¿Tengo wifi 802.11n o 802.11b?

Hola, hace una semana compré el AIO C560. En las especificaciones indica:
Tipo de Wireless LAN: 802.11b, 802.11g, 802.11n
Pero el problema está en que en las propiedades del equipo no me aparece 802.11n Preamble sino 802.11b Preamble.
Tengo 200 megas de jazztel (fibra optica) y el pc está a 20 metros del router con 2 paredes por medio. Me marca 10 megas y descargando lo hace a 800kb/s.
¿Sabeis por qué me aparece 802.11b en lugar de 802.11n? ¿Si apareciese la "n" tendría más velocidad, o por lo menos más alcance (2 barritas de 5).
Os adjunto una imagen: http://www.subeimagenes.com/img/lenovo-c560-1126859.html
Gracias

I think I found my answer here:
http://support.apple.com/kb/HT4199
Apple is still beyond this tech!
Routers that support 802.11n should be configured for 802.11a/n mode for maximum speed and compatibility. Routers that only support 802.11a can be left in 802.11a mode. Different Wi-Fi routers support different radio modes, so the exact setting will vary depending on the Wi-Fi router in use. In general, enable support for all modes. Devices will then automatically select the fastest commonly supported mode to communicate. Note that choosing a subset of the available modes will prevent older devices from connecting (for example, 802.11a devices will be unable to connect to a Wi-Fi router in 802.11n-only mode). In addition, choosing a subset of the available modes may cause interference with nearby legacy networks, and may cause nearby legacy devices to interfere with your network.

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