I was under the impression that USB 2.0 ports could only deliver information to the computer at speeds up to 60mbps, so surely the statement "up to 300mbps" is wrong? can anyone confirm that you can actually receive information over the wireless network at 300mbps? Surely not until USB 3.0 is released next year, with theoretical speeds up to 600mbps...
"How fast is USB 2.0? USB 2.0 has a raw data rate at 480Mbps, and it is rated 40 times faster than its predecessor interface, USB 1.1, which tops at 12Mbps. Originally, USB 2.0 was intended to go only as fast as 240Mbps, but in October 1999, USB 2.0 Promoter Group pumped up the speed to 480Mbps.
As far as we know, effective rate reaches at 40MBps or 320Mbps for bulk transfer on a USB 2.0 hard drive with no one else is sharing the bus."
i could be wrong but according to that usb2 would not provide a bottleneck for wireless n connection speeds of up to 300mbps. otherwise it would be kinda ridicolous for any company to sell a usb wireless n adapter and list it, as dlink do, to be able to connect at speeds of 30/60/90/120/180/240/270/300Mbps.
i just started running this dwa-140 adapter with a dir-655 router and connected in an upstairs room right on top of the router at 130mbps (in mixed network mode) with full signal. not tried WPA2 as recommended for good wireless speeds or put it in N only mode yet. seems good so far but i'm curious if 300mbps are possible by changing things about...
In real life tests with 'LAN Speed test' software our DWA-140 USB2 pre-n wireless adaptor (resting a few feet from the D-Link DIR-655 router with 100% signal) achieves an average of around 100 Mbps write and 60 Mbps read, when sending 10 to 100 test packets of files across the network to another PC's hard drive. So D-Links claim of "Up to 300Mbps raw data transfer rate" is predictably fiction, but the maximum real world transfer rate of 60 to 100 Mbps isn't bad at all, and is 3 to 5 times faster than our old wireless g router could muster.
In comparison the same PC's connected by 1.0 Gbps network cable through the DIR-655 router achieved 500 Mbps read and 540 Mbps write, so wired 1.0 Gbps networking is far faster if you can fit the network cables.
Our Dlink DIR-655 router has been beefed up with three new D-Link DWL-50AT 5dBi Gain Dipole Antenna repacing the smaller antenna supplied with the router, and these really help with signal strength (we paid about a tenner for each DWL-50AT hi-gain antenna).