I'm going to buy MSI GP60 2PE (Leopard) will it work well with unreal engine ? ?

MSI GP60 2PE (Leopard) have:
Intel Core i5 - 2.9 - 3.5 GHz
RAM - 8GB(I will upgrade to 16GB)
Nvidia GeForce GT840M - 2GB

with this spec I will be able us unreal engine efficiency ?

The GPU is just OK, not great. If you have extra money, see if it’s possible to upgrade the GPU. It’s better than the integrated Intel graphics processor, but not by all that much.

Thank you for your reply

Which one is better NVIDIA GeForce GTX 850M -2GB with Intel Core i5-4210H 2.9 - 3.5 GHz
OR
nVIDIA GeForce 840M -4GB with Intel Core i7-4510U 2.0 - 3.1 GHz
which one is better combo ?

nVIDIA GeForce 840M -4GB with Intel Core i7-4510U 2.0 - 3.1 GHz - that one… even though the graphics are “lower” the CPU speed is a lot higher and a lot newer… UE4 uses more CPU than Graphics…

umm, you might want to check your numbers as the I5 is faster newer and more powerful then the I7, sources:CPU Boss, Game-Debate

Ue4 is quite graphics hungry and the 850 will probably have significant boost in performance over the 840

I would say this one:)