Macintosh RAM Configurations
----------------------------
Number of Possible
RAM SIMM SIMM Physical
Soldered or DIMM or DIMM RAM
System on Board Slots Sizes Configs(MB) Speed Notes
__________ ________ ________ ____________ ______________ _____ ______
128* 128K 0 N/A 128K N/A
---------- -------- -------- ------------ -------------- ----- ------
512K/512KE* 512K 0 N/A 512K N/A
---------- -------- -------- ------------ -------------- ----- ------
Plus* 0 4 256K,1MB 1,2.5,4 150ns 1,4
---------- -------- -------- ------------ -------------- ----- ------
SE* 0 4 256K,1MB 1,2,2.5,4 150ns 1,4
---------- -------- -------- ------------ -------------- ----- ------
SE/30* 0 8 256K,1MB, 1,2,4,5,8,16, 120ns 4
4MB 17,20,32
---------- -------- -------- ------------ -------------- ----- ------
Classic* 1 2 256K,1MB 1,2,2.5,4 150ns 1,2
---------- -------- -------- ------------ -------------- ----- ------
Classic II* 2 2 1MB,2MB,4MB 2,4,6,10 100ns 3
---------- -------- -------- ------------ -------------- ----- ------
Color 4 2 1MB,2MB,4MB 4,6,8,10 100ns 3
Classic*
---------- -------- -------- ------------ -------------- ----- ------
LC* 2 2 1MB,2MB,4MB 2,4,6,10 100ns 3
---------- -------- -------- ------------ -------------- ----- ------
LC II* 2 2 1MB,2MB,4MB 2,4,6,10 100ns 3,8
4 2 1MB,2MB,4MB 4,6,8,10 100ns 3,8
---------- -------- -------- ------------ -------------- ----- ------
LC III* 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11,
8MB,16MB, 20,36 14
32MB
---------- -------- -------- ------------ -------------- ----- ------
LC 475 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11,
8MB,16MB, 20,36 15
32MB
---------- -------- -------- ------------ -------------- ----- ------
LC 520* 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11
8MB,16MB, 20,36
32MB
---------- -------- -------- ------------ -------------- ----- ------
LC 550* 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11
8MB,16MB, 20,36
32MB
---------- -------- -------- ------------ -------------- ----- ------
LC 575* 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11
8MB,16MB, 20,36
32MB
---------- -------- -------- ------------ -------------- ----- ------
LC 580 4 2 1MB,2MB,4MB 6,7,9,10,12,13,80ns 3,11,
8MB,16MB, 46,21,22,24,28, 18
32MB 36,37,40,52
---------- -------- -------- ------------ -------------- ----- ------
LC 630 DOS 4 3 (1 on 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11,
Compatible the DOS 8MB,16MB, 20,36,52 22
card) 32MB
---------- -------- -------- ------------ -------------- ----- ------
---------- -------- -------- ------------ -------------- ----- ------
Performa 2 2 1MB,2MB,4MB 2,4,6,10 100ns 3
200*
---------- -------- -------- ------------ -------------- ----- ------
Performa 4 2 1MB,2MB,4MB 4,6,8,10 100ns 3,8
400, 405,
410, 430
---------- -------- -------- ------------ -------------- ----- ------
Performa 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11,
450 8MB,16MB, 20,36 14
32MB
---------- -------- -------- ------------ -------------- ----- ------
Performa 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11
460, 466, 8MB,16MB, 20,36
467 32MB
---------- -------- -------- ------------ -------------- ----- ------
Performa 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11,
475, 476 8MB,16MB, 20,36 15
32MB
---------- -------- -------- ------------ -------------- ----- ------
Performa 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11
550 8MB,16MB, 20,36
32MB
---------- -------- -------- ------------ -------------- ----- ------
Performa 4 4 256K,1MB 4,5,8,12,20 80ns 3,10
600* 2MB,4MB,16MB 68
---------- -------- -------- ------------ -------------- ----- ------
Macintosh 4 1 1MB, 4MB 5, 8 80ns 3,11
TV
---------- -------- -------- ------------ -------------- ----- ------
---------- -------- -------- ------------ -------------- ----- ------
II* 0 8 256K,1MB, 1,2,4,5,8, 120ns 1,4,
4MB,16BM 17,20 to 68 5,6,7
---------- -------- -------- ------------ -------------- ----- ------
IIx* 0 8 256K,1MB, 1,2,4,5,8,16 120ns 1,4,5
4MB,16MB 17,20,32 to
128
---------- -------- -------- ------------ -------------- ----- ------
IIcx* 0 8 256K,1MB, 1,2,4,5,8,16, 120ns 4
4MB,16MB 17,20,32 to
128
---------- -------- -------- ------------ -------------- ----- ------
IIci* 0 8 256K,512K, 1,2,3,4,5,6,8, 80ns 3
1MB,2MB,4MB 9,10,12,16,17,
16MB 18,20,24,32 to
128
---------- -------- -------- ------------ -------------- ----- ------
IIfx* 0 8 1MB,4MB,16MB 4,8,16,20,32 80ns 3,9
to 128
---------- -------- -------- ------------ -------------- ----- ------
IIsi* 1 4 256K,512K, 1,2,3,5,9,17 100ns 3
1MB,2MB,4MB
---------- -------- -------- ------------ -------------- ----- ------
IIvi* 4 4 256K,1MB 4,5,8,12,20, 80ns 3,10
2MB,4MB,16MB 68
---------- -------- -------- ------------ -------------- ----- ------
IIvx* 4 4 256K,1MB 4,5,8,12,20, 80ns 3,10
2MB,4MB,16MB 68
---------- -------- -------- ------------ -------------- ----- ------
Centris 4 2 4MB,8MB,16MB, 4,8,12,20,36, 80ns 3,11,
610* 32MB 40,44,52,68 13
---------- -------- -------- ------------ -------------- ----- ------
Centris 4 or 8 4 4MB,8MB,16MB, 4,8,12,16,20, 80ns 3,11,
650* 32MB 24,28,32,36,40, 12,13
44,48,52,56,60,
64,68,72,76,80,
84,88,92,100,
104,108,116,132
---------- -------- -------- ------------ -------------- ----- ------
Centris 4 2 4MB,8MB,16MB, 4,8,12,20,36, 70ns 3,11,13
660AV* 32MB 68
---------- -------- -------- ------------ -------------- ----- ------
Quadra 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11,
605* 8MB,16MB, 20,36 15
32MB
---------- -------- -------- ------------ -------------- ----- ------
Quadra 4 2 4MB,8MB,16MB, 4,8,12,20,28, 80ns 3,11,
610* 32MB 36,40,44,52,68 13
---------- -------- -------- ------------ -------------- ----- ------
Macintosh 4 1 1MB,2MB,4MB 4,5,6,8,12, 80ns 3,11,
630 Family 8MB,16MB, 20,36 17
32MB
---------- -------- -------- ------------ -------------- ----- ------
Quadra 650 8 4 4MB,8MB,16MB, 8,12,16,20, 80ns 3,11,
650* 32MB 24,28,32,36,40, 12,13
44,48,52,56,60,
64,68,72,76,80,
84,88,92,96,104,
108,112,120,136
---------- -------- -------- ------------ -------------- ----- ------
Quadra 4 2 4MB,8MB,16MB, 4,8,12,20,36, 70ns 3,11,13
660AV* 32MB 68
---------- -------- -------- ------------ -------------- ----- ------
Quadra 4 4 1MB,4MB 4,8,20 80ns 3
700*
---------- -------- -------- ------------ -------------- ----- ------
Quadra 0 16 1MB,4MB 4,8,12,16,20 80ns 3
900* 24,28,32,36
40,48,52,64
---------- -------- -------- ------------ -------------- ----- ------
Quadra 950 0 16 1MB,4MB 4,8,12,16,20 80ns 3
24,28,32,36
40,48,52,64
---------- -------- -------- ------------ -------------- ----- ------
Quadra 800 8 4 4MB,8MB,16MB, 8,12,16,20, 60ns 3,11,
800* 32MB 24,28,32,36,40, 12,13
44,48,52,56,60,
64,68,72,76,80,
84,88,92,96,104,
108,112,120,136
---------- -------- -------- ------------ -------------- ----- ------
Quadra 840AV 0 4 4MB,8MB,16MB, 4,8,12,16,20, 60ns 3,11,13
840AV* 32MB 24,28,32,36,
40,44,48,52,
56,60,64,68,72,
76,80,84,88,92,
96,100,104,108,
112,116,120,124,
128
--------- -------- -------- ------------ -------------- ----- ------
Power 0 2 4MB,8MB,16MB, 8MB,12MB,16MB, 80ns 3,11,20
Macintosh 32MB 20MB,24MB,32MB,
5200/75 36MB,40MB,48MB,
Family 64MB
--------- -------- -------- ------------ -------------- ----- ------
Power 0 2 4MB,8MB,16MB, 8MB,12MB,16MB, 80ns 3,11,21
Macintosh 32MB 20MB,24MB,32MB,
6200 36MB,40MB,48MB,
Family 64MB
--------- -------- -------- ------------ -------------- ----- ------
Power 8 2 4MB,8MB, 8,16,24,40,72 80ns 3,11,16
Macintosh 16MB,32MB
6100 Series
--------- -------- -------- ------------ -------------- ----- ------
Power 8 4 4MB,8MB, 8,16,24,32,40, 80ns 3,11,16
Macintosh 16MB,32MB 48,72,80,136
7100 Series
--------- -------- -------- ------------ -------------- ----- ------
Power 0 4 DIMM 4,8,12,16,20 70ns 19
Macintosh 4MB, 8MB, 24,28,32,36,
7200 Series 16MB, 32MB, 40,44,48,56,
64MB 64,72,80,88,
96,112,128,144,
160,176,192,224,
256
--------- -------- -------- ------------ -------------- ----- ------
Power 0 8 DIMM 4,8,12,16,20 70ns 19
Macintosh 4MB, 8MB, 24,28,32,36,
7500 Series 16MB, 32MB, 40,44,48,56,
64MB 64,72,80,88,
96,112,128,144,
160,176,192,224,
256,288,320,352,
384,448,512
--------- -------- -------- ------------ -------------- ----- ------
Power 8 8 4MB,8MB, 8,16,24,32,40, 80ns 3,11,16
Macintosh 16MB,32MB 48,56,64,72,80,
8100 Series 96,104,112,120,
136,144,152,160,
168,176,184,200,
208,216,224,232,
264
--------- -------- -------- ------------ -------------- ----- ------
Power 0 8 DIMM 4,8,12,16,20 70ns 19
Macintosh 4MB, 8MB, 24,28,32,36,
8500 Series 16MB, 32MB, 40,44,48,56,
64MB 64,72,80,88,
96,112,128,144,
160,176,192,224,
256,288,320,352,
384,448,512
--------- -------- -------- ------------ -------------- ----- ------
Power 0 12 DIMM 4,8,12,16,20 70ns 19
Macintosh 4MB, 8MB, 24,28,32,36,
9500 Series 16MB, 32MB, 40,44,48,56,
64MB, 128MB 64,72,80,88,
96,112,128,144,
160,176,192,224,
256,288,320,352,
384,448,512,576,
640,704,768,896,
1024,1152,1280,
1408,1536
---------- -------- -------- ------------ -------------- ----- ------
---------- -------- -------- ------------ -------------- ----- ------
Apple 4 2 4MB,8MB,16MB, 4,8,12,20,36, 80ns 3,11
Workgroup 32MB 40,44,52,68
Server 60*
---------- -------- -------- ------------ -------------- ----- ------
Apple 8 4 4MB,8MB,16MB, 8,12,16,20, 60ns 3,11,12
Workgroup 32MB 24,28,32,36,40,
Server 80* 44,48,52,56,60,
64,68,72,76,80,
84,88,92,96,104,
108,112,120,136
---------- -------- -------- ------------ -------------- ----- ------
Apple 0 16 1MB,4MB 4,8,12,16,20 80ns 3
Workgroup 24,28,32,36
Server 95* 40,48,52,64
__________ ________ ________ ____________ ______________ _____ ______



Notes
_____

* Product no longer being produced by Apple.

1 Third-party 1MB SIMMs which have only two 1MBx4 memory chips soldered on
the SIMM PCB are incompatible with these computers. These computers continue
to support 1MB SIMMs with eight 1MBx1 DRAM chips soldered on the SIMM PCB.
All Apple labeled upgrade kits provide compatible SIMMs for all CPU systems.
These two 1MBx4 1MB SIMMs may be found, however, in Apple Finished Goods
System bundles of the Macintosh SE/30, Macintosh IIci, IIsi, LC and Quadra
950.

2 The Macintosh Classic has 1MB of RAM soldered to the main logic board.
Additional RAM can be added using an expansion card. Apple's Macintosh
Classic 1MB Memory Expansion Card has 1MB of additional RAM and two SIMM
connectors.

3 These systems have 32-bit-clean ROMs. Computers with 32-bit-clean ROMs can
take advantage of more than 8MB of physical RAM under System 7.

4 The ROMs in these systems are not 32-bit clean, but with the 32-Bit System
Enabler for System 7.1, or the appropriate version of MODE32 from Connectix
Corp. for other versions of System 7, they can run in 32-bit mode and can
take advantage of more than 8MB of physical RAM.

5 The Macintosh II and Macintosh IIx require special 4MB SIMMs. Be sure to
specify your Macintosh model when ordering these SIMMs and ensure that the
vendor is aware of the difference. The Macintosh II requires the Macintosh II
FDHD Upgrade to use 4MB SIMMs.

NOTE:
This upgrade is no longer available.


6 To take advantage of more than 8MB of physical RAM, the Macintosh II must
have a PMMU installed, so that the 32-Bit System Enabler (or MODE32 with
versions of System 7 prior to 7.1) can expand the system's memory map.

7 The Macintosh II won't start up if you install 4MB SIMMs in bank A. You'll
hear musical chimes at startup, indicating a hardware failure. Install 4MB
SIMMs in bank B, and use 256K or 1MB SIMMs in bank A.

8 These systems can address a maximum of 10MB of RAM. When the SIMM slots are
filled with 4MB SIMMs, the lower 2MB of DRAM on the logic board can't be
addressed. Please note that the original LC II came in two configurations.
For more information on configurations and limitations, search on "Macintosh
LC II and RAM".

9 The Macintosh IIfx requires 64-pin SIMMs.

10 Only the eight chip 16MBx1 SIMMs have been tested on the Macintosh IIvi
and Macintosh IIvx.

11 These systems use 32-bit wide, 72-pin SIMMs (fast-paged mode) not
previously used in Macintosh computers.

12 The Centris 650, and Quadra 800 use "memory interleaving" which occurs
when SIMM pairs are used (for example: two 8MB SIMMs). This allows the memory
subsystem to perform certain operations faster. Basically, it allows the
memory subsystem to write to the same memory address in different banks of
memory before incrementing the address. Depending on how memory intensive the
application, this can improve performance 5 to 10%.

13 The Centris/Quadra 610, Centris/Quadra 650, and Quadra 800 have flexible
memory systems, meaning that any supported SIMM size can go into any SIMM
socket in any order, and they can run with partially populated banks. They
don't support 1MB, 2MB, or 64MB 72-pin SIMMs.

14 The Macintosh LC III and Performa 450 are functionally similar and have
the same RAM specifications.

15 The Macintosh LC 475, Performa 475/476 and Quadra 605 are functionally
similar and have the same RAM specifications.

16 SIMMs must be installed in pairs of the same size.

17 The Macintosh 630 family includes the Macintosh LC 630, Quadra 630, and
the Performa 630, 635, 636, 637, and 638.

18 The 580 logic board has two SIMM slots. The inside slot can accommodate
only a single-sided SIMM in 1, 4, or 16MB sizes. The outside slot can accept
a double-sided SIMM in 1, 2, 4, 8, 16, or 32 MB sizes.

19 There are several differences between the memory configurations and usage
on the Power Macintosh 7200, 7500, 8500, and 9500 series and other Power
Macintosh computers, including:
- 8-byte, 168 pin DIMMs (Dual Inline Memory Modules), which is a new
industry standard memory module, are used rather than SIMMs. SIMMs are
not compatible with the Power Macintosh 7200, 7500, 8500, and 9500 series
computers.
- The Power Macintosh 9500 is designed to expand to a DRAM capacity of up
to 1.5 GB using 128 MB DIMMs. However, these DIMMs are not currently
available and have not been tested for use with Power Macintosh 9500
series computers.
- No memory is soldered on the logic board of the Power Macintosh 7200,
7500, 8500, and 9500 series computers. At least one RAM DIMM must be
present for the computers to operate. A minimum of 8 MB is required.
- DIMMs can be installed one or more at a time. The Power Macintosh 7500,
8500, and 9500 series computers also support memory interleaving when
DIMMs are installed in pairs and in paired slots. The Power Macintosh
7200 series computers do not support memory interleaving and can be
installed one DIMM at a time.

20 The following computers are in the Macintosh 5200 series: Power Macintosh
5200/75 LC, Macintosh Performa 5200CD, and Macintosh Performa 5215CD.

21 The following computers are in the Macintosh Performa 6200 series:
Performa 6200, Performa 6216, Performa 6218, Performa 6220, and Performa
6230.

22 The Macintosh LC 630 DOS Compatible ships with 4 MB soldered on the logic
board, 4 MB in one of the two SIMM slots on the logic board, and 4 MB in the
single SIMM slot of the DOS Card.