Which is better "ROG G55vw GTX660m vs. Lenovo y510p GT755m SLI" for gaming?

[interference]

Hello everyone,should i upgrade from Asus ROG G55vw to a Lenovo y510p.I am looking for a mid range gaming laptop and i am really interested in this lenovo y510p is it worth it or should i look for other laptop...

My current laptop specs:
Processor: Intel® Core™ i7-3610QM (6M Cache, up to 3.30 GHz) 3th. generation
Ram:Corsair 16GB (2x8GB) DDR3 1333 MHz.
GPU:GTX660m 2GB gddr5
SSD:120GB Samsung Evo
HDD: 750GB WD 7200rpm
1920x1080 Matte display.

Here are the specs of the laptop that i want to buy..
Lenovo y510p:
Processor: Intel® Core™ i7-4700MQ (6M Cache, up to 3.40 GHz) 4th. generation.
Ram:8GB (2x4GB) - DDR3, 1600Mhz.
GPU: 2x NVIDIA 755M 2GB SLI GDDR5
HDD: 1008GB (8GB SSD + 1TB HDD SATA III 5400rpm
1920x1080 Glossy display.

 

[TechyInAZ]

Y510p is a older laptop, while it definantly has far more power, SLI isn't exactly great for a mainstream laptop (heat, power savings, and latency issues). What's your budget?

 

[interference]

Y510p is a older laptop, while it definantly has far more power, SLI isn't exactly great for a mainstream laptop (heat, power savings, and latency issues). What's your budget?

Overall i am looking for used laptop, i can give $800 max $900.(i dont need brand new gaming laptop, they are overpriced)