I have a Lenovo U41-70.
CPU: i5-5500U 2.4GHz (2 cores, 4 threads).
RAM: 2x4GB DDR3.
GPU: GT 920M 2GB.
Since I don't have enough money yet to build a PC and it will take me another year of saving money, I really want to use an EGPU instead. But how bad the bottleneck will be and will it worth...