Power mac g4 mdd ram

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Compatible Memory Upgrades For Your Apple Power Mac G4.

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PowerMac G4 MDD. MacOS 9.2.2 fun

My guess is that they would work, but the Mac may only see them as MB modules. Physically, they will work, but the Mac will only "see" MB on each. I'd imagine you'd still only get 1GB - I'd be willing to bet that the memory controller can probably only see MB per module. Additional sticks did not get him any additional capacity. As someone wrote earlier, that's probably a memory map limitation.

It would probably depend on the DIMMs and what kind of memory chips they are made out of. The limitation is usually the row and column addresses. That was probably me. I tried multiple combinations of modules and it refused to show more than 2GB.

Max RAM supported by Power Mac G4 MDD

Maybe RAM density is playing a part here. I've been working with PCs for years but only came across density recently when upgrading a friend's PC. If I put in one new stick and one old one it would boot but only half of the new stick was recognised. After some google-fu I discovered that some chipsets require low-density RAM. In other words more chips per stick. In this case, with 1GB sticks I needed chips on both sides.

Be sure to not put the 1GB sticks into memory slots that are located next to each other. Its not the memory controller. OS 9 has an address space limit at either 1 or 1.

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  • OS X supports larger amounts It is perfectly valid to speculate that the 2GB limit is not directly a memory controller limitation, but nothing is proven by the fact that OS 9 and OS X have different limits.