Here's a good one to ponder:
I've been wondering for a long time about whether one can successfully use
EDO SIMMs (Extended Data Out) in a 1st generation PPC Mac.
I know that EDO SIMMs will function in a Q950 or 840av,
and also in a 6100, 7100 or 8100,
but their EDO capability is not utilized by the memory controller,
so the benefits of EDO are not achieved.
HOWEVER: (and this is a BIG point)
I've discovered that there IS a 1st-generation PowerMac that has
an EDO-capable memory controller!!!!
It's the WGS 9150 (Apple Workgroup Server 9150).
This brings up two obvious questions.
1. Can EDO SIMMs can be used in a WGS 9150, with their
EDO capabilities FULLY FUNCTIONAL?
2. The WGS 9150 has 8 MB of system RAM soldered to the motherboard.
These RAM chips look like they are NON-EDO.
So even though the 9150's memory controller is EDO-capable,
won't the 8 MB of soldered mainboard RAM make the EDO feature
useless? (i.e. it's kind of like using a SCSI-1 hard drive on a SCSI-2
bus... every device on the SCSI-2 bus will be forced to run at SCSI-1
speeds because the SCSI-1 device creates a bottleneck).
Lastly, if the EDO feature is non-functional because of the non-EDO RAM on
the mainboard, can I REPLACE the mainboard RAM with EDO chips and thus make
the 9150's EDO feature fully functional???
This is the kind of thing that should get a nice debate going on the list -
let's have some fun tackling this one during the weekend.
I've got my soldering iron ready!
Jeff Walther, are you out there?
Any other takers?
TIA!
Greg Shafritz
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