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Picking the right RAM for 7600

erichelgeson

Well-known member
The more I read the more confused I get when choosing the right RAM for my 7600/120. I currently have 2x16 == 32mb of ram but would like a bit more to run OS 9.

This page lists many different types that are "compatible" with the 7600 - https://www.memoryx.com/powermac7600.html

EDO or FPM? - Which is preferred? Can they be mixed? How do I tell what I have in it currently?

2k/4k refresh? - Spec seems to be 2k but does 4k work (seems to be more 4k out there)

60/70ns? - Can they be mixed? How do I tell what I have? What is preferred? 

5V - Yes

ECC - No

Any other on specifics? Reputable places to purchase?

Thanks!

 

erichelgeson

Well-known member
Here's the conflicting information I'm reading:

http://macgurus.com/products/motherboards/mbppc75-7600.php

Note: MacGurus recommends the use of 168-pin, 5v EDO 64-bit, 2k refresh, 60ns DIMMs in this machine. EDO DIMMs are engineered to higher tolerances, and are more compatible with G3 processor upgrades. FPM DIMMS and 5v EDO DIMMS can be mixed in this machine.
vs.

https://www.oempcworld.com/support/mac_memory_explained.html

Although you will not derive any performance benefits by using EDO DIMMs, you can use them in the following Power Macintosh computers: ... 7600 ...


Which leads me to think that FPM is the way to go?

 
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Unknown_K

Well-known member
As far as EDO or FPM, I guess it depends on if you have any old PCs that can use the EDO DIMMs and whatever the price differential is.

Some SUN machines and some Pentium Pro motherboards can use EDO DIMMs.

2K and 4K refresh is only important if you want to use the RAM in a 6400/6500 system.

 

erichelgeson

Well-known member
Thanks for the info @Unknown_K! This will be just for the 7600.

Went with the 6x64MB Apple PowerMac 168-pin FPM 4K 5V Buffered DIMM (p/n APL168B64/4K) @ $9 to make it 416mb of RAM total. More then I need but will give me some room to play.

Edit: whoops, just noticed I posted this in the NuBus form - apologies! 

 
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