iMac G3 Model M4984 Video Ram Replacement

简介

The iMac G3 had onboard video which usually means no upgrade-ability. The iMac developers found a way to allow video upgrade-ability (sort of); they built 2MB on to the logic board to power the ATI 3D Rage Pro Turbo PCI, and added a video ram DIMM slot on the motherboard allowing users to upgrade their video ram using proprietary Apple DIMMs.

你所需要的

步骤 1 Logic Board

iMac G3 Model M4984 Video Ram Replacement, Logic Board: 步骤 1 中的图像 1，1

The iMac G3. This was a great computer for the time, and had plenty of features.

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步骤 2

Start by flipping the iMac upside-down. It may help to lay it on a towel, so you don't damage the screen, or scratch the face.

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步骤 3

iMac G3 Model M4984 Video Ram Replacement: 步骤 3 中的图像 3，3

Remove this Phillips screw.
Using a flathead screwdriver, work your way around the bottom cover, until it comes off.
Then, lift the bottom cover up and out, and set it aside.

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步骤 4

iMac G3 Model M4984 Video Ram Replacement: 步骤 4 中的图像 3，3

Now, remove the DB-15 Video connector from the logic board.
It may be helpful to use a Phillips screwdriver to remove the thumbscrews.

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步骤 5

iMac G3 Model M4984 Video Ram Replacement: 步骤 5 中的图像 3，3

Remove the power cable from the logic board assembly.

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步骤 6

Remove the front panel connector. (You may also need to remove an additional screw that connects the front panel connector to the logic board assembly).

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步骤 7

iMac G3 Model M4984 Video Ram Replacement: 步骤 7 中的图像 3，3

Now, remove these Phillips screws.
Now, grab the logic board assembly by the piece of plastic, and lift it out.

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步骤 8

The logic board assembly. This is the heart of the computer, it contains the motherboard, CPU, RAM, V-RAM, PRAM battery, the hard drive, and the optical drive.

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步骤 9 Video Ram

iMac G3 Model M4984 Video Ram Replacement, Video Ram: 步骤 9 中的图像 1，2

iMac G3 Model M4984 Video Ram Replacement, Video Ram: 步骤 9 中的图像 2，2

The Video-RAM DIMM slot is located on top of the logic board. Most people confuse this with the system RAM which is hidden under the CPU Shield.
The GPU: an ATI 3D Rage Pro Turbo PCI with 2MB onboard + the video RAM DIMM:
The Video RAM DIMM:

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步骤 10

iMac G3 Model M4984 Video Ram Replacement: 步骤 10 中的图像 3，3

To remove the V-RAM, push the retaining tabs out, and the DIMM should pop up, then pull it out.
The 2MB of V-RAM soldered to the logic board:
According to what I've read, the iMac will support 10MB Total V-RAM, 2MB onboard, 8MB DIMM.