My List of Memory Chips/Modules
This page acts as an archive of all the memory chips and memory modules that exist in my collection. Not particularly a fun read for you, but it's useful for me to have this information online.
DRAMs
This includes DRAM ICs that are socketed on video cards in addition to those socketed on old XT and AT motherboards that pre-date the SIPP/SIMM era. No soldered-in chips are included here.
| Make | Model | Qty | Information | Current Location |
|---|---|---|---|---|
| TI | TMS4164-15NL | 20 | Twenty 64-kilobit DRAMS configured as 64Kx1, so 8 KB of RAM per chip. | Loose |
| TI | TMS44C256-80N | 8 | Eight 1024-kilobit DRAMs configured as 256Kx4, so 128 KB of RAM per chip. | On Trident TVGA8900C card |
| TI | TMS44C256-80N | 2 | Two 1024-kilobit DRAMs configured as 256Kx4, so 256 KB of RAM if both these are used. | On Ahead AVGA card (paired with the Sanyo ones below) |
| Sanyo | LC324256P-80 | 2 | Two 1024-kilobit DRAMs configured as 256Kx4, so 256 KB of RAM if both these are used. | On Ahead AVGA card (paired with the TI ones above) |
| Micron | MT4C4256-8 | 2 | Paired with the 100ns ones below to make 4 chips in total. | On STB Powergraph 2.0 ET4000 card. |
| Micron | MT4C4256-10 | 2 | Paired with the 100ns ones above to make 4 chips in total. | On STB Powergraph 2.0 ET4000 card. |
| Sanyo | LC324256P-80 | 8 | Eight 1024-kilobit DRAMs configured as 256Kx4, so 1 MB of RAM if both these are used. | On yellow original Tseng Labs ET4000 card with the 32K HiColor DAC. |
| Hitachi | HM50464P-15 | 2 | Two 64-kilobit DRAMs configured as 64Kx4, so 64 KB if both these are used. | On blue FIDA CGA card. |
| OKI | M41464-10 | 8 | Eight 256-kilobit Page Mode DRAM chips configured as 64Kx4, so 256 KB if all 8 are used. | On Octek Gemini EGA card. |
SRAMs (Cache Chips)
Usually used as L2 cache chips in 486 systems. It is best to keep the 'speed' rating of all your cache chips the same, and match them up to the same speed chip used for Tag RAM (if applicable). Ideally keep to the same manufacturer as well.
| Make | Model | Qty | Information |
|---|---|---|---|
| Winbond | W24129AK-15 | 1 | Each IC is a 16 KB chip, so 4 are needed for 64 KB of cache in a single bank plus 1 more for the Tag RAM. |
| Winbond | W2465AK-15 | 6 | Each IC is an 8 KB chip, so 4 are needed for 32 KB of cache in a single bank plus 1 more for the Tag RAM.. |
| ISSI | IS61C256AH-20N | 4 | Each IC is a 32 KB chip, so 4 are needed for 128 KB of cache in a single bank plus 1 more for the Tag RAM.. |
| ISSI | IS61C256AH-15N | 10 | Each IC is a 32 KB chip, so 4 are needed for 128 KB of cache in a single bank plus 1 more for the Tag RAM.. |
| Samsung | KM6865BP-20 | 1 | Each IC is an 8 KB chip, so 4 are needed for 32 KB of cache in a single bank plus 1 more for the Tag RAM.. |
30-pin SIPP and SIMM Modules
Usually a SIPP or SIMM modules' branding is unknown, so we tend to rely on the manufacturer of the ICs on the module to identify them. The 'speed' ratings can be mixed on a motherboard where, when grouped together, will run at the speed of the slowest SIMM module.
| Make | Model | Module Capacity |
Qty | Information |
|---|---|---|---|---|
| Panasonic | MN41C4256-08 | 256 KB | 3 | Each SIMM is a single-sided, 3-chip module. The MN41C4256 is a 1024 kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 256 KB on the module, plus one chip used for parity. |
| Siemens | HYB514400BJ-70 | 256 KB | 3 | Each SIMM is a single-sided, 3-chip module. The HYB514400BJ is a 1024 kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 256 KB on the module, plus one chip used for parity (SE82C1200).. |
| GoldStar | GM71C4256AJ-80 | 256 KB | 1 | Each SIMM is a single-sided, 3-chip module. The GM71C4256 is a 1024 kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 256 KB on the module, plus one chip used for parity. |
| Samsung | KM44C256AJ-8 | 256 KB | 3 | Each SIMM is a single-sided, 3-chip module. The KM44C256AJ is a 1024 kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 256 KB on the module, plus one chip used for parity (KM41C256J-8). |
| Hyundai | HY514400J-70 | 256 KB | 1 | Each SIMM is a single-sided, 3-chip module. The HY514400J is a 1024 kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 256 KB on the module, plus one chip used for parity (HY531000J-70). |
| NEC | 42400-70 | 256 KB | 3 | Each SIMM is a single-sided, 3-chip module. The 42400 is a 1024 kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 256 KB on the module, plus one chip used for parity (NEC 421000-70). |
| OKI | MSC2331A-80 | 256 KB | 4 | Each SIMM is a single-sided, 3-chip module. The Each chip is 64 KB of RAM (OKI M514256A-80J), so 256 KB on the module, plus one chip used for parity (M51C256A-80). |
| Mitsubishi | M5N41000BJ-7 | 1 MB | 1 | Each SIMM is a single-sided, 9-chip module. The Mitsubishi M5N41000BJ-7 is a 1024-kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 1 MB on the module, plus one chip used for parity (same). |
| TLC | MT4C1024DJ-7 | 1 MB | 2 | Each SIMM is a single-sided, 9-chip module. The Micron Technology MT4C1024DJ-7 is a 1024-kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 1 MB on the module, plus one chip used for parity (same). |
| TLC | KM41C1000BJ-7 | 1 MB | 1 | Each SIMM is a single-sided, 9-chip module. The Samsung KM41C1000BJ-7 is a 1024-kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 1 MB on the module, plus one chip used for parity (same). |
| Hypertec HyperRAM | MB814100A-70 | 4 MB | 4 | Each SIMM is a single-sided, 9-chip module. The Fujitsu MB814100A-70 is a 4096 kilobit Fast Page Mode (FPM) IC. Each chip is 128 KB of RAM, so 4 MB on the module, plus one chip used for parity (same). |
72-pin SIMM Modules
Branding was more common on 72-pin SIMMs where often one of the ICs would have a label. We still tend to rely on the manufacturer of the ICs on the module to truly identify their capability. With 72-pin SIMMs came the introduction of the faster EDO RAM, so some modules will be the older [and slower] FPM RAM while others are EDO. Motherboards need to explicitly support EDO for these to work. The 'speed' ratings can be mixed on a motherboard where, when grouped together, will run at the speed of the slowest SIMM module and you cannot mix FPM and EDO (or can you, as long as a bank isn't mixed?).
| Make | Model | Module Capacity |
Qty | Information |
|---|---|---|---|---|
| Siemens | HYM322160S-60.jpg) |
8 MB FPM | 2 | Each SIMM is a doubled-sided, 16-chip module (non-parity). Each IC is a Siemens HYB514400BJ-60. These are 1024-kilobit Fast Page Mode (FPM) ICs. Each chip is 512 KB of RAM, so 8 MB on each module. |
| Hyundai/Hynix | HYM532220AW-60 |
8 MB FPM | 1 | Each SIMM is a doubled-sided, 4-chip module (non-parity). Each IC is a Hyundai HY518160BJC-60. These are 1024-kilobit (1Mx16) Fast Page Mode (FPM) ICs. Each chip is 2 MB of RAM, so 8 MB on the module. |
| Motorola | MCM54100AN70 |
16 MB FPM | 1 | Each SIMM is a double-sided, 36-chip module. Each IC is a 26-pin SOJ Fast Page Mode (FPM) Motorola MCM54100AN70 chip, which is 4Mx1, holding 512 KB of RAM each, so 16 MB on the module. The module is proprietary for Dell desktops and doesn't fit in a standard 72-pin SIMM slot unless the corner is carefully broken off (see lower right corner). |
| Hyundai | HY5118164BJC-60 |
8 MB EDO | 1 | Each SIMM is a single-sided, 4-chip module (non-parity). Each IC is a Hyundai HY518164BJC-60. These are 1024-kilobit (1Mx16) Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 8 MB on the module. |
| Compaq / Siemens | HYM324025S-60 |
16 MB EDO | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Siemens HYB5117405BJ-60. These are 4096-kilobit Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on the module. |
| Hyundai/Hynix | HYB5117804BJ-60 |
16 MB EDO | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Hyundai HY5117404BJ-60. These are 4096-kilobit Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on the module. |
| PDI | 723596 |
16 MB EDO | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a SiemTek (Siemens) HYB5117405BJ-80. These are 4096-kilobit Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on the module. |
| PDI |  |
16 MB EDO | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is an unknown brand marked as S40041DJ-06. These are 4096-kilobit Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on the module. |
| Texas Instruments | TMS417409ADJ-60 |
16 MB EDO | 6 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Texas Instruments TMS417409ADJ-60. These are 4096-kilobit Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on each module. Tested on 25th April 2023 on PC Chips M590 - working. |
| Texas Instruments | TMS417409ADJ-60 |
16 MB EDO | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Texas Instruments TMS417409ADJ-60. These are 4096-kilobit Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on the module. |
| Texas Instruments | TMS417400ADJ-60 |
16 MB EDO | 2 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Texas Instruments TMS417400ADJ-60. These are 4096-kilobit Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on each module. |
| AZen | KM44C4008-60 |
16 MB EDO | 2 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Samsung KM44C4005-60. These are 4096-kilobit (4Mx4) Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on each module. |
| AZen | RAMS DS4749 |
16 MB EDO | 2 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a RAMS DS4749-60. These are Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on each module. |
| Fujitsu | 8117805A |
16 MB EDO | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Fujitsu 8117805A-60. These are Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on the module |
| Texas Instruments | Z417809DZ-60 |
16 MB EDO | 2 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a TI Z417809DZ-60. These are Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on each module. |
| LG | |
16 MB EDO | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is an LG GM71C17403BJ6. These are Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on the module |
| Micron |  |
16 MB EDO | 2 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is a Micron Technology MT4C4M4E8DJ-6 . These are Extended Data Out (EDO) ICs. Each chip is 2 MB of RAM, so 16 MB on each module |
| (Unknown) | C71C17403BJ6 |
16 MB EDO(?) | 1 | Each SIMM is a single-sided, 8-chip module (non-parity). Each IC is an unknown brand marked C71C17403BJ6. Each chip is 2 MB of RAM, so 16 MB on the module |
| Hyundai | HY5117404BJ-60
|
32 MB EDO | 2 | Each SIMM is a double-sided, 16-chip module. Each IC is a Hynix (Hyundai) HY5117404BJ-60, holding 2 MB of RAM each, so 32 MB on each module. |
168-pin DIMM Modules
18 sticks...
| Make | Model | Module Capacity |
Qty | Information |
|---|---|---|---|---|
| Micron | MT48LC8M8A2-75 | 128 MB | 2 | Each DIMM is a double-sided, 18-chip module (9 per side). Each SDRAM IC is an MT48LC8M8A2-75, holding 8 MB each, so 128 MB on each DIMM. These are ECC (parity) modules rated at PC-100, CL2. Tested on 26th April 2023 using GoldMemory - working |
240 pin DDR2 DIMMs
14 sticks...
| Make | Model | Module Capacity |
Qty | Information |
|---|---|---|---|---|