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Re: Can a Pentium-4 CPU partially fail? (internal cache performance degradation)

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Bill Davidsen wrote:

> > But the memtest shows something interesting.
> >
> > Instead of getting this:
> >
> > L1 cache - 8kb   - 20763 mb/sec
> > L2 cache - 512kb - 17714 mb/sec
> > Memory - 512mb   -  1052 mb/sec
> >
> >
> > I get this:
> >
> > L1 cache - 8kb   - 87xx mb/sec
> > L2 cache - 512kb - 65xx mb/sec
> > Memory - 512mb   -  559 mb/sec
> >
> > This CPU is SL6EG.
> 
> You haven't told us if these CPUs have hyperthreading,

The SL6EG does not have hyperthreading:

http://www.cpu-world.com/sspec/SL/SL6EG.html

The only .13 micron (Northwood) CPU's to have hyperthreading were the
ones that ran at 3.08 ghz.

I see this from the wiki article on Pentiums:

--------
Overclocking early stepping Northwood cores yielded a startling
phenomenon. While core voltage approaching 1.7 V and above would often
allow substantial additional gains in overclocking headroom, the
processor would slowly (over several months or even weeks) become more
unstable over time with a degradation in maximum stable clock speed
before dying and becoming totally unusable. This became known as Sudden
Northwood Death Syndrome (SNDS), which is caused by
electromigration.[11]
--------

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Thread

Can a Pentium-4 CPU partially fail?  (internal cache performance  degradation) Intel Guy <Intel@Guy.com> - 2013-03-23 13:22 -0400
  Re: Can a Pentium-4 CPU partially fail?  (internal cache performance  degradation) Bill Davidsen <davidsen@tmr.com> - 2013-03-24 20:49 -0400
    Re: Can a Pentium-4 CPU partially fail?  (internal cache performance  degradation) Intel Guy <Intel@Guy.com> - 2013-03-24 21:30 -0400
      Re: Can a Pentium-4 CPU partially fail?  (internal cache performance  degradation) Bill Davidsen <davidsen@tmr.com> - 2013-03-29 23:57 -0400
      Re: Can a Pentium-4 CPU partially fail? (internal cache performance degradation) BW <bruce56@topmail.co.nz> - 2013-04-06 05:16 -0700

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