Pinouts >  Memory slots and cards connectors
168 pin DIMM connector layout
168 pin DIMM connector
at the motherboard
DIMM=Dual Inline Memory Module
Front Side (left side 1-42, right side 43-84)
Back Side (left side 85-126, right side 127-168)

Front, Left

Pin Non-Parity? Parity? 72 ECC? 80 ECC? Description
1VSSVSSVSSVSSGround
2DQ0DQ0DQ0DQ0Data 0
3DQ1DQ1DQ1DQ1Data 1
4DQ2DQ2DQ2DQ2Data 2
5DQ3DQ3DQ3DQ3Data 3
6VCCVCCVCCVCC+5 VDC or +3.3 VDC
7DQ4DQ4DQ4DQ4Data 4
8DQ5DQ5DQ5DQ5Data 5
9DQ6DQ6DQ6DQ6Data 6
10DQ7DQ7DQ7DQ7Data 7
11DQ8DQ8DQ8DQ8Data 8
12VSSVSSVSSVSSGround
13DQ9DQ9DQ9DQ9Data 9
14DQ10DQ10DQ10DQ10Data 10
15DQ11DQ11DQ11DQ11Data 11
16DQ12DQ12DQ12DQ12Data 12
17DQ13DQ13DQ13DQ13Data 13
18VCCVCCVCCVCC+5 VDC or +3.3 VDC
19DQ14DQ14DQ14DQ14Data 14
20DQ15DQ15DQ15DQ15Data 15
21n/cCB0CB0CB0Parity/Check Bit Input/Output 0
22n/cCB1CB1CB1Parity/Check Bit Input/Output 1
23VSSVSSVSSVSSGround
24n/cn/cn/cCB8Parity/Check Bit Input/Output 8
25n/cn/cn/cCB9Parity/Check Bit Input/Output 9
26VCCVCCVCCVCC+5 VDC or +3.3 VDC
27/WE0/WE0/WE0/WE0Read/Write Input
28/CAS0/CAS0/CAS0/CAS0Column Address Strobe 0
29/CAS1/CAS1/CAS1/CAS1Column Address Strobe 1
30/RAS0/RAS0/RAS0/RAS0Row Address Strobe 0
31/OE0/OE0/OE0/OE0Output Enable
32VSSVSSVSSVSSGround
33A0A0A0A0Address 0
34A2A2A2A2Address 2
35A4A4A4A4Address 4
36A6A6A6A6Address 6
37A8A8A8A8Address 8
38A10A10A10A10Address 10
39A12A12A12A12Address 12
40VCCVCCVCCVCC+5 VDC or +3.3 VDC
41VCCVCCVCCVCC+5 VDC or +3.3 VDC
42DUDUDUDUDon"t Use

Front, Right

Pin Non-Parity? Parity? 72 ECC? 80 ECC? Description
43VSSVSSVSSVSSGround
44/OE2/OE2/OE2/OE2 
45/RAS2/RAS2/RAS2/RAS2Row Address Strobe 2
46/CAS2/CAS2/CAS2/CAS2Column Address Strobe 2
47/CAS3/CAS3/CAS3/CAS3Column Address Strobe 3
48/WE2/WE2/WE2/WE2Read/Write Input
49VCCVCCVCCVCC+5 VDC or +3.3 VDC
50n/cn/cn/cCB10Parity/Check Bit Input/Output 10
51n/cn/cn/cCB11Parity/Check Bit Input/Output 11
52n/cCB2CB2CB2Parity/Check Bit Input/Output 2
53n/cCB3CB3CB3Parity/Check Bit Input/Output 3
54VSSVSSVSSVSSGround
55DQ16DQ16DQ16DQ16Data 16
56DQ17DQ17DQ17DQ17Data 17
57DQ18DQ18DQ18DQ18Data 18
58DQ19DQ19DQ19DQ19Data 19
59VCCVCCVCCVCC+5 VDC or +3.3 VDC
60DQ20DQ20DQ20DQ20Data 20
61n/cn/cn/cn/cNot connected
62DUDUDUDUDon"t Use
63n/cn/cn/cn/cNot connected
64VSSVSSVSSVSSGround
65DQ21DQ21DQ21DQ21Data 21
66DQ22DQ22DQ22DQ22Data 22
67DQ23DQ23DQ23DQ23Data 23
68VSSVSSVSSVSSGround
69DQ24DQ24DQ24DQ24Data 24
70DQ25DQ25DQ25DQ25Data 25
71DQ26DQ26DQ26DQ26Data 26
72DQ27DQ27DQ27DQ27Data 27
73VCCVCCVCCVCC+5 VDC or +3.3 VDC
74DQ28DQ28DQ28DQ28Data 28
75DQ29DQ29DQ29DQ29Data 29
76DQ30DQ30DQ30DQ30Data 30
77DQ31DQ31DQ31DQ31Data 31
78VSSVSSVSSVSSGround
79n/cn/cn/cn/cNot connected
80n/cn/cn/cn/cNot connected
81n/cn/cn/cn/cNot connected
82SDASDASDASDASerial Data
83SCLSCLSCLSCLSerial Clock
84VCCVCCVCCVCC+5 VDC or +3.3 VDC

Back, Left

Pin Non-Parity? Parity? 72 ECC? 80 ECC? Description
85VSSVSSVSSVSSGround
86DQ32DQ32DQ32DQ32Data 32
87DQ33DQ33DQ33DQ33Data 33
88DQ34DQ34DQ34DQ34Data 34
89DQ35DQ35DQ35DQ35Data 35
90VCCVCCVCCVCC+5 VDC or +3.3 VDC
91DQ36DQ36DQ36DQ36Data 36
92DQ37DQ37DQ37DQ37Data 37
93DQ38DQ38DQ38DQ38Data 38
94DQ39DQ39DQ39DQ39Data 39
95DQ40DQ40DQ40DQ40Data 40
96VSSVSSVSSVSSGround
97DQ41DQ41DQ41DQ41Data 41
98DQ42DQ42DQ42DQ42Data 42
99DQ43DQ43DQ43DQ43Data 43
100DQ44DQ44DQ44DQ44Data 44
101DQ45DQ45DQ45DQ45Data 45
102VCCVCCVCCVCC+5 VDC or +3.3 VDC
103DQ46DQ46DQ46DQ46Data 46
104DQ47DQ47DQ47DQ47Data 47
105n/cCB4CB4CB4Parity/Check Bit Input/Output 4
106n/cCB5CB5CB5Parity/Check Bit Input/Output 5
107VSSVSSVSSVSSGround
108n/cn/cn/cCB12Parity/Check Bit Input/Output 12
109n/cn/cn/cCB13Parity/Check Bit Input/Output 13
110VCCVCCVCCVCC+5 VDC or +3.3 VDC
111DUDUDUDUDon"t Use
112/CAS4/CAS4/CAS4/CAS4Column Address Strobe 4
113/CAS5/CAS5/CAS5/CAS5Column Address Strobe 5
114/RAS1/RAS1/RAS1/RAS1Row Address Strobe 1
115DUDUDUDUDon"t Use
116VSSVSSVSSVSSGround
117A1A1A1A1Address 1
118A3A3A3A3Address 3
119A5A5A5A5Address 5
120A7A7A7A7Address 7
121A9A9A9A9Address 9
122A11A11A11A11Address 11
123A13A13A13A13Address 13
124VCCVCCVCCVCC+5 VDC or +3.3 VDC
125DUDUDUDUDon"t Use
126DUDUDUDUDon"t Use

Back, Right

Pin Non-Parity? Parity? 72 ECC? 80 ECC? Description
127VSSVSSVSSVSSGround
128DUDUDUDUDon"t Use
129/RAS3/RAS3/RAS3/RAS3Column Address Strobe 3
130/CAS6/CAS6/CAS6/CAS6Column Address Strobe 6
131/CAS7/CAS7/CAS7/CAS7Column Address Strobe 7
132DUDUDUDUDon"t Use
133VCCVCCVCCVCC+5 VDC or +3.3 VDC
134n/cn/cn/cCB14Parity/Check Bit Input/Output 14
135n/cn/cn/cCB15Parity/Check Bit Input/Output 15
136n/cCB6CB6CB6Parity/Check Bit Input/Output 6
137n/cCB7CB7CB7Parity/Check Bit Input/Output 7
138VSSVSSVSSVSSGround
139DQ48DQ48DQ48DQ48Data 48
140DQ49DQ49DQ49DQ49Data 49
141DQ50DQ50DQ50DQ50Data 50
142DQ51DQ51DQ51DQ51Data 51
143VCCVCCVCCVCC+5 VDC or +3.3 VDC
144DQ52DQ52DQ52DQ52Data 52
145n/cn/cn/cn/cNot connected
146DUDUDUDUDon"t Use
147n/cn/cn/cn/cNot connected
148VSSVSSVSSVSSGround
149DQ53DQ53DQ53DQ53Data 53
150DQ54DQ54DQ54DQ54Data 54
151DQ55DQ55DQ55DQ55Data 55
152VSSVSSVSSVSSGround
153DQ56DQ56DQ56DQ56Data 56
154DQ57DQ57DQ57DQ57Data 57
155DQ58DQ58DQ58DQ58Data 58
156DQ59DQ59DQ59DQ59Data 59
157VCCVCCVCCVCC+5 VDC or +3.3 VDC
158DQ60DQ60DQ60DQ60Data 60
159DQ61DQ61DQ61DQ61Data 61
160DQ62DQ62DQ62DQ62Data 62
161DQ63DQ63DQ63DQ63Data 63
162VSSVSSVSSVSSGround
163CK3CK3CK3CK3 
164n/cn/cn/cn/cNot connected
165SA0SA0SA0SA0Serial Address 0
166SA1SA1SA1SA1Serial Address 1
167SA2SA2SA2SA2Serial Address 2
168VCCVCCVCCVCC+5 VDC or +3.3 VDC
Pinout status: +0 -1
According to 1 reports in our database (0 positive and 1 negative) the DRAM DIMM (168 pin, Unbuffered) pinout may be incorrect.

Is this pinout
NO DIY devices
DRAM DIMM (168 pin, Unbuffered) visual pinout:click to enlarge
Source(s) of this and additional information: Various productsheets at IBM Memory Products, from Hardware Book, Mark Brown
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