Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
In article <ae23184c.0411160455.53ebc652@posting.google.com>,
jan@klaverstijn.nl (Jan klaverstijn) wrote:
> nospam@needed.com (Paul) wrote in message
news:<nospam-1511042235390001@192.168.1.177>...
> > In article <419946d6$0$30610$abc4f4c3@news.euronet.nl>, "Jan Klaverstijn"
> > <jan@klaverstijn.nl> wrote:
> >
> > > Hi all,
> > >
> > > I just installed a new CPU in my Asus A7V400-MX. It was sold as an AMD
> > > Sempron 2200+. In order to get it recognized I flashed the latest BIOS
> > > version 1004 . However, it still tells me it sees a 900MHz cpu. I
reset the
> > > default settings after flashing to no avail. Can I cure this or am I
simply
> > > cheated when bying the cpu? I run Linux on that box. This is the
content of
> > > /proc/cpuinfo:
> > >
> > > processor : 0
> > > vendor_id : AuthenticAMD
> > > cpu family : 6
> > > model : 8
> > > model name : AMD Athlon(tm)
> > > stepping : 1
> > > cpu MHz : 899.977
> > > cache size : 256 KB
> > > fdiv_bug : no
> > > hlt_bug : no
> > > f00f_bug : no
> > > coma_bug : no
> > > fpu : yes
> > > fpu_exception : yes
> > > cpuid level : 1
> > > wp : yes
> > > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
pge mca
> > > cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
> > > bogomips : 1795.68
> > >
> > >
> > > I need the additional performance badly. Please help.
> > >
> > > Kind regards,
> > > - Jan.
> >
> > According to this, it is supposed to read 1.8GHz.
> >
http://www.tomshardware.com/cpu/20040728/sempron-01.html
> >
> > With an FSB of 266, the clock should be 133. 1800MHz divided
> > by 133MHz gives a multiplier of 13.5 .
> >
> > Have a look in the downloadable manual, as the paper manual in
> > the motherboard box has at least one error when it comes to
> > the DSW setting.
> >
> >
http://www.asus.com.tw/pub/ASUS/mb/socka/km400a/a7v400-mx/e1817_a7v400-mx.pdf
> >
> > Make sure the DSW is set for 133MHz CPU clock, as that should
> > cause the FSB to run at 266, and give you a core of 1.8GHz. Since
> > not all the DSW settings are documented, maybe you've discovered
> > a way to get a 66MHz clock fed to the processor ? Since nobody has
> > read the numbers off the top of the clockgen chip on that board, I
> > cannot look up what the other dip switch settings would do.
> >
> > HTH,
> > Paul
> >
> >
> > HTH,
> > Paul
>
> Thanks for your input; it will certainly set me on the right track.
>
> What I get from this is: I need to set the switch to a higher FSB. In
> fact the Sempron has a 333MHz fsb. This suggests I set the switch to
> 166.67Mhz. This makes perfect sense as 166/100*900=1500, 900 being the
> current reading for processor speed and knowing that a 2200+ is in
> fact a 1500MHz. Bummer I missed the DSW; my "other motherboard" has no
> switches or jumpers so I just didn't look. I will do this tonight
> (currently I am in the office) but am confident this will make all the
> difference. One tinge of doubt comes from the remark in the doc that
> changing the switch settings does not make sense when the chip is
> locked. What's the story here?
>
> Thanks again,
> Jan.
Locking refers to the multiplier. The processor chip takes the
external clock and multiplies it by a constant that is fixed
during manufacturing.
The DSW switches control the clockgen. They modify the external
clock, and the processor has no influence over that clock signal.
Thus, the clockgen is changable via the DSW.
Overclocking can be done by either changing the external
processor clock or by changing the multiplier. AMD has been
shipping multiplier locked processors for some time, leaving
the external clock generator as the only way to modify them.
So, the DSW can be used for adjusting the processor to run at
nominal conditions, or to overclock the processor. When using
the external clock in this fashion, you may need faster memory,
or the Northbridge itself may become the limiting factor in
how fast the system runs. In addition, on some single channel
motherboards, as you raise the memory clock, you cannot run a
full set of DIMM modules, and have to reduce the number of
DIMMs used. That means external clock modifying has its limits,
and they may be related more to Northbridge or the memory bus
than to the processor itself.
HTH,
Paul
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