Hi, You don't "need" a new wifi card, and in fact I don't know that it would improve your speeds. So many things factor into speeds.   Interference is a big one, and the 5.0 ghz range doesn't have nearly the amount of other electronics that use that frequency so it may work out better for you.  Really hard to tell.  Depending on the cost, and the return policy of where you buy it ( :emotion-5:  ) you may want to try one. Todd
The laptop was purchased 8/2014.  I am having issues with my WIFI connection and had our cable service provider out today.  They isolated the issue to the laptop.  They proved this by running speed tests on various devices.  This laptop was the only device that produced such slow download speeds <6 Mbps while the other devices are running anywhere from 50 Mbps to as high as 90 Mbps.  If I connect this laptop via Ethernet it runs in the 90 Mbps range. The WIFI on this device is an Intel Wireless N 7260 and the driver version is 16.6.0.8 runs at 2.4GHz only. Does anyone know if this is defective (it passed all the tests) or is this something that needs to be upgraded already?  Is there an upgraded 
Inspiron Intel Wireless N 7260 with POOR performance