Dell EMC PowerEdge R840 Installation and Service Manual

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System board connectors

The following diagram and table describe the system board connectors and jumpers.

This image shows the system board connectors. — Figure 1. System board connectors

Table 1. System board jumpers and connectorsSystem board jumpers and connectors
Item	Connector	Description
1	D7, D1, D8, D2, D9, D3	Memory module sockets
2	J_ODD	Optical drive power connector
3	J_FAN_6	Cooling fan 6 connector
4	CPU4	CPU4 processor and heat sink module socket—with dust cover
5	J_BP_PWR0	Backplane power connector
6	J_FAN_5	Cooling fan 5 connector
7	J_BP_SIG_B	Backplane B signal connector (rear)
8	D6, D12, D5, D11, D4, D10	Memory module sockets
9	J_FAN_4	Cooling fan 4 connector
10	C7, C1, C8, C2, C9, C3	Memory module sockets
11	J_FAN_3	Cooling fan 3 connector
12	CPU3	CPU3 processor and heat sink module socket—with dust cover
13	J_FAN_2	Cooling fan 2 connector
14	J_BP_SIG_A	Backplane A signal connector (front)
15	C6, C12, C5, C11, C4, C10	Memory module sockets
16	J_BP_PWR1	Backplane power connector
17	J_FAN_1	Cooling fan 1 connector
18	PCIe_M3	PCIe Signal M3 connector
19	PCIe_M1	PCIe Signal M1 connector
20	PCIe_M2	PCIe Signal M2 connector
21	CPU2	CPU2 processor and heat sink module socket—with dust cover
22	B3, B9, B2, B8, B1, B7	Memory module sockets
23	B10, B4, B11, B5, B12, B6	Memory module sockets
24	J_PIB_SIG1	Power Interposer Board signal connector
25	J_RISER2	PCIe riser 2 connector
26	J_PIB_PWR 4	PIB power connector 4
27	J_PIB_PWR 3	PIB power connector 3
28	J_PIB_PWR 2	PIB power connector 2
29	J_PIB_PWR 1	PIB power connector 1
30	U_USB_RECONN	USB Client power management
31	J_BATT_PWR	NVDIMM-N battery power connector
32	J_BATT_SIG	NVDIMM-N battery signal connector
33	J_TPM_MODULE	TPM connector
34	CMOS Battery	CMOS Battery connector
35	J_SLOT4	PCIe x16 connector
36	J_SLOT3	PCIe x16 connector
37	J_USB_INT	Internal USB connector
38	J_SATA_1	NPIO connector1 for x8 backplane
39	J_NDC	NDC connector
40	J_RISER1	PCIe riser 1 connector
41	J_SATA_2	NPIO connector 2 for x8 backplane
42	J_PSWD	Reset BIOS password
43	NVRAM_CLR	Clear NVRAM
44	J_FRONT_VIDEO	Video connector
45	J_SATA_3	SATA C connector—Optical drive SATA connector
46	A3, A9, A2, A8, A1, A7	Memory module sockets
47	A10, A4, A11, A5, A12, A6	Memory module sockets
48	CPU1	CPU1 processor and heat sink module socket—with dust cover
49	PCIe_M5	PCIe Signal M5 connector
50	PCIe_M6	PCIe Signal M6 connector
51	PCIe_M4	PCIe Signal M4 connector

CAUTION When replacing the system board, disconnect the cables from the system board, but do not disconnect the cables attached to the PIB.