In article <417310a3$0$30527$(E-Mail Removed)>, andreezer
<(E-Mail Removed)> wrote:
> I own an A7V266 with BIOS rev. 1011 and I'd like to install a XP-M 2600+
> (Barton core). I put the mobo in jumperfree mode and went to the BIOS
> setup to set the multiplier, but it only goes as high as 15x! where's
> the 16x multiplier?? there should be such a multiplier value because the
> highest clocked processor this motherboard supports is at 2133Mhz (2600+
> TBred).
>
> also, the XP-M Barton requires 1.45 Vcore, but this mobo only seems to
> support 1.65V minimum. I have the VID1-4 jumpers set to "CPU default".
> When I install the new CPU, will it run with 1.65V or not run at all
> (since the motherboard can't supply it with the 1.45V requested)?
>
> thanks in advance for any help.
Maybe you could select the multiplier you want in jumper mode ?
If you look at this page:
http://fab51.com/cpu/barton/athlon-e23.html
notice how the L3 bridge settings, seem to correspond to the CPU_Ratio
DSW on your motherboard. 8X is ON-OFF-ON-OFF-ON and
10X is ON-OFF-OFF-OFF-ON. The table for Barton shows C : C : C for 8X,
where C stands for closed (logic 0 or grounded) and : stands for open
circuit. The DSW, when ON, grounds the signal and makes a logic 0.
So, ON == C. You should be able to use the fab51 table, to figure
out a DSW setting for your processor. 16X is ::C:C or
OFF-OFF-ON-OFF-ON. All this assumes the the left most dip switch
actually drives the most significant multiplier bit, as failure
to drive it is a frequent reason for wrong multiplier values
showing up (i.e. being limited to just low range or high range
multipliers).
To experiment, set the clock to the lowest it will go, which is
100MHz. Then, experiment with the multiplier DSW, until you get
what you need. Once the multiplier has been verified with a Windows
utility (CPUZ), you can shut down and set the clock on the board to
133MHz, and run at the final desired frequency. (Reducing the clock
is a safety measure, in case an even higher multiplier is selected
by accident.)
THe fab51 page also documents what happens to voltage. The Mobile
chip will ask for 1.45V (but coded using a Mobile coding for VID),
and the fab51 page says a desktop board reads this code as 1.575V .
That is what mine read when plugged into a A7N8X-E. Either the BIOS
will leave the value alone, or, as you suggest, it'll get set to
what the BIOS considers a valid value. The 1.65V won't hurt anything,
and I've been testing mine with 1.65V or 1.7V. I find that if you
use too much voltage, it won't POST, even though the absolute max
is higher than that voltage.
I don't know whats up with the multipliers offered in the BIOS.
They don't seen to make a lot of sense, and perhaps the values
shown, have something to do with earlier model Athlon processors.
After all, the BIOS has to support different models of Athlon, and
maybe the BIOS is just confused.
HTH,
Paul
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