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Index

• Compaq Memory Partnumber Game
• Chip Part Numbers
• Memory Speed
• Chip Packages
  • SOJ or Small Outline J-lead
  • TSOP or Thin Standard Outline Package
  • DIP or Dual Inline Package
  • ZIP or Zigzag Inline Package
  • PLCC or Plastic Leaded Chip Carrier
• The Different Types of Modules
  • 30 Pin SIMM
  • 72 Pin SIMM
  • SIMM Details
  • DIMM or Dual Inline Memory Module, 168 pin
  • SIPP or Single Inline Pin-leaded Package
  • Other SIMMs
• Links

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

Kit Size	No of DIMM	Module	60ns	Proliant 2500	Proliant 5000/ 6500/ 7000	PL1200/ 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) 575-5166	Prolinea 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

Module	70ns Option	Compaq ProLinea (not enhanced)				Deskpro (but not DeskPro XL)
		466	4100	575-5133	6150e	450-4100	575 - 5166
4MB	172712-001	1	1	2	2	1	2
8MB	172713-001	1	1	2	2	1	2
16MB	172714-001	1	1	2	2	1	2
32MB	172715-001	1	1	2	2	1	2

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

Module	80ns Option	70ns Option	Spare/Alternative	Compaq Deskpro					Prosignia 3-500		ProLiant
				I	M	XE	XE5	XL not pent pro	VS/4	Pentium 1000	1000Pent-4000	1500	4500
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's	SIMM size	Speed [ns]	Compaq P/N	System
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

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	512Kx9 4 = 1*36	1Mx1 use 9 = 1*9	1Mx4 use 8 = 1*32	4Mx1 use 9 = 4*9	4Mx4 2k use 8 = 4*32 2k	4Mx4 4k use 8 = 4*32 4k	1Mx16 use 2 = 1*32	1Mx18 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/SEC	KM44C256	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*

	256Kx16 256Kx16	1Mx1 use 9 = 1*9	1Mx4 use 8 = 1*32	4Mx1 use 9 = 4*9	4Mx4 use 8 = 4*32 2k	2Mx8 use 4 = 2*32	1Mx16 use 2 = 1*32	1Mx18 use 4 = 2*36
Fujitsu			814405C
Hitachi			HM514405
Hyundai					HY5117404
IBM					28H5067
LG Semicon					GM71C17403	GM71C18163
MicronTech	MT4C16270		MT4C4007J		MT4LC4M4E8	MT4LC2M8E7	MT4LC1M16E5
Mitsubishi
Motorola			MCM5L4400
NEC							4218165
NPN
Oki
Samsung/SEC					KM44C4104	KM416C1204
Sharp
Siemens					HYB5117405 or 300		HYB5118165
TI
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.

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.

SOJ or Small Outline J-lead

By far the most common package type is the SOJ (Small Outline 'J' lead). SOJ chips come in three different sizes: 300, 350, and 400 mil. The mil size actually refers to the width of the chip in thousandths of an inch. All other things being equal, the same chip in a larger package tends to have less market value. However, the functionality is not influenced by this.

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.

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.

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).

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.

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

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 Parity	Parity
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.

The most common varieties of 72-pin SIMMs are:

Module Capacity	No Parity	Parity
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).

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.

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.

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.

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.

• The RAM guide