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TP-LINK TL-WDN4800 N900 slower than in Windows 7

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I have Speedtest.net Mini running in my local network. I find that the download speed of TP-LINK TL-WDN4800 N900 in OS X 10.8.2 is significantly lower than in Windows 7. In OS X, I get about 30 Mbps compared to 60+ Mbps in Windows. The upload speeds are, however, very comparable. This is the same machine dual-booting into two OS's.

 

Are there any tips on how to tweak/troubleshoot this card in OS X? It's always been advertised as plug 'n play but how do I know if I have the best driver for it? Please advise.

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