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Power Macintosh 7500/100 Processor Upgrade And Discussion Page - Performance Of Latest 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
  • Ethernet: AAUI and 10baseT
  • Slots: 3 PCI
  • Drive Bays: 1 (3.5")
  • Supported MacOS: 7.5.2 - 9.x
  • Introduced: 8-8-95
  • Discontinued: 4/96
  • Initial Retail Price: $2,700 - $3,000


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

PowerMac Upgrade & Troubleshooting
Discussion Forum


12/12/00 ..... 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 512MB 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.





** 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.

For G4 Application specific scores - Click Here




"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

Processor Upgrade Card

MacBench 4.0 Processor Score

Power Macintosh 7500/100 162
Sonnet Crescendo G3/375/187/512K 1100
PowerLogix G3/350/175/1MB 1107
NewerTechnology MAXpower G4/350/175/1MB 1118
XLR8 MACh Speed G3/333/222/1MB 1150
Sonnet Crescendo G3/400/200/512K 1173
PowerLogix G4/400/200/1MB 1239
XLR8 MACh Speed G4/400/200/1MB 1259
PowerLogix G3/400/200/1MB 1265
NewerTechnology MAXpower G4/400/200/1MB 1278
Sonnet Crescendo G4/400/200/1MB 1290
Sonnet Crescendo G3/400/200/1MB 1294
XLR8 MACh Speed G3/400/200/1MB 1294
NewerTechnology MAXpower G3/400/200/1MB 1327
XLR8 MACh Speed G3/450/225/1MB 1370
PowerLogix G4/450/225/1MB 1394
XLR8 MACh Speed G4/450/225/1MB 1417
NewerTechnology MAXpower G4/450/225/1MB 1436
Sonnet Crescendo G4/450/200/1MB 1451
PowerLogix G3/500/200/1MB 1462
PowerLogix G4/500/250/1MB 1549
XLR8 MACh Speed G4/500/250/1MB 1574
Sonnet Crescendo G3/500/250/1MB 1617
XLR8 MACh Speed G3/500/250/1MB 1618
NewerTechnology MAXpower G3/500/250/1MB 1642