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Help with new 770m upgrade

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Just installed modded bios for my Alienware M18x, installed the GTX770m into the MXM slot and Posted it up, 8 beeps. Took card out, forced iGFX and re-installed card. System boots but doesn't see card listed under discrete graphics. 

Continued to Windows 10, lists two unknown devices, VEN_SMO&DEV_8800 and VEN_CPL&DEV_2200, 

I'm beginning to think its possible the 770m could be defective? I know its the Dell P/N version that's known to be compatible with this laptop. Any advisory would be appreciated! 

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