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Without the correct driver, your Wi-Fi adapter will either:
Many users install the driver but only get 54 Mbps. To unlock 802.11n speeds on the AR9285 under Windows 7 64-bit: atheros ar9285 driver windows 7 64 bit
If all else fails, replace the AR9285 card with an (backward compatible with PCIe half-mini) – Windows 7 64-bit has native drivers for it, and you’ll get dual-band 802.11ac. Without the correct driver, your Wi-Fi adapter will