Question about Wireless N capabilities of my uMB

hi guys. have late 2008 unibody macbook. bought medialink mwn-wapr150n wireless n router other day replace dying linksys router. works great, except os x showing it's connected router on g speeds:



on router settings, have set mixed b/g/n mode. computer shows supports n, it's connected g. have idea what's wrong?

router's settings:

 

try creating dedicated 802.11n network , see happens.

 

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