P4P800-E Dlx -- 32Bit data transfer y/n?

I wonder why Asus defaulted this BIOS setting to NO--OR if DMA is used, does
it matter??

MikeSp
--------------------------------
"Egil Solberg" <egilso.TakeThisOut@hotmail.com> wrote in message
news:2pc7rpFjfonaU1@uni-berlin.de...
 > John Blaustein wrote:
  >> P4P800-E Deluxe, P4/3.0c, 2GB RAM, WD SATA HD (C, WD IDE HD (D,
  >> XP Home.
  >> I see that the default BIOS setting for 32Bit data transfer (Main>IDE
  >> setup) is "disabled." I'm curious why one would not use 32Bit data
  >> transfer. I've tried both settings and the system works in both
  >> modes. Wouldn't data transfer be faster with 32Bit enabled?
 >
 > 32bit is more efficient, but since all in all physical disc
 > reading/writing is the current limitation, your computing experience will
 > not be changed by changing this, just as you describe. Leave at 32 bit.
 >
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 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: P4P800-E Dlx -- 32Bit data transfer y/n? 

Yes. Info from ARP

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32-bit Transfer Mode
Quick Review

This BIOS feature allows you to command the IDE controller to combine two
16-bit hard disk reads into a single 32-bit data transfer to the processor.
This greatly improves the performance of the IDE controller as well as the
PCI bus.

Therefore, it is highly advisable to enable 32-bit Transfer Mode. If you
disable it, data transfers from the IDE controller to the processor will
only occur in 16-bits chunks.



"John Blaustein" <nomail RemoveThis @nomail.com> wrote in message
news:t5qdnVCnL4olMa3cRVn-iw@lmi.net...
 > P4P800-E Deluxe, P4/3.0c, 2GB RAM, WD SATA HD (C, WD IDE HD (D, XP
 > Home.
 >
 > I see that the default BIOS setting for 32Bit data transfer (Main>IDE
 > setup) is "disabled." I'm curious why one would not use 32Bit data
 > transfer. I've tried both settings and the system works in both modes.
 > Wouldn't data transfer be faster with 32Bit enabled?
 >
 > John
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: P4P800-E Dlx -- 32Bit data transfer y/n? 

Michael S. wrote:
 > I wonder why Asus defaulted this BIOS setting to NO--OR if DMA is
 > used, does it matter??

I don't think DMA or not should matter, but it will probably free up some
space on the bus enabling 32bit transfers. Practical when the bus is already
loaded, which happens not regularly.<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: P4P800-E Dlx -- 32Bit data transfer y/n? 

"John Blaustein" <nomail.DeleteThis@nomail.com> wrote in message
news:t5qdnVCnL4olMa3cRVn-iw@lmi.net...
 > P4P800-E Deluxe, P4/3.0c, 2GB RAM, WD SATA HD (C, WD IDE HD (D, XP
Home.
 >
 > I see that the default BIOS setting for 32Bit data transfer (Main>IDE
setup)
 > is "disabled." I'm curious why one would not use 32Bit data transfer.
I've
 > tried both settings and the system works in both modes. Wouldn't data
 > transfer be faster with 32Bit enabled?
 >
 > John
The setting only affects operation during the very first stage of boot,
when the BIOS i still controlling the disk drive. Once XP is loaded, a
full '32bit' driver takes over. The 32bit designation in this case,
doesn't have any effect on the speed that data is actually transferred,
but the 'memory map' used for the transfers. A '32bit' driver, can
transfer the data anywhere into the memory space addressed by a 32bit
address (4GB). The 16bit driver, is limited to doing the transfer into the
low memory area, and if data needs to go to a higher part of memory, then
performing a second memory-memory transfer to complete the transaction.
The boot section of W2K/XP, largely only transfers data into the lower
area of memory anyway, till it's own IDE driver is loaded. Hence the
little/no change in speed that is seen.

Best Wishes<!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: P4P800-E Dlx -- 32Bit data transfer y/n? 

Roger,

Thank you.

John



"Roger Hamlett" <rogerspamignored DeleteThis @ttelmah.demon.co.uk> wrote in message
news:T%%Zc.1198$kV2.1181@newsfe4-gui.ntli.net...
 >
 > "John Blaustein" <nomail DeleteThis @nomail.com> wrote in message
 > news:t5qdnVCnL4olMa3cRVn-iw@lmi.net...
  >> P4P800-E Deluxe, P4/3.0c, 2GB RAM, WD SATA HD (C, WD IDE HD (D, XP
 > Home.
  >>
  >> I see that the default BIOS setting for 32Bit data transfer (Main>IDE
 > setup)
  >> is "disabled." I'm curious why one would not use 32Bit data transfer.
 > I've
  >> tried both settings and the system works in both modes. Wouldn't data
  >> transfer be faster with 32Bit enabled?
  >>
  >> John
 > The setting only affects operation during the very first stage of boot,
 > when the BIOS i still controlling the disk drive. Once XP is loaded, a
 > full '32bit' driver takes over. The 32bit designation in this case,
 > doesn't have any effect on the speed that data is actually transferred,
 > but the 'memory map' used for the transfers. A '32bit' driver, can
 > transfer the data anywhere into the memory space addressed by a 32bit
 > address (4GB). The 16bit driver, is limited to doing the transfer into the
 > low memory area, and if data needs to go to a higher part of memory, then
 > performing a second memory-memory transfer to complete the transaction.
 > The boot section of W2K/XP, largely only transfers data into the lower
 > area of memory anyway, till it's own IDE driver is loaded. Hence the
 > little/no change in speed that is seen.
 >
 > Best Wishes
 >
 ><!-- ~MESSAGE_AFTER~ -->
 >> Stay informed about: P4P800-E Dlx -- 32Bit data transfer y/n?