That's a good question. When all this first started for me I actually thought the internal adapter on the slim was faulty. I started looking up replacement cards but never could figure out what brand they used.
UPDATE: According to Oppo, the Wifi dongle is an Atheros AR9271 unit. And according to this admittedly sparse Wiki page, so is the Xbox 360's: http://www.wikidevi.com/wiki/Microsoft_Xbox_360_Internal_Wireless_Module_(1399). However, according to a photo of the module in this teardown guide, it appears to be a Marvell unit (the model is too small to identify). Is it possible Microsoft is using two different Wifi chips, in which case this could account for some people not being affected by this? If anyone who actually owns an Xbox 360 with Wifi wants to help confirm, this teardown guide shows how to get to it, and it looks pretty easy: http://www.techrepublic.com/photos/...29&tag=thumbnail-view-selector;get-photo-roto. It'd be interesting if both someone affected by this issue and someone unaffected could open their Xboxes to see what Wifi chipsets their units have.
The Xbox 360 external adapter appears to be an AR7010+AR9280 unit, so this issue doesn't seem to affect all Atheros devices at least. Has anyone tested using the EXTERNAL Xbox 360 adapter on 2.4 GHz to see whether the difference in behavior between the two units is purely due to chipset or whether you also need to be on 5 GHz to get solid performance?
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