I NEED Asus pce n15 help?

This card is a wifi card. On my notebook I get speeds of 10-15 mbps but with ithis wifi card on my desktop I get speeds of only 1-1.5 mbps.
I have a an i7 3820 on a asus p9 x79 pro and 6gb of ram
thanks!!
Update: let me clarify, this card was only used on the desktop. I used the in built wireless chip on my laptop and i get much better speeds. I get ten percent speeds on my desktop than my laptop.
Update 2: The router is a belkin n600 db, and all it's firmware is up to date
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