On Tue, 29 Dec 1998, Richard Gooch wrote:
> Dave Cinege writes:
> > Richard Gooch wrote:
> > >
> > > Bryan Burlingame writes:
> > > > The new Celerons (300A and 333) have 128K of L2 cache clocked at the
> > > > processor speed (ala Xeon) compared to the PII's that have 512K of L2 cache
> > > > clocked at 1/2 the processor speed.
> > >
> > > But that doesn't answer my question. Dave was comparing a Celeron 300A
> > > with a PII with "full speed cache". AFAIK a PII with full speed cache
> > > is a Xeon. I'm not aware of a non-Xeon PII with full speed cache. I
> > > wanted to make sure I knew exactly what Dave meant.
> >
> > What I meant is the newer PII's (>=333MHz) run their cache at full speed.
> >
> > Looking over some things I think I'm mistakin though, and was confusing this
> > with the extended memory caching of the 'server' model PII's..
>
> OK, that clears it up. IIRC the older PIIs had L2 at bus speed (either
> 66 MHz or 100 MHz depending on your system). The newer PIIs have L2 at
> half CPU core speed. A definate improvement considering the higher and
> higher core speeds we're seeing (450 MHz last time I looked).
>
> Regards,
>
> Richard....
The PII's have *always* run the L2 cache at 1/2 the core cpu speed...
not at the bus speed which is (so far) maxed at 100mhz. The older
pentium and pentium/mmx had a fully external L2 cache which had to run
at the normal cpu BUS speed, but the pentium pro and pentium II
were designed differently with a L2 bus that is independent of the speed
of the memory bus...
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