Could the x299 motherboard type fit inside the Alienware X51 R2 case?

[virgil81]

Could the below motherboard fit inside an alienware x51 r2 case?
This is the motherboard: ASRock Fatal1ty X299 Professional Gaming i9 XE Socket 2066

 

[Dark Lord of Tech]

No it won't , not compatible.

 

[virgil81]

Thank you.