Is there a noticeable different between these two laptops? Which Should I buy if I'm interested in gaming?

First Laptop: http://www.currys.co.uk/gbuk/computing/laptops/laptops/lenovo-y50-15-6-gaming-laptop-black-10107245-pdt.html

(Noticeably cheaper)

Second Laptop:
http://www.currys.co.uk/gbuk/computing/laptops/laptops/lenovo-y50-15-6-laptop-black-10134821-pdt.html
(Noticeably more expensive but with what seems like little difference)

If I went for the cheaper one (provided that it came back in stock) how much performance would I be missing out on compared to it's more expensive counterpart?

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