Apple iMac “PowerPC G3” 400 MHz 1999 Slot-Loading Specs

iMac – M7493LL/A – PowerMac2,1 – M5521

About this iMac

The Apple iMac G3 Blueberry Slot Loading computer came with features that were unique especially as regards its convection cooling system which allowed it to be a quiet machine. There was no internal metal casing and as such, it had a translucent appearance. It also came with a sound system designed by Harmon-Kardon which really stood as a stand-out feature of the device.

400 MHz PowerPC G3

64 MB

10 GB Hard Drive

Plugged-in

Storage

The device was built with 10.0 GB Ultra ATA hard drive storage.

Screen Size and Resolution

The iMac G3 Blueberry Slot Loading had a 15 inch “crystal clear” CRT display with a 13.8 inch viewable area.

Processor & Graphics Processing Unit (GPU)

The iMac G3 Blueberry Slot Loading had Mac OS 8.6 pre-installed on it. The processor that powered the computer was the 400 MHz PowerPC 750 (G3) processor. It’s graphics processor was the ATI Rage 128 VR 2D/3D (AGP 2X) graphics that used up to 8 MB of VRAM.

Memory & Architecture

The device was built with a 512k backside level 2 cache and with a RAM of 64 MB.

Upgradability

Although the iMac G3 Blueberry Slot Loading came with 64 MB of RAM which could be upgraded up to 1 GB of RAM.

The Operating System of the iMac G3 Blueberry Slot Loading can also be upgraded from its pre-installed MacOS 8.6 up to MacOS X 10.3.9.

The iMac G3 Blueberry Slot Loading computer’s dimensions were 38.1 cm x 38.1 cm x 43.4 cm and it featured a weight of 34.7 lbs (15.7 kg).

Inclusive Features

The iMac includes the following features and ports:

A Power Adapter (100V to 260V AC, 150W maximum)
Support for an optional AirPort (802.11b) wireless card.
Slot-Loading CD-ROM drive

Introduced: October 5, 1999		Discontinued: July 19, 2000
Screen Size and Resolution		Memory
Screen Size	15 inches (13.8 viewable area)	Level 1 Cache	64k
Resolution	640×480 @ 117Hz 800×600 @ 95Hz 1024×768 @ 75Hz	Level 2/Level 3 Cache	512k (backside)
Processor		RAM Type	PC100 SDRAM
Processors	1	Min. RAM Speed	10 ns
Architecture	32-Bit	Standard RAM	64 MB
Speed	400 MHz	Maximum RAM	1 GB
Type	PowerPC 750 (G3)	RAM Slots	2
Processor Upgrade	Soldered	Motherboard RAM	None
FPU	Integrated	Graphics
System Bus Speed	100 MHz	Video Card	Rage 128 VR 2D/3D
Cache Bus Speed	200 MHz	VRAM Type	SDRAM
ROM/Firmware	Open Firmware	Standard VRAM	8 MB
EFI Architecture	N/A	Maximum VRAM	8 MB
Storage		Inclusive Features and Ports
Standard Storage	10.0 GB HDD	Standard Optical Drive	4X DVD-ROM
Storage Speed	N/A	Standard Ethernet	10/100Base-T
Storage Dimensions	3.5” (25.4 mm)	Standard Modem	56.6k
Storage Interface	Ultra ATA	Standard Air Port	None
Battery		Standard Bluetooth	None
Type	3.6V Lithium	USB Port 1.1	2
Battery Life	N/A	FireWire Ports	2 (400)
Description		Keyboard	Apple USB Keyboard
Case Type	All-in-One	Inclusive Input	Apple USB Mouse
Form Factor	iMac (Slot Loading)	S-Video Output	None
Apple Order No	M7493LL/A/p>	Microphone	1 (Built-in)
Apple Subfamily	Slot Loading DV	Headphone	2
Apple Model Number	M5521 (EMC 1821)	Sound Out	1
Model ID	PowerMac 2.1	Power Adapter	1

Identifier reference: M7493LL/A, EMC 1821. Use these together because one Apple identifier can sometimes cover multiple configurations.

Last reviewed by Techable: July 30, 2024Identifiers checked: order number, A-number, EMC, and model identifier when available.

Model summary

This iMac at a glance

Family: iMac
Order Number: M7493LL/A
EMC: 1821
Year: 2018

Use the order number, A-number, EMC, and model identifier together when comparing, buying, or selling this device.

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Next steps

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Common questions

Is M7493LL/A the same as the A-number?

Not exactly. M7493LL/A usually points to a specific retail configuration, while the A-number identifies the broader Apple hardware family. Always check the EMC and model identifier too.

What iMac is model this A-number?

This page shows the Apple A-number for the device family. Use the order number, EMC, and model identifier on this page to narrow the exact configuration.

What does EMC 1821 mean?

The EMC number is another Apple hardware identifier. It helps separate closely related models that may share a similar name, year, or A-number.

Can the RAM or SSD be upgraded?

Check the spec table for the exact configuration. Many newer Apple Silicon Macs have memory and storage integrated into the board, so RAM and SSD upgrades are often not practical after purchase.

What macOS versions work with this model?

Use the model identifier, release year, and processor family from the spec table when checking macOS compatibility. Compatibility can change as Apple releases new macOS versions.

Is this iMac still worth buying used?

It can be, depending on price, battery health, memory, storage, and condition. Compare this exact order number and model identifier against similar Techable listings before buying.

How much is this iMac worth?

Value depends on RAM, storage, battery health, cosmetic condition, accessories, and market demand. Use the SellMac path on this page for a quote or use the identifiers here when comparing resale prices.

What should I search if this page is not the exact configuration?

Search the order number first when available, then compare the A-number, EMC, model identifier, year, chip, RAM, and storage. The same A-number can cover more than one configuration.

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