hardware guide


     Internet Solutions

     Hardware Guide

          SCSI Guide

          CPU Guide

          Memory Guide

     Company Information


Memory Guide


     Compaq Memory Partnumber Game

    Compaq 60ns 3.3V Buffered ECC EDO (... X 72) DIMM's with Gold contacts

    Kit Size No of DIMM Module 60nsProliant 2500Proliant 5000/ 6500/ 7000PL1200/ 1600/ 3000 WS 5100/ 6000/ 8000
    16MB 1 16MB 270172-B21   4 Kits 2 Kit
    32MB 2 16MB 149023-B21 0.5 Kit 2 Kits 1 Kit
    64MB 4 16MB 241770-B21   1 Kit 0.5 Kit
    32MB 1 32MB 271907-001 1 Kit 4 Kits 2 Kits
    64MB 2 32MB 149024-B21 0.5 Kit 2 Kits 1 Kit
    128MB 4 32MB 241771-B21 0.25 Kit 1 Kit 0.5 Kit
    64MB 1 64MB 271908-001 1 Kit 4 Kits 2 Kits
    128MB 2 64MB 149025-B21 0.5 Kit 2 Kits 1 Kit
    256MB 4 64MB 241772-B21 0.25 Kit 1 Kit 0.5 Kit
    128MB 1 128MB 271909-001 1 Kit 4 Kits 2 Kits
    256MB 2 128MB 149026-B21 0.5 Kit 2 Kits 1 Kit
    512MB 4 128MB 241773-B21 0.25 Kit 1 Kit 0.5 Kit
    256MB 1 256MB 271910-001 1 Kit 4 Kits 2 Kits
    512MB 2 256MB 306541-B21 0.5 Kit 2 Kits 1 Kit
    1024MB 4 256MB 241774-B21 0.25 Kit 1 Kit 0.5 Kit

    So you could actually take 2 Kits of the 149024-B21 PL1600 Kits in order to make a 128MB Kit 241771-B21 for the Proliant 6500.
    Please be advised, that you can only use the EDO DIMM's in the Proliant 5000 if the Memory boards were replaced with the EDO Spacing ones: 219481-B21 Fast Page/EDO Conversion Kit for 1GB for PL5000
    PL 5000/6000/6500/7000 Pentium Pro Servers all use FPM or EDO, must add 4 DIMM's at the time. The 4 DIMM's should all be from the same OEM manufacturer. Please be advised, that you can not use FPM DIMM's in the 5500/6000/6500/7000 Servers with XEON CPU's since there memory controller actually operates the DIMM's in EDO mode inorder to provide 0 wait-state to the 100 MHz Frontside-bus of the processors.

    Compaq 60ns 3.3V Buffered ECC FPM (... X 72) DIMM's with Gold contacts

    Kit Size No of DIMM Module 60ns DP XL Pent Pro Proliant 5000
    16MB 2 8MB 210948-001 1 Kit 2 Kits
    32MB 2 16MB 228417-001 1 Kit 2 Kits
    64MB 2 32MB 228418-001 1 Kit 2 Kits
    64MB 4 16MB 219282-001 0.5 Kit 1 Kit
    128MB 2 64MB 228419-001 1 Kit 2 Kits
    128MB 4 32MB 219283-001 0.5 Kit 1 Kit
    256MB 4 64MB 219284-001 0.5 Kit 1 Kit
    512MB 4 128MB 219285-001 0.5 Kit 1 Kit

    So you could actually take 2 Kits of the 228419-001 DP XL in order to make a 128MB Kit 219283-001 for the Proliant 5000. Please be advised, that some systems were shipped with Samsung DIMM's that can not coexist with other DIMM's (Mfg by Compaq or others). You must remove the original memory in such a case.

    EDO non Parity (... X 32) SIMM's with Tin contacts

    Kit Size No of SIMM Module 70ns 60ns ProLinea (840 & 1.6GB) 575-5166Prolinea 2000,4000,6000
    8MB 2 4MB 243011-001 243011-002 1 Kit 1 Kit (must be 60ns)
    16MB 2 8MB 243012-001 243012-002 1 Kit 1 Kit (must be 60ns)
    32MB 2 16MB 243013-001 243013-002 1 Kit 1 Kit (must be 60ns)
    64MB 2 32MB 243014-001 243014-002 1 Kit 1 Kit (must be 60ns)

    Non Parity (... X 32) SIMM's with Tin contacts

    Module70ns OptionCompaq ProLinea (not enhanced)Deskpro (but not DeskPro XL)
    466 4100575-51336150e450-4100575 - 5166

    The ProLinea Enhanced Models (4/100, 4/33s, 4/50, 4/50s, 4/66) Use Gold Parity SIMM's like the DeskPro I.

    Parity (... X 36) SIMM's with Gold contacts

    Module80ns Option70ns OptionSpare/AlternativeCompaq DeskproProsignia 3-500 ProLiant
    IMXEXE5XL not pent proVS/4Pentium 10001000Pent-400015004500
    1MB   141682-001 118740-001,141752-001 1 1 1 4          
    2MB 118689-001 141683-001 or 113923-001 1 1 1 4 2     1   
    4MB 118690-001 141684-001 136817-001 147522-001 1 1 1 4 2 1 2 1 4 2
    8MB 128877-001 141685-001 147523-001 1 1 1 4 2 1 2 1 4 2
    16MB 149320-001 190747-001 or 139143-001, 139917-001    1 4 2 1 2 1 4 2
    32MB 149147-001 190748-001 or 139918-001 147525-001     1 4 2 1 2 1 4 2

    Please note, that you can take 2 or 4 SIMM's to make one of the Kit's shown below. Furthermore, you can use faster (60ns) SIMM's instead of the slower (70ns or 80ns) ones. 80ns SIMM's are no longer available from Compaq, and are hard to get as compatible ones.

    All Kit's with Parity (... X 36) 72 pin SIMM's with Gold contacts

    Size# of SIMM'sSIMM size Speed [ns]Compaq P/NSystem
    2MB 1 2MB 70ns 141683-001 DP I, M, XE (486)
    4MB 1 4MB 70ns 141684-001 DP I, M, XE (486)
    8MB 4 2MB 70ns 149911-001 XE5, Pentium Proliant 1000
    8MB 2 4MB 70ns 148188-001 DP XL, Pentium Prosignia, Proliant 1500
    8MB 1 8MB 70ns 141685-001 DP I, M, XE (486)
    16MB 1 16MB 70ns 190747-001 XE (486), Prosignia VS, Proliant 1000
    16MB 4 4MB 70ns 149949-001 XE5, Pentium Proliant 1000 - 4000
    16MB 4 4MB 80ns 136816-001 Proliant 1000 Pentium, Proliant 2000 486, Prosignia P5/60
    16MB 2 8MB 70ns 148189-001 DP XL, Pentium Prosignia, Proliant 1500
    16MB 2 8MB 60ns 169169-001 PL 1500 5/133
    32MB 1 32MB 70ns 190748-001 XE (486), Prosignia VS, Proliant 1000
    32MB 4 8MB 70ns 149912-001 XE5, Pentium Proliant 1000 - 4000
    32MB 4 8MB 80ns 136817-001 Proliant 1000 Pentium, Proliant 2000 486, Prosignia P5/60
    32MB 2 16MB 70ns 148190-001 DP XL, Pentium Prosignia, Proliant 1500
    32MB 2 16MB 60ns 169170-001 PL 1500 5/133
    64MB 4 16MB 70ns 149913-001 XE5, Pentium Proliant 1000 - 4000
    64MB 4 16MB 80ns 149341-001 Proliant 1000 Pentium, Proliant 2000 486, Prosignia P5/60
    64MB 2 32MB 70ns 148191-001 DP XL, Pentium Prosignia, Proliant 1500
    64MB 2 32MB 60ns 169171-001 PL 1500 5/133
    128MB 4 32MB 70ns 149914-001 XE5, Pentium Proliant 1000 - 4000
    128MB 4 32MB 80ns 139918-001 Proliant 1000 Pentium, Proliant 2000 486, Prosignia P5/60
    256MB 4 64MB 70ns 188056-001 PL 4500/133
    512MB 8 64MB 70ns 188476-001 PL 4500

    Please note, that you can take 2 Kit's with 2 SIMM's to make a Kit of 4 or split a Kit of 4 etc. e.g. 2 141685-001 (8MB) can be used to make 1 Kit 148189-001 (16MB) e.g. 2 148191-001 (64MB Kit ea) equal 1 Kit 149914-001 (128MB) e.g. 2 190748-001 (32MB 70ns) and 1 169171-001 (64MB 60ns Kit) would also work to substitute 1 Kit 149914-001 (128MB)

    All Kit's with Parity (... X 9) 30 pin SIMM's with tin contacts

    Size # of SIMM's SIMM size Speed [ns] Compaq P/N System
    2MB 2 1MB 80ns 141738-001 Prolinea 3/25zs & 3/25s
    8MB 2 4MB 80ns 141742-001 Prolinea 3/25zs & 3/25s

     Chip Part Numbers
    The purpose of this guide is to help you identify and describe memory in case of any doubts.

    This section will help you decipher what the markings on your memory chips mean. Memory chips are usually mounted on various kinds of modules, like SIMMs, which are designed to work in computer systems. Often the memory module has a part number, and the memory chips that are mounted on the module will have different part number(s). To identify the memory you are looking at, the chip part number (not the module part number) is by far the most important. The chip part number, along with the number of chips per module, allow us to determine the function and capacity of the module.

    Memory chips tend to have 2 or 3 lines of text on them that include a part number, speed, and date code. Most part numbers start with a two or three character abbreviation that identifies the manufacturer, such as:

    HM  (Hitachi), 
    M5M (Mitsubishi), 
    TMS (Texas Instruments) 
    MT  (Micron Technology). 
    The numbers (and sometimes letters) that follow describe the memory configuration of the chip, for example HM514400 is a 1Mx4 configuration.

    After the part number, there is usually a "A", "B", "C", or "D." This is how the manufacturer grades the performance of the memory, with "A" being most superior and "D" least, e.g. HM514400A. Major Manufacturers normally have very stringent requirements on all the memory they produce, so all grades should perform as well in personal computers.

    Memory from unknown/smaller manufacturers or memory chips that were remarked is deemed to be far less reliable. It is advisable to stay away from this kind of memory. Such memory generally carries only a 90 Day or 1 Year Warranty.

    In many cases, there will be an additional letter that codes the package type of the memory, e.g. HM514400AS. In this example, "S" stands for SOJ-type packaging.

    On most chips, there is a date code printed above or below the part number. The date code indicates when the chip was made, most typically in a year and week format (such as 9438 for the thirty-eighth week of 1994). Often, the decade's "place" will be left off. For example, 438 may also represent the thirty-eighth week of 1994

    To ease readability, the table lists part numbers without speed or grade information. The real chip part numbers will look a little longer. A couple of examples of 1Mx4's: "HM514400ALTT7", or "KM44C1000AJ-7

    Common Part Numbers*

    256Kx4 256Kx18
    4 = 512*36
    4 = 1*36
    use 9 = 1*9
    use 8 = 1*32
    use 9 = 4*9
    4Mx4 2k
    use 8 = 4*32 2k
    4Mx4 4k
    use 8 = 4*32 4k
    use 2 = 1*32
    use 4 = 2*36
    Hitachi HM514256 HM514280   HM511000 HM514400 HM514100 HM5117400 HM5116400 HM5118160  
    Hyundai HY534256     HY531000 HY514400 HY514100 HY5117400 HY5116400    
    LG/Goldstar        GM71C4100   GM71C17400      
    MicronTech MT4C4256     MT4C1024 MT4C4001 MT4C1004 MT4LC4M4B1 MT4LC4M4A1    
    Mitsubishi M5M44256     M5M41000 M5M44400 M5M44100 M5M5117400 M5M5116400    
    NEC 424256     421000 424400 424100 4217400 4216400    
    NPN       NN511000 NN514400          
    Oki         M514400C   M5117400      
    Samsung/SECKM44C256 KM418C256 KM49C512 KM41C1000 KM44C1000 KM41C4000 KM44C4100 KM44C4000 KM416C1200  
    Sharp         LH6B4400K          
    TI TMS44C256     TMS4C1024 TMS44400 TMS44100 TMS417400 TMS416400 TMS418160  
    Toshiba TC514256 TC514280   TC511000 TC514400 TC514100 TC5117400 TC5116400   TC5118180
    Jumper settings

    Common EDO Part Numbers*

    use 9 = 1*9
    use 8 = 1*32
    use 9 = 4*9
    use 8 = 4*32 2k
    use 4 = 2*32
    use 2 = 1*32
    use 4 = 2*36
    Fujitsu     814405C          
    Hitachi     HM514405          
    Hyundai         HY5117404      
    IBM         28H5067      
    LG Semicon         GM71C17403 GM71C18163    
    MicronTech MT4C16270   MT4C4007J   MT4LC4M4E8 MT4LC2M8E7 MT4LC1M16E5  
    Motorola     MCM5L4400          
    NEC             4218165  
    Samsung/SEC        KM44C4104 KM416C1204    
    Siemens         HYB5117405 or 300   HYB5118165  
    Toshiba           TC5118165    
    Hitachi HM51164405 4M*4 4K (use 16 for a 8*32 SIMM EDO or 8 for a 4*32 SIMM EDO)

    Most major chip makers use part number schemes like those above, where information about the chip is more or less encoded in the part number. However, some IBM part numbers follow a less self-explanatory scheme. Older IBM part numbers generally follow the pattern: NNLNNNN (where "N" is a number, and "L" is a letter) as in 89X8922 or 02G2871.

     Memory Speed
    Speed of the memory is an important factor that determine its value and usefulness. Carrying over from the previous example, a 70ns chip may be encoded at the end of the part number, e.g. HM514400AS7. In this case, the "7" stands for 70ns. Sometimes there is a dash before the speed marking, e.g. KM44C1000AJ-7, and other times the speed is printed on a line above or below the part number. If the speed is printed on a separate line, a dash usually precedes the speed number. For most common memory chips, speed ranges from 50ns to 120ns. The trailing zero is commonly left off, so you may see "-6", "-7", "-8", "-10", or "-12", which represents 60ns, 70ns, 80ns, 100ns, and 120ns respectively.

     Chip Packages

          SOJ or Small Outline J-lead

          TSOP or Thin Standard Outline Package

    A more modern but less commonly seen chip package is the TSOP. TSOPs are very thin, compact packages that take up a minimum of space. While their small outline shows how dense memory can be made, TSOPs are more likely to be susceptible to physical damage from rough handling. TSOPs come in 300 and 400 mil sizes. These chips are normally used to make Credit Card memory for Notebooks.

          DIP or Dual Inline Package

    The DIP was more widely used before the SOJ became the favored package type. DIP leads often go through the PCB board, in contrast with the surface mounted SOJ and TSOP. These chips are only used in 8088 - 80286 and a few early 386 machines where the memory chips are directly plugged into the sockets in the board rather than mounted on a memory module.
    Cache SRAM Chips are commonly used in DIP-Packages.

          ZIP or Zigzag Inline Package

    The ZIP is also commonly seen on older memory products. They are also favored in applications where board space is limited (e.g. older workstations with a lot of memory).

          PLCC or Plastic Leaded Chip Carrier

    The PLCC is typically only seen in lower capacity configurations, usually 256kx1 or more rarely 1Mx1. It is distinguished by having leads on all four sides.

     Different Types of Modules
    The two most common types of memory modules are the 30 pin and 72 pin Single Inline Memory Modules or SIMMs.

          30 Pin SIMM

    You will typically find either 2, 3, 4, 8, or 9 memory chips on 30-pin SIMMs. Any given 30-pin SIMM is likely to be populated with identical memory chips, except the 3-chip SIMM. 3-chip SIMMs are likely to have 2 chips of the same type, and a third parity chip which is different from the other two in order to provide the parity bit.

    The most common varieties of 30-pin SIMMs are listed in the table below:
    Module Capacity No ParityParity
    256KB 256Kx8 256Kx9
    1MB 1Mx8 1Mx9
    4MB 4Mx8 4Mx9
    Although 16Mx8 and 16Mx9 are also possible, they are virtually not used at all. Most 386 and older 486 PC's use 4 Parity Modules per memory bank. 386SX and 286 systems generally only use 2 30 pin SIMM's
    Most Mac's use 'No Parity' Modules.

          72 Pin SIMM

    The most common varieties of 72-pin SIMMs are:
    Module Capacity No ParityParity
    4MB 1Mx32 1Mx36
    8MB 2Mx32 2Mx36
    16MB 4Mx32 4Mx36
    32MB 8Mx32 8Mx36

    Most of the new lower end systems sold today can take advantage of the EDO modules, thus bringing approx. 10-15% more speed. These are generally also tin modules.
    Most newer entry level systems use tin SIMM sockets, and must therefore also use SIMM's with tin contacts. These systems do usually not have parity checking capabilities (use ..Mx32 SIMM's).
    The top-of-the-line Systems (in particular Pentium Pro boards) use DIMM's rather than SIMM's.
    Most servers and newer high-end systems use gold SIMM sockets, and must therefore also use SIMM's with gold contacts. These systems usually also use parity checking, to avoid any system errors if a memory chip should fail. Compaq's Proliant Servers even use this parity bit for error correcting and not only for checking. SIMM's are installed 4 at the time. This gives 16Bit to hold the information needed for ECC for every 128Bit of data stored.
    72-pin SIMMs that do not have parity (x32) usually have only one kind of chip per module. For example, a 2Mx32 (8MB) can be constructed with 16 chips of 1Mx4 (such as a 424400-70). 72-pins with parity are likely to have two varieties of chips on board. For example, a 1Mx36 usually has 8 chips of one type (1Mx4, like a 424400-70) and 4 chips of another (1Mx1, like a 421000-70).

          SIMM Details

    32MB 70ns Parity Gold SIMM (Single Inline Memory Module) 24-Chip

    Jumper Description

      Jumper 0 Pin 76 In this example not present
    R1 Jumper 1 Pin 67 In this example not set
    R2 Jumper 2 Pin 68 In this example set
    R3 Jumper 3 Pin 69 In this example set
    R4 Jumper 4 Pin 70 In this example not set
      Jumper 5 Pin 71 In this example not present
      Ground Pin 72  

    Most modules do not explicitely have all 6 jumpers marked since the jumpers 0 & 5 are normally open and 3 & 4 are never set on a 60ns module, one can save a couple pennies by omitting them...

    The capacitors C3, C4 are decoupling condensators for higher frequencies. C25 is a filter condensator for lower frequencies. On other modules you may find different numberings and/or locations and/or counts of the capacitors.

    In addition to this you will commonly find a decoupling capacitor for each DRAM-Chip, either under or next to the chip.

    SIMM Jumper Settings

    60ns 70ns 80ns Comment
    4MB 12.. 123. 12.4  
    8MB .... ..3. ...4  
    16MB 1... 1.3. 1..4  
    32MB .2.. .23. .2.4 32MB 70ns Parity SIMM shown above

    A Number in a field represents the Jumper (0 Ohm SMD Resistor) set i.e. this pin is connected to ground (pin 72).
    Likewise a . represents a open connection.

    Some systems check for the actual SIMM speed installed. I.e. Installing a faster SIMM than specified may not work even though technically it would.

          DIMM or Dual Inline Memory Module, 168 pin

    Higher-end computers use DIMMs, which are usually 168 pin.
    The jedec standard describes basically 9 different industry standard DIMM's. These different DIMM's are encoded with the two half round holes that are cut out at the connector side of the DIMM. So a mixup can not damage neither the system nor the DIMM, as it is not possible to insert the wrong DIMM's into the slots.
    Compaq uses the newer 3.3V technologie, and the DIMM's are double buffered. Those DIMM's are 8 Byte wide, so a 64MB DIMM is actually a 8MB by 72 (8*8 + 8Bit Parity = 72 Bit). Compaq's DIMM's are 60ns and Gold plated.
    In Compaq's Servers you add 4 DIMM's at the time. So the memory path is 256 bit wide, and the ECC (Error Checking and Correcting) -logic uses 32 Bit per memory address. Compaq's PC's only need 2 DIMM's per installation increment.
    Apple computers use 5V DIMM's and are the most common available, and therefore the least expensive ones. However they are not compatible with Compaq systems and vica versa, and will not fit into the slots.
    Some older proprietary DIMM's are 200 pin.

          SIPP or Single Inline Pin-leaded Package
    Many older personal computers and workstations used SIPP memory, which look like 30-pin SIMMs with pins instead of an edge connector. This design was not as well received as the SIMMs because the pins tended to bend or break easily.

          Other SIMMs
    Less common SIMMs include 40, 64, 68 and 80 pin SIMMs. The 64 pin SIMM looks like a smaller 72 pin SIMM and is easily confused for one. Some 64 pin SIMMs function like 30 pin SIMMs while others function like 72 pin SIMMs.


[top of page] [home] [doc] [search] [comments]
this is a page built and maintained with PReP
last build: November 02, 1998 author: th