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MicroMac BigSIMM


The MicroMac 64MB or 128MB BigSIMM memory upgrade product increases the memory capacity of certain Macintosh LC, Macintosh Performa, Macintosh Quadra and Power Macintosh models beyond the traditional memory limit to 68MB or 132MB or even more.

Available for:

Mac LC 475, LC575, LC580, LC630, LC630 DOS
Performa 475, Performa 476, Performa 575, Performa 577, Performa 578, Performa 580, Performa 588, Performa 630, Performa 630CD, Performa 630CD DOS, Performa 631CD, Performa 635CD, Performa 636, Performa 636CD, Performa 637CD, Performa 638CD, Performa 640CD DOS
Quadra 605, Quadra 630,

PowerMac 6100/60, PowerMac 6100/60AV, PowerMac 6100/66, PowerMac 6100/66AV, PowerMac 6100/66-DOS,
Performa 6110, Performa 6112CD, Performa 6115CD, Performa 6116CD, Performa 6117CD, Performa 6118CD,
Workgroup Server 6150

MicroMac BigSIMM™ Memory Upgrade

512K Level 2 Cache Card

The logic boards of the above Mac models have 4MB or 8MB soldered onto the logic board. Traditionally the maximum memory configuration has been limited to 32MB SIMMs. MicroMac's BigSIMM product line breaks this memory barrier and allows you to upgrade the memory to 68MB, 132MB, or even more.

What would you rather have, a Mac with not really enough memory or a Mac with lots of memory?

MicroMac BigSIMM Memory Benefits:
Checkmark Breaks the traditional memory barrier
Checkmark Upgrades the memory of single SIMM slot Macintosh computers to 68MB or 132MB
Checkmark Upgrades the memory of double SIMM slot Macintosh computer to up to 196MB
Checkmark Upgrades the memory of PowerMac 6100 and Performa 611x computers to 136MB
Checkmark Speeds up computer operation by avoiding the use of slow virtual memory and RAM Doubler
Checkmark Installs easily and within minutes into the RAM slot of the Mac

Work efficiently with the MicroMac BigSIMM: Every veteran Mac user knows: More memory makes your life a lot easier.
    Let's say, you are working on a report in a desktop publishing application or a mechanical drawing in a CAD program. In order to perform the next step in your work you need to look up some data on the web. So, you start your browser and off you go. You find the document, but it is a PDF file and you need to view it in Acrobat before you can copy the data from that document. Is this really the point where you want to quit your original application, just to be able to launch Acrobat?
    When working with big Photoshop files you can allocate enough memory to the application, so Photoshop does not have to use the much slower hard disk as scratch memory area. The result is a significantly faster operation.
    How about web page design. Do you really want to quit your web page layout program before being able to preview your new page in the browser, or would you rather be able to interactively change the layout and see the results instantaneously in the browser(s)?
    MicroMac's BigSIMM gives you enough RAM to work efficiently.

RAM Disk: Another trick to speed up the operation of a disk access intensive operation, for example data base searches, is to utilize a RAM disk for the storage of the database. Now, when searching the database, the access and search operation can be performed 10 times, maybe even 100 times faster than when operating the database from your hard drive.
    MicroMac's BigSIMM gives you enough RAM to create a good sized RAM disk.

No Virtual Memory, no RAM Doubler: Virtual Memory simulates RAM by utilizing the storage space on the hard drive, which often is 100 times slower than the RAM.
    RAM Doubler trades off CPU power in order to create free RAM. RAM Doubler constantly employs the CPU to compress unused portions of the memory, to move data to presently unused locations, to get data that now are required, decompress that data and load them into the required location.
    In many cases, when you need your Mac to run faster, the alternative to a processor upgrade is to set aside virtual memory and RAM Doubler and use real memory.
    MicroMac's BigSIMM gives you enough RAM to do just that.

System Requirements, Memory configurations, and acceptable SIMM Sizes:

Mac Models

Base Memory

(soldered onto logic board)


slot #1

slot #2

maximum amount of RAM

LC 475, 575, 630

Performa 475, 476, 575, 577, 578, 630,
Performa 630CD, 635CD, 636, 636CD,
Performa 637CD, 638CD

Quadra 605, 630

64MB or

LC 580, 630 DOS,

Performa 580, 588, 630CD DOS,
Performa 631CD, 640CD DOS

64MB or 128MB   

PowerMac 6100/60, 6100/60AV, 6100/66, PowerMac 6100/66AV, 6100/66-DOS

Performa 6110, 6112CD, 6115CD, Performa 6116CD, 6117CD, 6118CD,

Workgroup Server 6150

(needs to be same as slot#2)
(needs to be same as slot#1)

BigSIMM Memory: Engineered with high-quality components, the MicroMac BigSIMM memory is an optimal choice for anyone looking to gain more memory with the resulting speed advantages in overall processing performance and efficiency.

Simple 1-2-3 Installation: Open your Macintosh computer and gain access to the SIMM slot. Take out your existing SIMM and insert the MicroMac BigSIMM in its position. Restart your Mac. The BigSIMM memory will automatically be recognized by your Mac. Enjoy your additional memory and the increased speed.

System Requirements: Mac LC 475, 575, 580, 630, 630 DOS, Performa 475, 476, 575, 577, 578, 580, 588, 630, 630CD, 630CD DOS, 631CD, 635CD, 636, 636CD, 637CD, 638CD, 640CD DOS, Quadra 605, 630, PowerMac 6100/60, 6100/60AV, 6100/66, 6100/66AV, 6100/66-DOS,
Performa 6110, 6112CD, 6115CD, 6116CD, 6117CD, 6118CD, Workgroup Server 6150. 32-bit addressing enabled on all machines.

Tool Requirements: None. However you may want to use an antistatic grounding strap (available at most computer hardware stores).

Time Requirement: About 5 to 10 minutes.

MicroMac Delivers: BigSIMM memory card.


MicroMac #

for Model

Upgrades Memory to

Price in US$



47x, 57x, 58x, 605, 63x, 64x

68MB or more




6100-series, 611x, 6150

(pair required)




47x, 57x, 58x, 605, 63x, 64x

132MB or more



- Available Files to Download for MicroMac BigSIMM Memory -

MicroMac BigSIMM Memory Software:

Utilities Software:
Speedometer 4.0

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This page was last modified on June 21, 1998 

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