how can you tell if a motherboard supports 2x gpu for mining?

[newguy05]

Hi, what is the feature/things to look for in a motherboard to make sure it supports 2x 5950 card for mining without additional hardwarw/changes.  I want to get the cheapest you can buy but confused with all the spec pciex16 vs pciex8 etc...   

Basically if a motherboard has 2x pcie slot (doesnt matter if x16 or x8) it will support 2x 5950?   does they need to be certain distance apart?

thanks

[newguy05]

I did some more research and this is what I come up with,  can someone please tell me if this will work or if there are more efficient setups? setting up 2x rigs.  I know memory/hdd etc..are missing i have those already.  Thanks

2  AMD Sempron 140 Sargas 2.7GHz Socket AM3 45W Single-Core Processor SDX140HBGQBOX    $75.98    ($37.99 each)
2   ASRock M3A770DE AM3 AMD 770 ATX AMD Motherboard    $119.98    ($59.99 each)
4  XFX HD-695X-ZNFC Radeon HD 6950 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity    $919.96    ($229.99 each)
2  Antec EarthWatts EA750 750W Continuous Power ATX12V version 2.3 SLI Certified CrossFire Ready 80 PLUS Certified Active PFC "compatible with Core i7/Core i5" Power Supply   $159.98   ($79.99 each)

[RyNinDaCleM]

You can use ANY PCI-e slot (or PCI for that matter)! You can get adapters here>http://www.cablesaurus.com/
That said, if you don't mind having dangling cards you could cut a CPU, MoBo, and both PSUs off.
Get one of these>http://www.newegg.com/Product/Product.aspx?Item=N82E16817371039
And you'll be set for about $60 savings after MIR!