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Power Macintosh 7100/66  Processor Upgrade Page - Performance Of Latest G3 And G4 Processor Upgrades

PowerMac 7100/66 Facts at a Glance

  • Processor: PPC 601, 80 MHz
  • Drive: 250MB or 500MB SCSI
  • Internal SCSI: CD ROM Support
  • Slots: 3 NuBus 1 PDS (filled)
  • Installed RAM: 8MB (soldered to motherboard) or 16MB
  • Max RAM 136MB
  • RAM Slots: 4, 72-pin SIMM
  • Min RAM Speed: 80 ns
  • 256 L2 Cache (Optional)
  • Introduced: 3/14/1994
  • Initial Retail Price: $2,899 - 3,989
  • Current Price
    Special Notes
  • 7100AV provided video in and out capabilities and supported 17" and 19" monitors
  • 2X CD-ROM Drive as option


The 7100/66 was a member of the original Power Mac lineup (which also included the 6100 and 8100) the 7100/66 featured one PDS slot and three NuBus expansion slots. These slots had were a source of woe for owners of the 66MHz Power Mac models who installed certain high performance NuBus cards. Three factors contributed to throughput that was less than half that of a high end Quadra: flawed controller circuitry and ROMs and a clock speed that that did not synchronize well with the 20MHz NuBus. The 7100/80 eliminated this last problem but the ROM and control circuitry was a problem common throughout this lineup with the exception of the 8100/110 and 8100/100.

The video setup was an interesting one. The logic board video borrowed RAM for display, up to 640K depending on resolution and color settings. The PDS slot housed a separate video card with 1MB VRAM (2MB for the AV model) making it easy to hook up two monitors at once. The best display, of course, came from the PDS card.

The 7100/66 came with a 256K level 2 cache as an option which can be upgraded to 1MB for a moderate performance boost. The machine shipped with 8MB RAM soldered on to the logic board and with 4, 72-pin slots available for a total of 136MB. RAM has to be installed in pairs of equal size and speed.

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Below you will find the MacBench 4.0 results for all of the current processor upgrades available for this machine. Results marked in Red indicate that benchmark results we provided by the upgrade manufacturer. All other results are from the results of our own testing. 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.

MacBench Absolute Scores

Processor Upgrade Card MacBench 4.0 Processor Score
Power Macintosh 7100/66 117
Sonnet Crescendo G3/266/133/512K 798
Sonnet Crescendo G3/266/133/1MB 925
Sonnet Crescendo G4/300/150/1MB 1032
Sonnet Crescendo G3/300/150/1MB 1035
NewerTechnology MAXpower G3/300/200/1MB 1095
Sonnet Crescendo G3/333/166/1MB 1141