in my company we have both latitude 3340 with wifi card ac 7260 and latitude 3350 with wifi ac 7265.
The 3340 wifi speed can go 40 Mbps in both download and upload while the 3350 goes maximum at 25 Mbps in download and 10 Mbps in upload.
I tried the speed test with both 2.4 and 5 ghz bands with multiple laptops.
Is it a know issue with wifi ac 7265 card ?
Tested with windows 10 and updated drivers