My laptop is a lenovo b570. I saw a Intel Centrino Advanced N 6205 wifi card for a price of $10. It seems to be a bit better than my broadcom 4313 that is a in there. The main benefit i see the dual band feature. After a bit more googling I found out my laptop wont just take any wifi card. I would need to put on a modded bios that had the wifi card whitelist removed. Worth the $10 and effort?