Seriously underclocked

boostland wrote:
 > 2.2 volts is to low for that cpu that could be what is stopping it running
 > at the proper speed.
 > If you set the multiplier a 2x the chip will run at 6x.
 > That would be way to much for a k6 3, the later mobile k6 3+ chips could hit
 > 600mhz tho.



 >
  >>I know it's ancient history, but I'm putting together a machine for my 7
  >>y.o. son.
  >>
  >>I ran across this mobo from a salvaged system
  >>(http://web.epox.com/html/motherboard.asp?product=EP-58MVP3C-M&lang=1)
  >>and replaced the AMD-K6 233 with a K6-2 450 that I bought for next to
  >>nothing on eBay. Well, come to find out the Epox 58MVP3C-m only
  >>supports K6-2 when it's revision 1.0 or greater
  >>
 >
 > (http://web.epox.com/html/support-article.asp?Article=4p3T3LF41F4r3HH01c0X1b
 > m00IO32no11fY33L).
 >
  >>I've looked at the board and don't see any reference to a revision
  >>number and I've only been able to get the CPU up to 350 MHz. Is there
  >>some off chance that I've missed something and actually can squeeze that
  >>last 100 MHz out of this chip?
  >>
  >>I've got the jumpers set this way:
  >>
  >>Multiplier = 5
  >>Bus clock = 100 MHz
  >>CPU voltage = 2.2 v(chip is rated at 2.5v)
  >>
  >>I've played with them a bit bit they didn't make much difference -- 350
  >>MHz was the best I could get.
  >>
  >>Thanks.
  >>
  >>Seriously underclocked,
  >>
  >>Mark

Thanks for the reply boost. Okay if I read you correctly, I need to up
the voltage on the chip (which is rated at 2.5v) to 2.8v (the only step
up) and watch the temp.
and stability.

This FAQ seems to describe a way that I may be able to select more than
the documented voltages:

<a rel="nofollow" style='text-decoration: none;' href="http://web.epox.com/html/motherboard-download.asp?id=4uw33oG41aX4h3H0C10xb10Mi03OP23dW4G01o1y3f2C1F1DI0P1L2B3V04T1d3o&product=4O3Xm34h1Ct43h0hC1x0b1M00i3o2p3Iw4V01X3qs2b31i1K2AO4t02oV0&media=P43YL34hE14u3H0h1cx01B0m0I3O2Nd22Xx10q&lang=1&date=4lW33ne41B4s3h0hc1x0B1M00iO3x2l1c14X3c2P3O2Rr32oC3" target="_blank">http://web.epox.com/html/motherboard-download.asp?id=4uw33oG41aX4h3H0C...b10Mi03</a>

Problem is, I don't know how to read this table:

===========Quote:
Additional core voltage options.
  On selected models further core voltage selections may be used even
though no actual jumper option is listed. Two jumpers must be used to
obtain additional voltages that are not listed in the documention or
board surface. Listed below are these optional core voltage options that
can be obtained. Not all models and board revisions will have jumpers
for all core voltages listed below. Only use core voltages for which
your processor (CPU) is rated for!

No voltage jumpers = 2.0v (approx.),
Jumper 2.1 and 2.2 = 2.3v (approx.),
Jumper 2.1 and 2.4 = 2.5v (approx.),
Jumper 2.2 and 2.4 = 2.6v (approx.),
Jumper 2.1 and 2.8 = 2.9v (approx.),
Jumper 2.2 and 2.9 = 3.1v (approx.),
Jumper 2.1 and 3.2 = 3.3v (approx.),
Jumper 2.2 and 3.2 = 3.4v (approx.),
Jumper 2.4 and 3.2 = 3.5v (approx.).
========End Quote

The jumpers are simply five pairs that setup like this in the docs.

1+6 = 2.1 volts reserved
2+7 = 2.2 volts reserved for AMD K6 3D CPU's in the future
3+8 = 2.8 volts for Pemtium MMX and Cyrix 6x86L
4+9 = 2.9 volts for AMD K6 PR2-166200MHz and Cyrix 6x86MX
5+10= 3.2 volts for AMD K6 PR2-233MHz

The most obvious interpretation is that if I use a jumper to select
2.1volts (pins 1+6) and add another jumper for 2.4volts (which I don't
see), I get a total of 2.5volts(?) Makes me think this mobo is NOT a
"selected model".

But are you also saying I could only do this in this motherboard with a
K6-3?

Thanks for the help and sorry for the peskiness, but the more I read
about this stuff, the more confused I get.

Mark
 >> Stay informed about: Seriously underclocked 

Okay, I got it.

According to the system monitor it is drawing 2.75 volts. So far,it is
stable and the chip's temp.is reading right at 65C (149F).

I'm pretty happy.

Thanks!

Mark

Mark Adams wrote:
 > boostland wrote:
 >
  >> 2.2 volts is to low for that cpu that could be what is stopping it
  >> running
  >> at the proper speed.
  >> If you set the multiplier a 2x the chip will run at 6x.
  >> That would be way to much for a k6 3, the later mobile k6 3+ chips
  >> could hit
  >> 600mhz tho.



  >>
   >>> I know it's ancient history, but I'm putting together a machine for my 7
   >>> y.o. son.
   >>>
   >>> I ran across this mobo from a salvaged system
   >>> (http://web.epox.com/html/motherboard.asp?product=EP-58MVP3C-M&lang=1)
   >>> and replaced the AMD-K6 233 with a K6-2 450 that I bought for next to
   >>> nothing on eBay. Well, come to find out the Epox 58MVP3C-m only
   >>> supports K6-2 when it's revision 1.0 or greater
   >>>
  >>
  >> (http://web.epox.com/html/support-article.asp?Article=4p3T3LF41F4r3HH01c0X1b
  >>
  >> m00IO32no11fY33L).
  >>
   >>> I've looked at the board and don't see any reference to a revision
   >>> number and I've only been able to get the CPU up to 350 MHz. Is there
   >>> some off chance that I've missed something and actually can squeeze that
   >>> last 100 MHz out of this chip?
   >>>
   >>> I've got the jumpers set this way:
   >>>
   >>> Multiplier = 5
   >>> Bus clock = 100 MHz
   >>> CPU voltage = 2.2 v(chip is rated at 2.5v)
   >>>
   >>> I've played with them a bit bit they didn't make much difference -- 350
   >>> MHz was the best I could get.
   >>>
   >>> Thanks.
   >>>
   >>> Seriously underclocked,
   >>>
   >>> Mark
 >
 >
 > Thanks for the reply boost. Okay if I read you correctly, I need to up
 > the voltage on the chip (which is rated at 2.5v) to 2.8v (the only step
 > up) and watch the temp.
 > and stability.
 >
 > This FAQ seems to describe a way that I may be able to select more than
 > the documented voltages:
 >
 > <a rel="nofollow" style='text-decoration: none;' href="http://web.epox.com/html/motherboard-download.asp?id=4uw33oG41aX4h3H0C10xb10Mi03OP23dW4G01o1y3f2C1F1DI0P1L2B3V04T1d3o&product=4O3Xm34h1Ct43h0hC1x0b1M00i3o2p3Iw4V01X3qs2b31i1K2AO4t02oV0&media=P43YL34hE14u3H0h1cx01B0m0I3O2Nd22Xx10q&lang=1&date=4lW33ne41B4s3h0hc1x0B1M00iO3x2l1c14X3c2P3O2Rr32oC3" target="_blank">http://web.epox.com/html/motherboard-download.asp?id=4uw33oG41aX4h3H0C...b10Mi03</a>
 >
 >
 > Problem is, I don't know how to read this table:
 >
 > ===========Quote:
 > Additional core voltage options.
 > On selected models further core voltage selections may be used even
 > though no actual jumper option is listed. Two jumpers must be used to
 > obtain additional voltages that are not listed in the documention or
 > board surface. Listed below are these optional core voltage options that
 > can be obtained. Not all models and board revisions will have jumpers
 > for all core voltages listed below. Only use core voltages for which
 > your processor (CPU) is rated for!
 >
 > No voltage jumpers = 2.0v (approx.),
 > Jumper 2.1 and 2.2 = 2.3v (approx.),
 > Jumper 2.1 and 2.4 = 2.5v (approx.),
 > Jumper 2.2 and 2.4 = 2.6v (approx.),
 > Jumper 2.1 and 2.8 = 2.9v (approx.),
 > Jumper 2.2 and 2.9 = 3.1v (approx.),
 > Jumper 2.1 and 3.2 = 3.3v (approx.),
 > Jumper 2.2 and 3.2 = 3.4v (approx.),
 > Jumper 2.4 and 3.2 = 3.5v (approx.).
 > ========End Quote
 >
 > The jumpers are simply five pairs that setup like this in the docs.
 >
 > 1+6 = 2.1 volts reserved
 > 2+7 = 2.2 volts reserved for AMD K6 3D CPU's in the future
 > 3+8 = 2.8 volts for Pemtium MMX and Cyrix 6x86L
 > 4+9 = 2.9 volts for AMD K6 PR2-166200MHz and Cyrix 6x86MX
 > 5+10= 3.2 volts for AMD K6 PR2-233MHz
 >
 > The most obvious interpretation is that if I use a jumper to select
 > 2.1volts (pins 1+6) and add another jumper for 2.4volts (which I don't
 > see), I get a total of 2.5volts(?) Makes me think this mobo is NOT a
 > "selected model".
 >
 > But are you also saying I could only do this in this motherboard with a
 > K6-3?
 >
 > Thanks for the help and sorry for the peskiness, but the more I read
 > about this stuff, the more confused I get.
 >
 > Mark
 >
 >> Stay informed about: Seriously underclocked