Raspberry Pi Forums

The Pi has two USB ports. They are 2.0 HS ports. My Question is: does the 480Mbs bandwidth apply for both ports together, or for each port individually?

Its one port split into 2 (or 4 on a B+) so its a total. I wouldn't expect anywhere close to the theoretical 480 Mb/s either.......

If you use the ethernet, that counts as well.

In fact, the 9512 is a 3 port hub and the 9514 is a 5 port hub.

Aside: In an x86 laptop or desktop, does each USB port that is exposed on the case get its own 480 Mb/s allotment, or are they allowed to be chained together (like they are on the Pi) as well?

Joe Schmoe wrote: Aside: In an x86 laptop or desktop, does each USB port that is exposed on the case get its own 480 Mb/s allotment, or are they allowed to be chained together (like they are on the Pi) as well?

First step would be to cehck how they're wired to the motherboard. Do they use one hearder row or two? (It's usually two.) From there, you'd have to check the m/b schematics to see how the header is connected to the southbridge, and then check the specs on the southbridge.

At leat on the Pi we know where the real root of the USB network is and what it is capable of...even if the best description of that is "not much".

At leat on the Pi we know where the real root of the USB network is and what it is capable of...even if the best description of that is "not much".

Heh heh…

W. H. Heydt wrote:

Joe Schmoe wrote: Aside: In an x86 laptop or desktop, does each USB port that is exposed on the case get its own 480 Mb/s allotment, or are they allowed to be chained together (like they are on the Pi) as well?

First step would be to cehck how they're wired to the motherboard. Do they use one hearder row or two? (It's usually two.) From there, you'd have to check the m/b schematics to see how the header is connected to the southbridge, and then check the specs on the southbridge.

At leat on the Pi we know where the real root of the USB network is and what it is capable of...even if the best description of that is "not much".

I raise your "not much " with a "usually enough"