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mPCIe Extender and Gen2 Signaling  


Eminent Member
Joined: 3 years ago

Anyone using mpcie extender (such as the P22S-P22F) in here? If so, are you able to maintain a stable gen2 signaling without any error?

I'm asking because I'm planning to keep my next setup as simple as possible, and having a small diy mPCIe port out side the case can provide much convenient and portability. I would either get the P22S-P22F or this (since its is soldered - which theoretically should provided better stability), but honestly I have no idea.

Thanks for reading.

2012 15" ASUS K55VJ (GT635M) [3rd,2C,M] + GTX 1050 Ti @ 4Gbps-mPCIe2 (EXP GDC 8.4) + Win10 [build link]  

Estimable Member
Joined: 3 years ago

I've read in another forum that guy was using i guess some old model similar to PE4C kind (he posted pictures) and the cable from the mPCI adapter to the actual board where the VGA is was the same flexible cable like the one on P22S-P22F (much longer though).From what i remember he was complaining a lot from it and i think he end up changing it.So i guess it's not very reliable,i wouldn't personally risk it  but i like your thinking.

ASUS A53SV: i7-2860QM, 16GB DDR3 running WINDOWS 10 Enterprise LTSB 2016
eGPU: EVGA GTX 1080 FTW+ PE4C V3.0(mPCIe)+EVGA 650 G3 PSU (internal display ONLY)

Noble Member Admin
Joined: 3 years ago

For sure your proposed solutions will work at Gen1 link speed. It's Gen2 that gets tricky. Required there is precise impedance matching with fewest number of connectors and a short cable to minimize signal interference and loss.

Your notebook too requires good signalling to the mPCIe slot too. It itself may never been tested for Gen2 compliance with say a wifi card. Often those slots  being set to Gen1 speed by the BIOS.

My experience being the soldered cable PE4L 2.1b and PE4C 3.0 outperformed socketted eGPU adapters like EXP GDC. As too did mPCIe slot over expresscard, the latter often being a socketted cage that sits on a systemboard so being two connector hops to an eGPU adapter from the Southbridge PCIe port.

In all, your testing being the only way to verify Gen2 link capability.

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M2 (ADT-Link R43SG) + Win10 1803 [build link]