How much RAM does the Apple iMac (15 in, September 2003) support?

The iMac (15 in, September 2003) supports up to 1GB of memory across 2 slot(s), up to 0.5GB per slot.

What type of memory does the iMac (15 in, September 2003) use?

It uses DDR DIMM memory modules.

Compatible drive types: IDE / PATA 2.5" Drive.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (15 in, September 2003), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (15 in, September 2003) — matched to its drive bays and slots.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.

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Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (15 in, September 2003), matched to its drive bays and slots.

Guaranteed-compatible SSD and hard-drive upgrades for the Apple iMac (15 in, September 2003) — matched to its drive bays and slots.

This option is out of stock.

The drive bay size is inferred from the system's reported storage interface.
Compatibility is based on published specifications, not yet confirmed against a manufacturer tool.