Im running 2 x 7950's for my First Rig. I will be building a 2nd Rig next week this time using a test bench case to double my hash rate. The rig pulls a max of approximately 600watts but normally runs just over 500 watts.
My Rig is currently pulling between 1000kh/s and 1300kh/s. GPU 0 appears to run 10c hotter than GPU1 at 81c but I am fairly comfortable with this temp. Just won't allow it to run any hotter. One tip for you all. If the temp of one of your GPU's is too high then set your powertune setting to a minus value like -10 and you will see the temp drop down. Better to lose a bit of speed than burn the GPU.
Kit List is as follows for my Rig:
2 x Sapphire AMD HD7950 Flex OC Graphics Card – 3GB (GPU’s) - HD7950?s are good for mining as they are relatively low power consumption but high hash rate
Cool Master RC-902XB-KKN1 HAF XB CASE – This is an awesome case. It has plenty of room for the GPU’s and has plenty of air cooling
Sandisk 64GB SSD – Solid State Drive – SDSSDP-064G-G25 – A fast 64Gb hard disk that is plenty of space for the OS
CORSAIR 850W CMPSU-850AXUK - A top end PSU that will easily power both GPU’s with spare wattage left over. Modular design means tidier cables
16GB (2x8GB) Corsair DDR3 Vengeance, PC3-12800 (1600),Non-ECC Unbuffered - 16Gb Memory (overkill but I may use one stick when I build a 2nd mining rig)
AMD Sempron 190 Dual Core Processor - Low wattage CPU ( Only 45 watts )
MSI 990FXA-GD65 AMD 990FX MoBo - Motherboard that will support 2 x PCI-e 16 Cards as well as supporting crossfire
Noctua NH-U9B SE2 Dual Fan – Fan to cool down CPU. Better than stock CPU fan with quieter fan.
Arctic Silver5 THERMAL PASTE – For application to CPU
ScanFX TIM Cleaner – For CPU in case I need to re-apply thermal paste
2 x FDesign FD-FAN-SSR2-120 120 R2 – Quiet Fans for PC case to replace stock fans
200mm CMaster MegaFlow BlueLED – Quiet Fan for PC case. Case does not include 200mm fan.
Energy Plug Meter – To measure wattage that Mining Rig is drawing from the mains. This allows me to work out energy costs so I can project profits.