Hello folks. I have Dell XPS 15z l511z and I wanted to upgrade my CPU i5 2410m but soon I discovered that I couldnt do that because my CPU is BGA. Then I saw on Ebay motherboard from same laptop but with i7 2640m. So I was wondering if I could replace my old motherboard with the motherboard with better CPU and does that laptop have 16x PCI e slot because I want external gpu. Thanks a lot
You can see if there is a free mini PCIe slot by looking at the motherboard. If it's the same model laptop and the motherboard looks to be the same, there is a chance it will work. Not guaranteed but if you really want to upgrade, try it and see what happens. I would not bother with an external GPU for it since it will run at PCIe 1x speeds and generally the pain of having a cable sticking out of the system, along with a power supply and monitor for the card is not worth it.