iMac G3 Model M4984 Video Ram Replacement

System

Last updated on Sep 17, 2016

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Easy

Introduction

Go to step 1 ↓

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.

What you need

Tools

1. Step 1 iMac G3 Model M4984 Video Ram Replacement
  The iMac G3. This was a great computer for the time, and had plenty of features.
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2. Step 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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3. Step 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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4. Step 4
  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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6. Step 5
  Remove the power cable from the logic board assembly.
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7. Step 6
  Remove the front panel connector.
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8. Step 7
  Now, remove these Phillips screws.
  
  Now, grab the logic board assembly by the piece of plastic, and lift it out.
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10. Step 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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11. Step 9
  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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12. Step 10
  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.
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