There currently are 444MHz modules in there.
You sure it can run up to 533MHz?
From the user guide:
DIMMs must be installed in equal-sized pairs and fit these specifications:
• PC2-4200, 533 MHz, Double-Data-Rate 2 (DDR2) DIMMs, also known as DDR2-533
• 64-bit wide, 240-pin modules
• 18 memory devices maximum per DIMM
• Conform to JEDEC specification (see note below)
• Error-correcting code (ECC) or no error-correcting code (NECC) modules. Do not mix
ECC and NECC memory modules within a pair.
• Unbuffered (not registered or buffered)
• Maximum height of 1.25 inches
Important: DIMMs from older Macintosh computers are not compatible with and do
not fit in your Power Mac G5.
Note: When purchasing DIMMs for use in Macintosh computers, make sure that the
memory vendor conforms to the Joint Electron Device Engineering Council (JEDEC)
specification. Check with your memory vendor to ensure that the DIMMs support the
correct timing modes and that the Serial Presence Detect (SPD) feature has been
programmed properly, as described in the JEDEC specification. To check the
compatibility of your DIMMs, see the Macintosh Products Guide on Apple’s website at
Going by this on your link...
This memory is designed for the following systems: Apple iMac G5 17-inch 1.9GHz (iSight) (DDR2); Apple iMac G5 20-inch 2.1GHz (iSight) (DDR2).
Cross checking here...
2.0GB (2048MB) PC4200 DDR2 533MHz 240 Pin DIMM Module for the Apple iMac G5/1.9GHz, iMac G5/2.1GHz Models, PowerMac G5 'Dual Core' Models (pairs required for PowerMac)...
Looks like the same RAM is used for the Dual Core G5 Powermacs.
Sorry to dig up an old topic, but I have some similar inquiries.. I've been trying to find out if the G5 can actually support more than 16 GB RAM. You say it can support 4 GB modules.... thus the limiting factor might be the memory controller's inability to address > 16 GB.
Also, DDR2-667 and 800 areactualy cheaper than DDR2533 these days. Would it be reasonable to assume that if I bought a DDR-667 or 800 module, it would drop to 533 speeds and maybe even to a lower CAS latency... say CL3-3-3?