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Just how fast is USB 3.0?

USB 3.0 boasts theoretical transfer rates of up to 4.8 Gbps, or 600 megabytes per second--10 times the maximum transfer rate of USB 2.0. This would, ideally, allow you to transfer a 25GB HD movie in about 40 seconds. Pretty fast, huh?

Unfortunately, the theoretical maximum is just that--theoretical. USB 2.0 devices rarely ever reached much more than 50% of the maximum transfer rate, and it's unlikely that USB 3.0 will either. A more realistic estimate, then, is that USB 3.0 will allow transfer at up to 300-400 megabytes per second. At that rate, it would take 60-80 seconds to transfer that same 25 GB HD movie from before.

 

USB 3.0 hardware is still in its infancy, of course, so even 300 MB/s sustained isn't attainable yet. So far, USB 3.0 transfers top out at around 200 MB/s when using a fast external SSD. Expect that to go up in the not-so-distant future, though.

 

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