PowerPC Processor Upgrades for LC PDS

Apple Power Mac Processor Upgrade
DayStar PowerCard 601
Sonnet Presto PPC 605

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The Apple Power Mac Processor Upgrade (APMPU) plugs into the processor direct slot (PDS) of the LC 475, LC 575, LC 580, LC 630, Performa 475-476, Performa 575-578, Performa 580-588, Performa 630 series, Quadra 605, and Quadra 630.

This upgrade is not compatible with the 040 PDS in the Centris line, the Quadra 610, or the Quadra 650-950. These models accept the Apple Power Mac Upgrade Card.

The APMPU was built by DayStar, which sold several versions under the PowerCard 601 name. After DayStar went out of business, Sonnet picked up their 100 MHz design and sold it as their Presto PPC upgrade, which has since been discontinued.

The APMPU requires System 7.5 or later and at least 8 MB of installed RAM.

The APMPU has a 66 MHz PowerPC 601 processor, which operates at twice the speed of the '040 processor installed in the computer it is upgrading. All three versions of the card are compatible with Mac OS 8.1; with Sonnet's drivers, their card also supports Mac OS 8.5-8.6.

Details, Apple

requires "fat" System 7.5 to 8.1
requires Apple "Power Macintosh Card" control panel
CPU: 66 MHz PowerPC 601
CPU speed: runs at twice speed of '040 CPU
- 50 MHz in LC 475, Performa 475-476, Quadra 605
- 66 MHz in 33 MHz models
ROM: Apple PowerPC ROMs
RAM: uses memory on computer motherboard
L2 cache: 256 KB

Details, DayStar PowerCard 601

requires "fat" System 7.5 to 8.1 (only certified to 7.5.1)
requires Daystar "PowerPro" or Apple "Power Macintosh Card" control panel
CPU: 50, 66, or 100 MHz PowerPC 601
ROM: Apple PowerPC ROMs
RAM: uses memory on computer motherboard
L2 cache: 256 KB

Details, Sonnet Presto PPC 605

requires "fat" System 7.5 to 8.1, Mac OS 8.5-8.6 with Sonnet enabler
requires Sonnet's Mac OS Enabler software
CPU: 100 MHz PowerPC 601
ROM: Apple PowerPC ROMs
RAM: uses memory on computer motherboard
L2 cache: 256 KB

Online Resources

Macintosh Processor Upgrade: Description, Apple TIL 16722
Macintosh Processor Upgrade Card: Read Me, Apple TIL 73000
Macintosh Processor Upgrade: Frequently Asked Questions, Apple TIL 16832
DayStar Turbo 601, Apple Macintosh Processor Upgrade, and DayStar PowerCard 601, MacUser, 1995:07
Sonnet Presto PPC, 100 MHz 601, 256 KB cache
Unofficial PowerPro 601 Page
Apple Power Macintosh Upgrade Card/Daystar PowerPro 601 compared, Apple TIL 14885
Vintage Macs, the email list for 68040-based Macs
Apple Specs Online for upgraded LC 475/Quadra 605, LC 575, LC 580, LC/Performa/Quadra 630 series

Cautions

You must have a "fat" system installed to use a PowerPC upgrade.

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