I don't know whether that is an old card or not. I think the laptop was in the $300-$400 range when we got it. Inspiron 15-3551, came with Ubuntu pre-installed, which has since been swapped out for Debian.
This Dell support link [1] seems to confirm that it is 2.4Ghz only.
From lspci:
03:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)
I don't know whether that is an old card or not. I think the laptop was in the $300-$400 range when we got it. Inspiron 15-3551, came with Ubuntu pre-installed, which has since been swapped out for Debian.
This Dell support link [1] seems to confirm that it is 2.4Ghz only.
[1] https://www.dell.com/community/Networking-Internet-Bluetooth...