Did you realize that the Alienware 7700 (Clevo D900T) is an MXM slot video card?
Did you try buying ANY other MXM slot video to make it functional before you butchered it?
I bought my Sager brand Clevo D901C precisely for the MXM video. You went to Alienware (DELL) for an overpriced part which isn't produced anymore when you could have gone to a place like mxm-upgrade.com for a low-end card or any of the dozens of Clevo/Sager resellers and got a modern part.