1. Wait a sec here, these use $35 Sempron 145 CPUs and have 4 GB of RAM and can still hit 3,000 kH/s? Are these Litecoin only?

2. Also, the ASRock 970 EXTREME4 AM3+ AMD 970 motherboard, it has:

   3x PCI-Express 2.0 x16 Slots(one run at x8, Or two run at x8, one run at x4, Supports AMD Quad/ 3-Way/ CrossFireX/ nVidia SLI ), 2x PCI-Express 2.0 x1 Slots, 2x PCI Slots

   How do you put four video cards into a motherboard with only three full video slots?

3. If there is no case, what do you use to hold it all together?