Will too low memory bandwidth affect my gpu performance?

Okay so i'm planning to buy a new laptop. I'm a casual gamer but i want games to run smoothly at least at medium settings. So i was looking at lenovo z51-70 it has r9 m375 gpu in it. Its better than gtx 850m in every aspect except memory bandwidth. Will it affect the gaming performance too much?

Vvv

Ram doesn't do **** to FPS in games its just for loading stuff so 1333mhz vs 1866 ram is noting for gaming you will physically see no difference all that matters is, is with stuff like rendering and photoshop and stuff

No manufacturers no what they are doing when they put ram into a system. Ram Speed has very little impact on performance and should be usually ignored