I designed a mPCIe to M.2 adapter specifically for the XTRX. It has support for the second PCIe lane, so you can get full data rate out of / into the radio.
Available here: XTRX Adapter
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This is very interesting, thanks for sharing!
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Is this M.2 M-Key?
Yes, it is M-key. I updated the sales page to clarify, thanks for pointing out the omission
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This is just in time 
When we receive these adapters, I’ll write a feedback here. x2 lane!
@ricardas do you think with 2 PCI lanes XTRX can handle announced 2 x 90 MS/s in MIMO mode?
Great! I haven’t gotten a review from anybody yet, looking forward to it.
As far as I know, the current limit of 61.44Msps MIMO is dictated by FPGA gateware, something to do with how the digital interface between FPGA and the LMS7002M chip is being clocked. I don’t know the details.
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Thank you for the details. It’s pity 