eGPU vs PC
Hello. I have a Fujitsu AH531 with i7 2640m (upgraded from pentium b960), 6GB RAM and no dGPU. I want to buy an eGPU (Gigabyte Geforce GTX 1060 6GB Arous, EXP GDC Beast V8.0, Antec VP 500W), but some guys tell me, I should buy a PC (I picked i3 8100, Gigabyte GTX 1050ti, 8GB RAM). My budget is 2500PLN (~710USD). I wanted to place in my laptop at least 2630QM, but some guy says it isn't problem with the cooling, but the power section (it's probably designed for 35W, not 45W). I also saw, if I place quad-core, I would have to modify heatsink. I also have this idea: first buy eGPU, then PC, but use GPU and PSU from eGPU. So, can anyone tell me which option is the best (sorry for bad english)?
PC is better by the pci express lane be x16 and haven't limited rate of transfer and bandwidth.
US$6 mPCIe eGPU adapter might be worth testing with desktop PSU & video card to see if you are happy with eGPU performance:
Otherwise an inexpensive desktop system has a load more bandwidth and eliminates x1 narrow link performance hiccups.
What about PC and adapter? If I want to play in my house I will use PC, but if I going to my friend, I unmount GPU and PSU from PC and take the adapter with laptop. There don't be a problem with taking everything with me, because I'm using backpack to take laptop and it have a lot of free space.
CPU is not a concern for gaming. i7 2640m is perfectly enough. You won't see any gaming performance improvement by upgrading to 2630QM, but power issues are possible: the laptop's PSU will get extremally hot and it's neither stable nor safe solution.
Your concern is PCI x1 adapters such as EXP GDC v8 and other mentioned by nando4. You will see huge GPU performance drop using these adapters and you don't want your high-end GPU such as GTX1050 or GTX1060 performing like GTX670. I guarantee you won't be satisfied with these adapters. I wasn't.
Spending additional money both for a PC and a laptop is the worst solution I can imagine. I see you need fully mobile solution, but you want to re-use PC's PSU for laptop's eGPU ? Imagine dissasembling the PC, disconnecting all PSU cables from the mainboard and connecting to the adapter. It take hours to dissasemble the PC and assemble the eGPU with your laptop. Instead of playing you will spend time assembling and disassembling your hardware eventually destroying your PC or the laptop/GPU.
All your needs and requirements will be met with NUC + EXP GDC v9. See this thread started by Stu: https://egpu.io/forums/expresscard-mpcie-m-2-adapters/exp-gdc-beast-v9-0b-just-arrived/
I use cheapest Intel NUC with i3-6100U and GTX 1060, Dell DA-2 PSU for the Beast and the same metal casing. It works like a full PC and it's fully mobile as you need literally 4 connectors to plug/unplug and you have everything set up within 10 minutes. Just keep in mind to plug power connectors last if you don't want the setup to burn ...
I was lucky to buy my NUC together with small SSD and 4GB RAM for 300$, GTX1060 for 200$, Exp Gdc v9 for 110$, Dell PSU for 10$. So it definetely fits your budgets. And it's the setup I recommend, it's the setup you'll be more than happy with.