Well at $188 for CAS 8, it's no bargain.
here's CAS 7 for same price:http://www.newegg.com/Product/Product.aspx?Item=N82E16820226104
As for what works in what, it's pretty much a crap shoot. Have you checked the MoBo vendors QVL (qualified vendor list) ? If it's on there, at leats you know it has been tested.
The 10 newegg reviews are all positive but most of the raves were reserved for the blinky LED's