Good performance, no problems under Linux
I have been using this card for several weeks now, and the standard Linux kernel iwlwifi driver (with Ubuntu 16.04) is stable with no issues or quirks. Performance-wise, this card supports 802.11ac in 2x2 mode and sustains a connection to my WiFi access point at 520-866Mbps (the maximum that my AP supports) while in the same room, and 234-390 when in the farthest corner of my flat. I usually sustain 30-40MB/s transfers to/from a local NFS share, which is within range of expectations.
While this is no longer the newest in Intel's range, it is probably your best bet if you need a mini PCIe card as newer models are typically only found as NGFF cards.
I bought this to replace the full height mini PCIe card card in my Dell Vostro 1500. As this card is half-height, you will need to be aware that this product does not include an adaptor, but they are cheap and simple to fit.
If you are using this in a full height slot, you might also have insufficient slack in the existing antenna cables to reach the terminals of the new card. You can buy "pigtails" (not included in this product) to extend the existing cables, but you might also be able to tweak your cables to reach - check before buying.
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