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Power Macintosh 7500/100 Upgrade And Information Page - Performance Of G3 & G4 Processor Upgrades

PowerMac 7500/100 Facts at a Glance

  • Processor: 601, 100 MHz
  • Bus Speed: 50 MHz
  • L2 Cache: Optional (Max 1 MB)
  • Installed RAM: 8 or 16MB (Max 1 GB*)
  • RAM Slots: 8, 168-pin DIMM
  • Min RAM Speed: 70 ns
  • Installed VRAM: 2MB (Max 4 MB)
  • Drive: 500MB or 1GB (SCSI)
  • Internal SCSI: Fast SCSI 10MB per sec
  • CD Drive:4X
  • Removable Drives: Floppy Drive
  • Ethernet: AAUI and 10baseT
  • Slots: 3 PCI
  • Drive Bays: 1 (3.5")
  • Additional Ports: ADB, 2 Serial - Printer & Modem , SCSI
  • Supported MacOS: 7.5.2 - 9.x
  • Introduced: 8-8-95
  • Discontinued: 4/96
  • Initial Retail Price: $2,700 - $3,000
  • Current Price


  • *128MB DIMMs can be used, but have not been tested
  • Has composite and S-video input ports

PowerMac Upgrade & Troubleshooting
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Page Retired 11/26/01 .. See Current Page

The Power Macintosh 7500/100 was one of the machines of the second wave of PowerMacs. It was considered a mid-level machine and was part of the group of computers which comprised the 7200 at the low end and the 8500 and 9500 at the high end. The 7500 has a 601 PowerPC processor clocked at 100Mhz. The 601 processor is relatively slow and was already outclassed by other processors at the time of its use in this machine. The 601 was abandoned with the next generation of PowerMacs.The 7500's processor resides on a separate daughter card making it easily upgradable to a faster processor.

The 7500 was a very popular machine and one of the first to offer such easy upgradability. The machine is easy to get into and sports 3 PCI slots, an extra drive bay and 8 memory slots for a total possible capacity of 1 GB of RAM.

The machine shipped with 2MB of video RAM and the ability to add 2 more. It shipped without a L2 cache, but had an empty slot for adding a cache chip.

Adding a 512K L2 cache should gain you an approximately 18% processor speed improvement, although finding one that works properly in the 7500 has proved a problem for some owners. Make sure that the cache you consider buying is guaranteed to work properly in your machine.



Below you will find the MacBench 4.0 results for the current processor upgrades available for this machine. Results marked in blue indicate that benchmark results were done by us. All other processor card results were provided by the upgrade manufacturer. The bar graphs below express results as a percentage of improvement over the base machine, which receives a score of 100%. Further down the page you will find a table with the actual MacBench score.

** Note that MacBench does not take advantage of the "Velocity Engine" (AltiVec instructions) of the G4. For AltiVec accelerated applications you can see a 1.5 to 4 times performance improvement over the G3, depending on the application and the functions you are trying to perform. For example, in our tests, encoding a QuickTime movie took half the time using a G4 processor upgrade over a similarly clocked G3. Using certain Photoshop filters or a SoundJam MP3 encoding, took 2/3 of the time. Keep this in mind when evaluating the scores below.

"But I thought that the G4 was so much faster than the G3?" In some cases it is! For G4 Application specific scores - Click Here

MacBench Absolute Scores

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