[plug] pc66 ram

[John Knight]

By 'eck, I hope his PC133 stick of 256 still works! His PC66 has the same 
notchings as the 100 and 133 sticks.

>
>Okey dokey....
>
>(dredging up memories of Mac support and repairs :P )
>
>The side notch for the 5V DIMM is centred between the two sets of pins.
>3.3V EDO/FastPage has the notch towards the outside.
>3.3V SDRAM has the notch towards the centre.
>
>Imagine this looks right for 3.3V SDRAM... :)
>
>|UUUUUUU  | |UUUUUUUUUU | | UUUUUUUUUUUUUUUUUU|
>^Outside                  ^Centre
>
>5V EDO/FP memory is used mostly in Performa 5400/6360/6400 and PowerMac
>8500/9500
>
>3.3V EDO was for pretty much only for 7220 & *OLD* Intel LX mainboards
>(you'll know the sort when an LX mainboard has slots for 72-pin SIMMs &
>168-pin DIMMs)
>
>3.3V SD are for G3(66) & G4(100 & now 133) & the plethora of PC combos
>
>And to make matters worse there are numerous Mac clones in the mix too.
>
>If you put RAM in and notice that the memory doesn't quite fit, check
>the RAM stick to see whether the board has marked or has grated the PCB
>- indicating that you're one specification off.
>
>Oh and 3.3V sticks in a 5V motherboard will soooooo void your warranty
>(if you tell them)
>
>Regards,
>
>Criag F.
>
> > -----Original Message-----
> > From: Craig Ringer [mailto:craig at postnewspapers.com.au]
> > Sent: Saturday, July 06, 2002 12:28 AM
> > To: plug at plug.linux.org.au
> > Subject: Re: [plug] pc66 ram
> >
> >
> > >
> > >
> > >t might pay dividends if you check out the voltage
> > requirements of the
> > >RAM and compare it to the voltage options on the motherboard.
> > >
> > >If I remember correctly :
> > >
> > >66 MHz RAM likes 5 volts and 100 MHz & 133 MHz RAM likes 2.8 - 3.2
> > >volts approx. Can somebody else confirm that for me please.
> > >
> > There is 5V PC66 RAM in the usual DIMM format, and there is 3.3V (?)
> > PC66 RAM in the same format. I think they're actually keyed
> > differently
> > (those friendly notches in the DIMM's board), and so 5V PC66
> > won't fit a
> > 3.3V slot, and vice versa. Your board could omit the keying
> > "pin" (ridge
> > in the slot) if it wanted to support both I guess....
> >
> > In general, for very old boards with DIMM slots you need to hit the
> > manual to find out what kind of RAM it wants. This is particularly
> > aggrivating when the manual refers to support for those
> > new-fangled DIMM
> > things.... or at least provides so little info that you can't
> > actually
> > find out what kind it needs, what sizes it supports, etc.
> >
> >
> >
><< smime.p7s >>




Make lunch, not war.


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