Hi:
The problem is you bought ECC memory.
ECC memory is not compatible with any dc7xxx or 8xxx Elite desktop PC's.
This is what you got based on the item number you posted.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148440
You need to buy non-ECC, unbuffered memory.
This is the memory I installed in my 8000 Elite:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231422
If you want the crucial brand you need this model...
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148347