This thread is very helpful. I previously bought from cablesaurus for my dedicated mining rig and thought it was a little pricey, but it worked, so I soon forgot. Now that prices are so low I'm pinching pennies. Still, I'd like to add 2 5870s to a 2u server I've got running for other purposes. Call me stupid for throwing $ at a mining rig, but I'm an ardent believer in Bitcoins.

Adequate power to the cards and the mobo is not an issue, but connecting the cards is. The Mobo has 2 8xPCI-e connectors (http://www.supermicro.com/Aplus/motherboard/Opteron2000/MCP55/H8DM3-2.cfm)

So I'm thing that 2 of these 8x to 16x cable 'adapters' would do the trick: http://www.9mart.com/products/2-Lots-PCI%252dExpress-Extension-Cable-8x-To-16x-Riser-Card-For-1U%7B47%7D2U.html

Thanks, and any advice from hardened miners is very welcome. Gotta watch those Btc lately!