Can anyone find any information about the r9 m270 dgpu in the new lenovo y40?

I have heard that it's a rebrand of the 8850m dgpu but said it was comparable to nvidia gt 755m. So i check on notebookchecker and found both of these card are far from each other in ranking leading me to question whether or not this laptop is even worth the price. I have chatted with a lenovo rep and the answer is "it's powerful"… So yeah i'm in need of a laptop and i want it to last i do some light gaming plus other software such as photoshop and coredraw. Is the y40 worth it for it price? Look very nice though but i'm not gonna pay premium for look. I also take in the factor of it's small size which i really like since i'm not at home a lot. I also take into consideration of next gen api mantle would this card be benefit that if i also play games? Sorry long post thanks for reading this far. Any info would be awesome.