My friend decided he wanted to start gaming on his PC so I offered him my old HD 7870. Thing is he has an OCZ modxtreme 700w PSU. It has two 8 pin slots but the GPU I gave him has two 6 pin slots. I think this cable "might" work but wanted to check here to be sure.
http://www.newegg.com/Product/Product.aspx?Item=N82E16812200420&cm_re=6_to_8_Pin_PCI-Express-_-12-200-420-_-Product
http://www.newegg.com/Product/Product.aspx?Item=N82E16812200420&cm_re=6_to_8_Pin_PCI-Express-_-12-200-420-_-Product