Max vcore for Winchester

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I've got a Winchester [3000] at 250 FSB and 1.6v.  It's been there a month.

I'm wondering how 'dangerous' 1.6v is.  Without any guarantee, would it seem
safe to increase from 1.6v?

Thanks



Re: Max vcore for Winchester



fj wrote:
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What are your idle and load temperatures?  Cooling setup? Heat will
usually kill a cpu before voltage.  Without more info its hard to give
decent advice.

-Dylan C

Re: Max vcore for Winchester




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Right.  Temp under Prime 95 is 50C.  Should have mentioned.  Idle is high
30's.
Clearly I've got room to go on the temp - so I could go to 1.7 vcore without
thinking it would probably break the cpu?

Thanks



Re: Max vcore for Winchester



fj wrote:
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Increments are best, just bump it up one notch at a time until you
either hit your clock speed goal or the temps get higher than you are
comftable with.  It looks like the upper limit of the CPU is 70C, but I
would keep it around 55, maybe 60, fully loaded.  I don't have a CPU of
this style, so you might want to get temp numbers from someone who is
morefamiliar with winchester cpus.

-Dylan C

Re: Max vcore for Winchester




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Thanks.

On the max temp, is the CPU temp as reported in MBM or in BIOS the case temp
or the die temp?  I thought it was the die temp.  If so, the max temp is
90C, yes?
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Re: Max vcore for Winchester



fj wrote:
  Thanks.
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I know the old Thunderbirds went crispy at 90C.  I'm pretty sure that
todays CPUs are lower power and therefore lower temp, but once again, I
use a different model.  I'd say to be safe, die temp should not exceed 60C.

-Dylan

Re: Max vcore for Winchester




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It would be better to go to lower than those temps in anticipation of a hot
day.

FYI My 3200+ at 2.4 gigs 1.45 volts (240 fsb, 10x) runs at 28C idle as
CrystalCPUID has it down to 1.2 gigs and 1.2 volts -- I won't elaborate with
all the details, but I start off at 8x and volts = auto (=stock 1.4v)
because if I change the volts from auto Crystal can't change the voltage any
more, and at 10x the volts wouldn't be enough to avoid errors booting. When
doing 3D it can close in on 50C, due to the gpu heat in there. prime95 gets
to about 45C, but less on a cold day.

I stopped at that speed and voltage because 1.45 v is as high as
CrystalCPUID can take it, so if I want to go higher I'll have to give up the
power now auto-underclocking by setting the voltage in the BIOS. It gets
hotter than I would like if I go up to 2.6 -- takes maybe 1.55 volts, can't
remember.

It's perfect for my pc3200 ram, though, because set to 166 it comes back up
to 200.

Try Googling up Divider Helper and download that. It's a little computator
of memory and cpu speed from clock speed, cpu multiplier, and memory
divider.

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Re: Max vcore for Winchester





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I meant I'd have to give up the undervolting. Crystal would still underclock
ok.


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Re: Max vcore for Winchester



fj wrote:
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Just found this site....plug in your CPU info and it will show you the
max CPU temp.

http://www.amdcompare.com/us-en/desktop /

-Dylan C

Re: Max vcore for Winchester A64MaxTemp



Try the utility A64Maxtemp.  It will read the max case temp (max temp for
your CPU in your case) right off your CPU.  There is a link for it in this
forum; http://www.planetamd64.com/index.php?showtopic=19909

Best wishes,

Pete

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Re: Max vcore for Winchester A64MaxTemp




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Thanks.  But, is the CPU sensor sensing case or die temp?  I thought it was
sensing die temp for the CPU.
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Re: Max vcore for Winchester A64MaxTemp



It is sensing the die chip.  The case temp is the rated die temp for the CPU
in a case.  Hope that makes sense, don't know what AMD was thinking.

Best wishes,

pete


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Re: Max vcore for Winchester A64MaxTemp




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The official information for Athlon64 is here. Absolute max is listed
as 1.65V for Vcore. Vdimm max (VDDIO) is 2.9V. You'll have to consult
some of the private forums, to judge whether operation at extended
voltages is impacting the life of the devices.

http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/31411.pdf

The case temperature is a traditional thermal specification for
electronic parts. If you are testing heat sinks, it is pretty easy to
mill a groove for a thermal sensor, into a heatsink, and measure
the temperature right at the top of the case. It would be easy to
fit commercial heatsinks with a 10K ohm, beta=3435 thermistor, but
I'm not aware of anyone doing that. The silicon die temperature has
the advantage of responding immediately, but the accuracy of the readout
leaves a lot to be desired. Many motherboard monitors could make
temperature measurements via the above stated thermistor (it is a
defacto standard of sorts), but motherboards don't have the two
pin header any more for this. Some did in the past.

This is an example of a thermal design doc from AMD. Page 37 shows
an example of measuring case temperature. Not that any of this
is important :-)

http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/26633_5649.pdf

   Paul

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