[KianD]

I can't find specs anywhere on wheter the PowerMac 5400 can take 3.3v EDO DIMMs I know it came with 5v, and RamJet have 5v for it, but neither everymac, lowendmac or Apple's own specs make any distinction between voltages.

Anyone have any insights before I drop €20 on 64MB of potentially useless memory?

[tooki]

Apple's developer notes say explicitly that 3.3v is not supported. It requires 5V.

The dev note also doesn't mention EDO, just regular DRAM, but I do believe that it's one of the models that accepts either EDO or FPM.

tooki

[Eriamjh]

Most of the old apple stuff is 5V. I don't know if they support EDO or not. (They might, as Tooki says, since they support something called "Memory interleaving" which requires matched pairs.).

[tooki]

The 5400 explicitly does not support interleaving. Only some models did that, not all.

tooki

[P]

EDO is backwards compatible with FPM, so EDO memory works, but the EDO feature is not supported - they work as FPM chips on a 5400. I think it's only the 4400 and some Powercomputing clones that really require FPM DIMMs.

[tooki]

The 4400, 5500 and 6500 require EDO RAM, some 3.3V, some 5V. The 7200/8200 absolutely requires FPM, as using EDO in it can actually cause damage (most high-end Mac clones are based on the 7200 motherboard, while most cheaper ones were based on the 4400).

tooki