Cacher is the code snippet organizer for pro developers

http://forum.thinkpads.com/viewtopic.php?t=112713

I do know that WWAN cards and mSata SSD's work in that slot.

As for wifi cards; if I remember right you need a modded BIOS are you need one of the whitelisted cards. Besides that I don't know if that slot will ever work with wifi cards.

But besides that: why would you want to run two wifi cards and how do you plan on getting any antennas overthere? Use the WWAN antennas?



https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/WWAN-antenna-useable-for-WLAN/td-p/371801

yes it will work, i have tested this in my X200. i have run two wifi cards in the machine, 5100 + 5300.

yes, but range will be smaller then with original antenas, because vwan antenna tuned for other frequency.

yes that is true the antenna is not designed for the WWAN frequency. 


http://www.jdhodges.com/blog/upgrade-x220-x230-thinkpad-wifi-antennas/

Upgrade X220/X230 wifi, WWAN blue/red cables usable?
Saturday, 2014.04.26	J.D. H.	Leave a comment	

If you are upgrading the wifi card on your Lenovo X220 or X230 ThinkPad, you may only have two antennas (black and white) pre-wired for wifi. If you have a wifi card with three antenna connectors, you may think you are out of luck :-(

Actually, if your X220 or X220 has an unused red & blue antenna connector (originally for WWAN cellular card) you can use one of those for your upgraded wifi card! :-)

Intel wifi card in Lenovo X220, before connecting blue antenna

Please note that the WWAN antenna is not perfectly sized/tuned for wifi frequencies BUT it seems to be close enough. I get significantly better signal strength with the three antennas (black, white, red) than I get with only two (black, white):
Full signal strength and 450Mbs using Intel Centrino Ultimate-N 6300 AGN on upgraded Lenovo X220.

Full signal strength and 450Mbs using Intel Centrino Ultimate-N 6300 AGN on upgraded Lenovo X220.