Which one? Nvidia 920m 2gb or Nvidia 840m 2gb

[one-nic-knobe]

I'm looking to buy a laptop (Hp, dell Inspiron and Asuspro) All have the same processor ( i7-5500u), the same amount of ram (8gb) and the same screen resolution (1366 x 768) so the only real factor is the graphics card, so which should I get? 840 2gb or 920 2gb?

 

[jaguarskx]

The 840m is definitely more powerful than the 920m. The 840m is probably about 10% less powerful than the 940m.