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IBM RS/6000 - Memory Quick Chart (Memory card to system)
Memory Card Capacities
Memory Card and SIMM Voltages
S1 59F4433
U1 59F4436
S1.5 81F8926
S3.1 00G2208
S3.2 32G1022
S3.3 32G1866
S4.5 52G4801 / 88G3680
S5.0 12H1331
S6 93H5994
Rick Ekblaw opines:
It would appear that U1 manages the 4 SIMMs on the right and
U3 manages the 4 SIMMs on the left, and U2 must be the "memory bus" controller.
S1 59F4433 / 59F4431 (8 SIMM per card)
An SD1 controller has memory controllers 22F9434ESD and 42F6531ESD.
Note: S1 not compatible with S3.1 or higher.
3xx - 320, 32E, 32H
5xx - 520, 52H, 530
7xx - 730, 740
9xx - 930
1MB 59F4581
2MB 59F4582
U1 59F4436 (8 SIMM per card)
Note: Not compatible with any other memory.
5xx - 540 ONLY
S1.5 / HD1 81F8926 / 81F8924 (8 SIMM per card)
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U1,3 37F5699ESD
U2 63F7984ESD
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3xx - 320, 32E, 32H
5xx - 520, 52H, 530
7xx - 730
9xx - 930
An HD1 controller has memory controllers 37F5699ESD and 63F7984ESD
Note: S1.5 not compatible with S3.1 or higher.
4MB 70F9973 1Mx40,4MB
8MB 70F9976 2Mx40,8MB, 80 ns, E
S3.1 00G2208 / 00G2205 (8 SIMM per card) Thanks to Rick Ekblaw
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U1,3 63F7862
U2 82F6767
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3xx - 340, 350
5xx - 53H, 550
9xx - 950
1MB 59F4581 256Kx40,1MB
2MB 59F4582 512Kx40,2MB
4MB 70F9973 1Mx40, 4MB
8MB 70F9976 2Mx40, 8MB, 80 ns, E
S3.2 32G1022 / 32G0101 (8 SIMM per card)
3xx - 340, 350
5xx - 53H, 550, 560
9xx - 950
1MB 59F4581 256Kx40,1MB
2MB 59F4582 512Kx40,2MB
4MB 70F9973 1Mx40, 4MB
8MB 70F9976 2Mx40, 8MB, 80 ns, E
S3.3 32G1866 / 32G1846 (8 SIMM per card)
3xx - 340, 350, 355, 360, 36T, 365, 370, 37T, 375
5xx - 53H, 550, 55L, 560, 570, 580, 58F
7xx - 770, 771
9xx - 950, 970, 97B, 980, 98B
1MB 59F4581 256Kx40,1MB
2MB 59F4582 512Kx40,2MB
4MB 70F9973 1Mx40, 4MB
8MB 70F9976 2Mx40, 8MB, 80 ns, E
16MB 43G1796 4Mx40, 16MB, 60 ns, E
3.x Cards used in 4.x Systems
You can physically install an S3.x card in 3AT / 3BT / 3CT / 380 / 390 / 39H
systems. Even though they officially support S4.5 memory, or greater, on these
systems, there is a potential for someone to put S3.x in. The S3.3 cards have
been installed in several instances. They can possibly result in random
checkstops causing a reboot of the machine. Another symptom is that you
may get a 15% INCREASE in processing speed
with S3.x memory. Although this is good (from a speed related viewpoint), it is
unstable (and unsupported).
The deskside (7013) and rack (7015) models that require memory
cards at S4.5 or higher, have a physical interlock in their design to prevent
plugging in lower level cards, but the desktops (7012) do not.
S4.5 52G4801 / 88G3680
(S4.6 same FRUs and memory capacity) Thanks to Rick Ekblaw
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U1,3 50G6861
U2 50G6858
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3xx - 340, 350, 355, 360, 36T, 365, 370, 37T, 375
5xx - 53H, 550, 55L, 560, 570, 580, 58F, 58H, 590
7xx - 770, 771
9xx - 950, 970, 97B, 980, 98B, 990
Note: S4.5 / S4.6 Downward compatible except with S1 / S1.5 and U1.
1MB 59F4581 256Kx40, 1MB
2MB 59F4582 512Kx40, 2MB
4MB 70F9973 1Mx40, 4MB
8MB 70F9976 2Mx40, 8MB, 80 ns, E
16MB 43G1796 4Mx40, 16MB, 60 ns, E
32MB 65G6452 8Mx40, 16MB, 60 ns, E (88G3680 only?) P/N 64G2074
Function of Resistor Explained
The S4.5 and S4.6 memory cards support 2 different FRU number SIMMs that are equivalent.
4MB SIMM: P/N 70f9973 = P/N 12h1677
8MB SIMM: P/N 70f9976 = P/N 12h1678
16MB SIMM: P/N 43g1796 = P/N 12h1679
32MB SIMM: P/N 39h8312 = P/N 12h1680
Note: The FRU p/n12h16XX SIMMs were
developed with a resistor on the SIMM for the older S4.5 noise problem.
39H Limits
The problem of LED 888/103 145/912 on boot at minimum config with the memory
card plugged in and the 8 SIMMs installed on the CPU of the 39H, will occur if
the SIMM FRUs p/n12h16XX numbers are installed on the CPU.
Note: The base card and CPU must both be
fully populated with the same size SIMMs. The FRU p/n12h16XX SIMMs were
developed with a resistor on the SIMM for the older S4.5 noise problem.
They were not approved for installation on CPUs
that support SIMM modules.
S5.0 12H1331 / 12H1325
(8 SIMM per card) Thanks to Rick Ekblaw
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U1,3 50G6861
U2 26H4374
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5xx - 591, 595
4MB 39H8924
8MB 39H8925
16MB 43G1796
32MB 39H8312
S6 93H5994/ 93H5993 (8 SIMM per card)
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U1,3 50G6861
U2 88H2860
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3xx - 397, 39F
9076 - 160MHz Thin Node
4MB 39H8924 1Mx40, 4MB, 60 ns, E
8MB 39H8925 2Mx40, 8MB, 60 ns, E
16MB 43G1796 4Mx40, 16MB, 60 ns, E
32MB 39H8312 8Mx40, 32MB, 60 ns, E
Memory Card Capacities
Card Type FRU # Max per card
------------ ------- -----
SD1 (S1) 59F4433 32MB
HD1 (S1.5) 81F8926 64MB
HD3 (S3) 32G1022 64MB
(S3.1) 00G2208 64MB
(S3.2) 32G1022 64MB
HD3.3 (S3.3) 32G1866 128Mb
(S4.5) 52G4801 256MB
88G3680
(S4.6) 52G4801 Typo?
(S5.0) 12H1331 256MB
(S6) 93H5994 256MB
Note: It may be that some systems do not
support larger SIMMs (ex. 32MB) so the max per card may vary.
Memory Card and SIMM Voltage
Card Card V SIMM V Speed
SD1 / S1 5.0v 5.0v 80-ns 1mbit
HD1 / S1.5 5.0v 5.0v 80-ns 4mbit
HD2 / U1 (U1???) 3.6v 5.0v 80-ns 4mbit
3.6v 5.0v 85-ns 2mbit
HD3 / SD3 3.6v 5.0v 80-ns 4mbit
HD3.3 / SD3.3 3.6v 5.0v 60-ns 16mbit
HD4 3.6v 5.0v 60-ns 16mbit
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