Easy question....how many USB ports are on some of the newer motherboards?
Six on the back....plus more on headers?

What about SATA ports, have they gone much beyond four?

-John O

JohnO wrote:
You can use the "advanced search" on the Newegg motherboard page to
get this information.

Intel motherboards:

For SATA, 4+4 or 6+2 might be max (Southbridge plus a separate
controller). Intel Southbridges have six SATA. For USB, I see one
with 8 ports on the back.

AMD motherboards:

For AMD motherboards, 6 USB on the back looks like the limit.
And perhaps 6 SATA.

HTH,
Paul

"Paul" <nospam@needed.com> wrote in message news:g01r6n$3ja$1@aioe.org...
Aha, a new resource. Thanks!

On Fri, 9 May 2008 10:35:13 -0400, "JohnO"
<johno@!NOOSPAM!heathkit.com> wrote:


Ask elsewhere

"OldDuke" <none@nobody.net> wrote in message
news:b6hc24hbtjdpoaiuh43de930g20nj2bq5i@4ax.com...
How many USB ports does Win XP/Vista support? Not devices (127) but ports.
And, can I add 127 devices to each port within Win XP?

-John O

JohnO wrote:
My god man, what are you running? A factory?

"Big Al" <BigAl@nowhere.com> wrote in message
news:coEVj.3530$5b3.2658@trnddc05...
LOL, no. It's just a point of interest. It all gets back to the 'hub' and
'root hub' stuff that I can't wrap my brain around.

-John O

"JohnO" <johno@!NOOSPAM!heathkit.com> wrote in message
news:%23r%23tft3sIHA.3780@TK2MSFTNGP03.phx.gbl...

USB supports up to 127 peripheral devices which can be connected with USB
hubs to expand the number of connectors. The hubs can be connected more or
less in any configuration that you please, but the hub tree must be
dendritic* and there can be no more than 15 hubs between the host and any
peripheral.

*The A and B connector configuration forces this topology.

Thanks, I found some collaborating info at usbmadesimple.co.uk.

Can I do the 127-thing on *each* of my two physical laptop USB ports, and
each of the six ports on the rear of my desktop mobo? Or, is there just one
root hub in there being split into several physical ports by an internal
hub...using up one of my allowed hubs in the dendritic chain? This kind of
thing is hard to google.

And yes, the question is academic, but only partially. I'm writing a
tutorial and hands-on lab, the end-user will connect a few devices and we'll
use Microsoft's UVCView USB utility to examine the ports and devices and the
power they're claiming. The theory says "127", but the practical application
is fuzzy and I don't see anyone explaining it.

(reminds me of the commonly quoted file name size limit: 254/255...everyone
quoted the MS-provided number, but nobody bothered to try it. I did, and the
results were different than what MS implied. Today most of us know that
"C:\" and takes away three of that 254...)

-John O

"JohnO" <johno@!NOOSPAM!heathkit.com> wrote in message
news:uiGhRSdtIHA.672@TK2MSFTNGP02.phx.gbl...
<answering my own question...>

Per wiki: "USB host may have multiple host controllers and each host
controller may provide one or more USB ports. Up to 127 devices, including
the hub devices, may be connected to a single host controller."

So, my Intel mobo could handle 889 devices.

<wondering how to get the purchase order approved to test this>

-John O

JohnO wrote:

I think you will be having "severe propagation and timing issues" a long
time before you get to 127 devices. Much less stacking the wiring and
hubs to accomodate nearly 900 USB items. ;-)

"Bob I" <birelan@yahoo.com> wrote in message
news:eDaU54dtIHA.524@TK2MSFTNGP05.phx.gbl...
You're not helping the cause, Bob, even though you're certainly right. :-)
I remember reading about someone building a 127-device system back when USB
was new, it was mostly keyboards and mice and hubs, and a stunt at a Comdex
or something.

-John O

JohnO wrote:

http://www.zisman.ca/Articles/1999/USB.html