I’ve swapped WiFi cards on multiple Dell systems and have never had an issue. Unlike some other vendors, Dell doesn’t restrict systems to certain WiFi cards. The DW1704 is a dual antenna, mPCIe half-height card, so I’d recommend the Intel Wireless-AC 7260HMW as a replacement. It’s the best mPCIe WiFi card that was made before everything switched to the newer M.2/NGFF connector type. Make sure you get the HMW model, not the NGW model, and also make sure you get the Wireless-AC model, since there’s also a Wireless-N 7260HMW that only supports 802.11n rather than 802.11ac. I don’t know why Intel used the same model code for two different cards with very different capabilities, but they did, so be careful.
