies, each at 1300 watts, so maybe the seller has a solution:
This would be a perfect addition to anyone currently mining or for someone looking to break into mining with access to free and/or low cost internet and electricity.
“Free and/or low cost electricity” is exactly what you’re going to need in order to be profitable with a rig like this. If you want to mine at 13 MH/s and keep your energy draw below 1000W, check out the Spider from GAW Miners.