A7V8X and USB 2.0 ports

  • Thread starter Thread starter Lucius Snow
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Lucius Snow

Hello,

I own an A7V8X motherboard with a few USB peripherals plugged on it. All of
them are USB 1.1, they run correctly. I bought today a flash memory USB
(2.0). By seeing the transfer speed (around 1,3 MB/s), i noticed it ran in
USB 1.1. According the user's manual, the 4 USB ports of the motherboard are
2.0. Also, i don't need drivers for USB 2.0 since i'm running Windows XP.
All my system is up to date and stable. I looked in Sandra and it says that
the 4th USB controller only is USB 2.0. All the others are 1.1.

I wonder what's wrong ...
Any idea ? Thank you.
 
The motherboard USB 2 chipset needs a driver installed from your motherboard
installation CD, I believe.
 
"Lucius Snow" said:
Hello,

I own an A7V8X motherboard with a few USB peripherals plugged on it. All of
them are USB 1.1, they run correctly. I bought today a flash memory USB
(2.0). By seeing the transfer speed (around 1,3 MB/s), i noticed it ran in
USB 1.1. According the user's manual, the 4 USB ports of the motherboard are
2.0. Also, i don't need drivers for USB 2.0 since i'm running Windows XP.
All my system is up to date and stable. I looked in Sandra and it says that
the 4th USB controller only is USB 2.0. All the others are 1.1.

I wonder what's wrong ...
Any idea ? Thank you.
Click to expand...

http://www.usbman.com/Guides/checking_for_usb_2.htm

I presume Sandra is showing the run time binding of a USB2 logic
block to the port with the Flash Drive.

Note that, for USB 1.1 devices, while the theoretical transfer
rate is 1.5MB/sec (12Mb/sec), the practical rate is 1MB/sec or
so. This is due to protocol overhead, or at least that is what
I've read. Your 1.3MB/sec value suggests that maybe it _is_ running
in USB 2.0 mode.

When I look at this review, the best the five reviewed drives
can manage is 900KB/sec:

http://www.xbitlabs.com/articles/storage/print/usb-flash-roundup.html

I think the limit is due to the maximum transfer rate of the flash chip.

A datasheet for the NAND flash pictured in the review is here:
http://www.samsung.com/Products/Semiconductor/Flash/NAND/1Gbit/K9K1G08U0M/K9K1G08U0M.PDF

What is shows, is the NAND flash has a mixture of fast and slow aspects
to its operation. The fastest operations take 50ns each, implying since
it is a x8 device, those ops could do 20MB/sec. But the setup phases to
get ready for a transfer like that take longer. I don't understand
what I read in there well enough, to calculate what kind of rate to
expect. In any case, I would expect writing to take longer than reading,
as electrically eraseable devices take a while to erase a block or to
write a location.

Perhaps you can find a review for your flash drive, in order
to understand what read/write rates to expect ? I wouldn't
expect the manufacturer to tell you what to expect :-)

It is the same with USB scanners. Many proclaim their "USB2" capability,
when the scanner mechanism itself cannot even manage to produce data
at more than 1MB/sec - this makes the USB2 feature useless.

HTH,
Paul
 
DaveW said:
The motherboard USB 2 chipset needs a driver installed from your
motherboard installation CD, I believe.
Click to expand...

I think the drivers are for Windows 98 / ME only. Anyway i just checked the
into the device manager, and this is USB 2.0.
 
Paul said:
http://www.usbman.com/Guides/checking_for_usb_2.htm
Click to expand...

Okay. So yes, it's configured for USB 2.0. I have the "enhanced" mention.
I presume Sandra is showing the run time binding of a USB2 logic
block to the port with the Flash Drive.

Note that, for USB 1.1 devices, while the theoretical transfer
rate is 1.5MB/sec (12Mb/sec), the practical rate is 1MB/sec or
so. This is due to protocol overhead, or at least that is what
I've read. Your 1.3MB/sec value suggests that maybe it _is_ running
in USB 2.0 mode.
Click to expand...

I just did a few tests and my record is 1,4 MB/s. I'm a bit disapointed
though, i wish my flash driver was faster for USB 2.0.
When I look at this review, the best the five reviewed drives
can manage is 900KB/sec:

http://www.xbitlabs.com/articles/storage/print/usb-flash-roundup.html

I think the limit is due to the maximum transfer rate of the flash
chip.

A datasheet for the NAND flash pictured in the review is here:
http://www.samsung.com/Products/Semiconductor/Flash/NAND/1Gbit/K9K1G08U0M/K9K1G08U0M.PDF

What is shows, is the NAND flash has a mixture of fast and slow
aspects
to its operation. The fastest operations take 50ns each, implying
since
it is a x8 device, those ops could do 20MB/sec. But the setup phases
to
get ready for a transfer like that take longer. I don't understand
what I read in there well enough, to calculate what kind of rate to
expect. In any case, I would expect writing to take longer than
reading,
as electrically eraseable devices take a while to erase a block or to
write a location.

Perhaps you can find a review for your flash drive, in order
to understand what read/write rates to expect ? I wouldn't
expect the manufacturer to tell you what to expect :-)

It is the same with USB scanners. Many proclaim their "USB2"
capability,
when the scanner mechanism itself cannot even manage to produce data
at more than 1MB/sec - this makes the USB2 feature useless.

HTH,
Paul
Click to expand...

Thanks for all these informations ;). Cheers.
 
does the A7V8X-X allow use of ATHLON XP1600+ cpus

this is the cpu i have and the mobo that i want to get

Thanks

Dave b
 
does the A7V8X-X allow use of ATHLON XP1600+ cpus

this is the cpu i have and the mobo that i want to get

Thanks

Dave b
Click to expand...

Should be fine. I have one here running an Athlon 2200 chip.
 
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