For the newbie around who wonder: Nope. Not a chance to beat ASICs.
(The SHA256 hashing done in bitcoin is relatively simple. In an ASIC, absolutely every transistor is dedicated at this simple task. And as the task is relatively simple, you can cram tons of core computing SHA-256 on a single chip. Whereas a GPU would "waste" a lot of silicon space for transistors working for all the other important task that a GPU has to do that is of no use to do for mining. For starter, a GPU needs to push around a lot of memory and compute a lots of maths. But bitcoin mining has no use of a complex big-bandwidth memory controller nor of floating-point arithmetic units.
The story is a little bit different when you consider Scrypt and Prime mining)
Thankyou for your answer.
May MANTLE will not compete with the asics but if that can help you get more power. And yes, I think for the scrypt algorithm can be an important step forward.