How can I tell if the wireless network card in my laptop supports 802.11n?

Solution 1:

Click on Start orb, and right click on Computer -> Device Manager. Search for Network adapters, and right click on your wireless adapter. Most probably, the name should indicate if Wireless n is supported, else right click on the adapter -> properties -> Wireless mode. If there is 'n' mode here, then Wireless n is supported.

Solution 2:

Try installing Speccy. It should tell you quite a lot about your network card under the Network section.

Even if your card doesn't support N, upgrading your router will still increase your bandwidth and range. That benefit is increased when both ends are N.