Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
Thanks a bunch, Your info helped a lot
"Paul" <nospam@needed.com> wrote in message
news:nospam-2012040942270001@192.168.1.177...
> In article <%bAxd.79$OA6.48408@newshog.newsread.com>, "Crhoff"
> <cr-nospam-hoff@bestnetpc.com> wrote:
>
> > I have a plain P4B motherboard. Does someone know the highest speed P-4
> > processor it will take.
> >
> > Thanks
>
> You can look it up here. It says P4 2.6GHz FSB400.
>
>
http://www.asus.com.tw/support/cpusupport/cpusupport.aspx
>
> If the board is overclockable on the FSB, you might also
> consider a FSB533 processor, but it could not be a Prescott
> or a Celeron D (90nm). The board is likely to work with
> Northwood processors (0.13u). I cannot find any good examples
> in Google, of someone doing this, and the only reason I
> suggest it, is to give your processor as much bandwidth
> as possible from the memory to the core. Above 1.8GHz, the
> processor would be pretty starved if it was using PC100
> memory, and some PC133 memory and a FSB533 bus would be the
> best conditions you could arrange for it. PC133 and FSB400
> would be second best, and PC100 plus FSB400 the lowest of
> the lot. (If running the bus at FSB533, the CPU clock is
> 133MHz, and the CPU/Memory divider in the BIOS should be
> set to 1:1, which is the lowest it will go. Thus, you need
> PC133 memory.)
>
> To see how the FSB can be pushed, start here:
>
>
http://www.cpudatabase.com/CPUdb
>
> Select P4 1.8A from the pulldown menu in the Intel section.
> There is an entry there, where a P4B motherboard is used
> to run a SL63X 1.8GHz FSB400 processor at 2.7GHz. That
> means the FSB is running at (2.7/1.8)*400 = FSB600 and
> implies to me that buying a FSB533 processor might work.
> You may have to set the clock manually, if the board
> doesn't do the right thing when the FSB533 processor is
> plugged in.
>
> You can look up SLxxx codes on processorfinder.intel.com
> to get details on processor models.
>
> In terms of the fastest processor you can buy, there is
> a P4 2.8GHz FSB400 processor for sale at Powerleap.com .
> They stockpiled some of them, for sale to owners of
> FSB400 boards. If you go this route, you are treating
> the busses conservatively, and will get the full 2.8GHz
> performance on CPU bound calculations. But if you were
> running Photoshop or other memory intensive program
> under those conditions, or perhaps using PC100 memory,
> don't expect to see that much of a difference from
> your current processor, as the processor will spend
> a lot of time "stalled" waiting for memory access to
> complete.
>
> In terms of why the Asus list may stop at a certain
> processor speed, the Vcore circuit will have some
> limit as to how much current it can source. You can
> guess at this limit, by looking up the fastest processor
> listed in the Asus list, and seeing the characteristics
> on the processorfinder site.
>
> This is a Powerleap 2.8GHz processor. 68.4W/~1.5V=45.6 amps
>
http://processorfinder.intel.com/scripts/details.asp?sSpec=SL7EY&ProcFam=483&PkgType=ALL&SysBusSpd=ALL&CorSpd=ALL
>
> This is Asus 2.6GHz processor. 62.6W/1.53V=40.9 amps
>
http://processorfinder.intel.com/scripts/details.asp?sSpec=SL6PP&ProcFam=483&PkgType=ALL&SysBusSpd=ALL&CorSpd=ALL
>
> By working out the current in amps for the various processors
> that are rated to work in the board, you'll get an idea
> of how far over or under spec your new processor would be.
> Unfortunately Asus does not list the max current figure used
> to design the Vcore circuit, so this is the only way I know
> of, to guess at the limit.
>
> If you don't want to do any research at all, stick with
> the 2.6GHz FSB400 processor, as listed on the Asus
> cpusupport page. Your choice.
>
> In terms of the "dip switch" settings offered in the manual,
> be careful not to select a setting that runs the PCI above
> 37.5MHz. For example, the 120/80/40 setting is not a good one,
> and could cause IDE disk corruption. Whether set with the dip
> switches or not, that setting would be a problem. Also, the
> multiplier section of the dip switch won't do anything,
> because the processors are multiplier locked. Only if somehow
> you got an Intel "Engineering Sample" ES processor, would you
> need to set a particular multiplier, so you can ignore the
> multiplier and focus on the processor clock choices.
>
> Good luck and good hunting,
> Paul
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