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Old September 24, 2010, 09:44 AM
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grinder grinder is offline
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to add to this, USB device performance generally scales with the performance of your CPU; therefore if your desktop is an old Celeron (for example) the PCI interface offered by an expansion card will inherently give you a performance boost. Couple this with the fact that you will get some antenna options with the card.

Another thing to consider when comparing the two is that a laptop may use a diversity antenna (left/right) for noise/signal-reflection cancellation. I would bet a USB stick wifi-adapter has a single antenna and lacks this feature.
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