Most system boards can be set to clock externally at 50, 60, or 66 Mhz by
way of jumpers.  The problem is socket 5 boards won't let you do a x3
multiplier.  The processor upgrades overcome this by jumpering certain pins
on the chip to force it to use a x3 multiplier, overriding the multiplier
sourced by the system board.  I've bought a Multimedia CPU upgrade from
www.libi.com for around $30.  This is a little adapter that splits out the
voltage for MMX chips such as the K6 and provides the various multipliers.
It supports up to a K6-233.  You then drop in a K6 or Pentium MMX.
Supposedly it also supports some Cyrix chips but the documentation gets
shaky at that point.  The Evergreen MXPro uses a circuit board to override
the multiplier and an WinChip C6 processor.  This product will take any
system that can be clocked at 66Mhz external and take it to 200Mhz (66x3).
It includes a bios update disk for increased compatibility.  Unfortunately
the WinChip is around 25% slower than a K6-200 using Evergreen's benchmark.

John G. Cakars wrote:

> > Actually, it's been my experience that if he can change the external
> > clock to 66Mhz, the adapter on that upgrade will override the
> > multiplier.  He really can get 66MhzX3=200Mhz with those.  The only
> How would you change the external clock?  Are you saying that someone
> sells a CPU Upgrade adapter, including the CPU?  Or do you buy this in
> pieces and put it together?  Who carries this?  The Evergreen unit that
> was order for the Packard Bell P75, supposedly can handle socket 5 and
> 7.  Is the AMD K6-200 a socket 5 CPU?  I thought it was a socket 7 CPU.
> Are socket 5 and socket 7 CPU's interchangeable?  I was under the
> impression they were not.

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