Ok then can u suggest which gpu to use to have less bottleneck. Also the pcie port is mini pcie the standard wifi port. Its like this laptop has an wifi expansion slot that pcie only.Yeah you're going to get a bottleneck, biggest bottleneck will be the GPU dock itself, the PCI-E cord is so long that it is a main bottleneck. Nothing you can do about that when it comes to all GPU docks.
but you might still get a bottleneck from the CPU too, so I'd say you'll loose around 40% GPU performance at most.
Oh yeah i wont be playing AAA titles i mean i will only play games which were released till 2014 max. Will that be fine?a GTX580 uses twice the power of the GTX1050 (300 watts vs. 150), and gives 10-20% lower frame rates; with slower mobile processors of 9 years ago, I imagine things only go downhill further quickly, unless only playing games from 8-10 years ago...
Cant afford pc right now thats why i was asking about gpu which wont bottleneck much playing games of 10 years old at least till 2013 games.Why not assemble a desktop PC? There's no convenience in using a laptop with an external graphics card. Desktop-level I3 with similar performance costs only $10, and I recently assembled a computer for only $30.
So you have to use external graphics cards, the more high-end graphics cards lose performance.
GTX660 760 950 960 i's not expensive now.