Laptop review i7

Suppose so but the 840M is very low end, its not much better than integrated graphics. I would look for something with a better GPU. Also PC World are a rip off, try amazon.
 
The GT 840m is a mainstream / mid-range graphics chip. It is far better than any integrated graphics core. However, it will not perform as well as a higher end graphics chip. Typically most people would say that the GTX 850m is the lowest graphics chip that is considered a "gaming graphics chip".

The greater the resolution you want to play a game at, the more powerful graphics chip you will need. The GT 840m is capable of playing most current games on medium settings @ 1366x768. However, at 1080p resolution you are looking at low settings for most games except the ones with low graphic requirements.