I concur. Different speed Ram is just a crash waiting to happen.
As to Ram speed, If I remember correctly, the simms for my Old Mac Plus
were 90 nano. Four of the one MB simms cost me over $800 in '86.
a little side note as to memory costs:
The first one hundred of Intel's 36MB back planes, for the USPS Mail
sorting machines, cost $18,000.@ and stair stepped down to $10,0800.@
... when that was the leading edge of technology. The original P.O. was
for $46,000,000. The next contract, one year later, they were only $5,400@.
RHB
"Michael S. Macdonald" wrote:
>
> Wayne wrote:
>
> >Interesting, I looked at the site you mentioned and compared these sticks I
> >took out, (various 32s and 8s) and there is a variety of speeds and refresh
> >rates. One I found out is even an EDO stuck in there with all the other
> >FPMs.
> >If I reinstall the FPMs, how much of an effect will having different refresh
> >rates and speeds be? And could having that EDO stick in there been part of
> >the problems we've been having with this machine?
> >And... can I use this EDO in a PowerCenter Pro (the other machine we have
> >here along with our PowerWaves)?
>
> Acccck! A direct question !!
>
> Clearly, dimms with different speeds and refresh rates, heck even different
> types CAN work
> together, you proved that by having them installed and using the computer(s)
>
> OTOH, your powerwave 604/150 was 'particularly problematic'
>
> The effect of using different speed and refresh rate dimms will be random
> freezing, probably sooner the more apps that are opened and ram 'reserved'
>
> Why is there more than one speed ram anyway? Beats me... I suppose that
> faster ram is slightly more expensive ...
> I believe that all Macs and clones of the Clone era used either 60 or 70 ns
> ram.
>
> But get this, the PowerMac 7600/132 and PowerWave 132 are fraternal twins,
> yet NewerTech's Guru utility calls for 70 ns ram for the Apple and 60 ns
> ram for the PCC product.
>
> As far as I know, EDO can coexist peacefully with FPM, although I
> understand that some machines may halve the value of the dimm, ie an EDO
> dimm may be 32 MB in a machine
> set up for EDO and 16 mb in a machine set up for FPM.
>
> If the ram worked in the PowerWave, it'll work in the PowerCenterPro. If it
> caused problems in the PowerWave, it'll cause them faster in the
> PowerCenterPro because it is more 'highly strung'
> than the PowerWave.
>
> Again, my best advice is to use the dimms that are the same spec and put
> the rest in a drawer
>
> Cheers...Michael
>
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