Asus GTX670-DC2T-2GD5 vs Radeon R9 280X

[Rokain]

Hi All,

I just signed up on this forum and decided to post my question in here.
Currently I scrypt mine at ~ 200khash/s with a Asus GTX670-DC2T-2GD5.

I am aware that mining with a NVidia card isn't that common to do.
Will it increase my khash/s much when I use a Radeon R9 280x?

Anyone who has experience with mining with this card or any other suggestions are welcome!

Thanks in advance.