Modifying laptop board to accept x16 pcie cards? any thoughts on this idea  


Active Member
Joined: 2 years ago
Posts: 12
January 25, 2018 11:54 pm  

As far as i know, for later laptop the best thing that can be done is combineing mini PCIe slot and express card slots for x2 speed. i havent found anybody doing this but aparetly there is P4EL or P4LC, i cant seem to find right model atm.
also there is exp gdc 9.0b that uses two hdmi cables from one m.2 slot for x4 pcie lanes.
All those connections go trought PCH chip and bring some lag into calculations. 

Is there a way to solder 16 pairs of wire to the board directly and other part of those wire would be PCIE socket that would house full size GPU. 
On every laptop motherboard that has GPU, or at least place for GPU, there are 16 small capacitors and 16 lanes that lead from CPU to GPU, those lines could be intercepted and lead to the external gpu. OFC this would be possible only by turning laptop into a desktop somewhat, because it wouldn't be really practical to carry additional wires that stick out of the laptop.
I am willing to buy a cheap board from ebay for about 20$ and try this out. im pretty handy with the soldering iron and i have everything that i need. Only thing that i font have and i cant seem to find is a proper scheme with pcie pin out diagram, also what other pins should be connected to pciexpress slot, like are there some identifying signals to identify device connected etc?
is there someone that has batter and deeper understanding on pcie physical layer to post down below some of the informations that would be of great help. Also i would use cheap and crappy gpu for the test before frying something worth


Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts

New Member
Joined: 5 months ago
Posts: 2
April 1, 2019 2:08 pm  


The post is quite old, but I plan on trying this with a Fujitsu AH532 motherboard(The one with unpopulated GPU). I am waiting for the ceramic caps to arrive, since the motherboard does not have them in place. For the beginning I want to simply solder wires of equal length to the TX,RX pairs as well as the additional signals needed. I will try to keep them as short as possible. One or two pairs should be enough to check if the setup is feasible. I have no idea if this setup would need additional tweaks(BIOS mod?) but since it's mostly a soldering job I will try it. If it works, then I might think of some custom PCB to connect to the GPU pads on the mobo and some sort of plug for the cable connecting the riser(I am currently running and eGPU setup with a cheap  riser with USB cable). I will keep you updated.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts