PCPartPicker part list / Price breakdown by merchant / Benchmarks
| Type | Item | Price |
|---|---|---|
| CPU | Intel Celeron G1820 2.7GHz Dual-Core Processor | $48.23 @ Mwave |
| Memory | Crucial Ballistix Sport XT 4GB (1 x 4GB) DDR3-1600 Memory | $39.95 @ Amazon |
| Storage | Sandisk ReadyCache 32GB 2.5" Solid State Disk | $39.27 @ Amazon |
| Video Card | Asus Radeon R9 280X 3GB Video Card | $486.13 @ Newegg |
| Power Supply | LEPA G Series 1600W 80+ Gold Certified Fully-Modular ATX Power Supply | $297.98 @ SuperBiiz |
| Other | ASRock H81 PRO BTC | $99.99 |
| Total | ||
| Prices include shipping, taxes, and discounts when available. | $1011.55 | |
| Generated by PCPartPicker 2014-03-11 20:48 EDT-0400 |
That and 4 of these.(http://www.amazon.com/Powered-Flexible-Extender-Bitcoin-Mining/dp/B00EX627A8/ref=pd_cp_pc_1) With this and those 6850s and 7950 you should get around 1.8-2 Mh/s. EDIT: Don't use a case, open air is best for mining. A lot of people use milk crates.