Memory riser placement and memory module balancing

Memory riser plugging sequence

Two configurations are available for the 8202-E4B, 8202-E4C, 8202-E4D, 8205-E6B, 8205-E6C, or 8205-E6D systems. When installing memory risers, follow this plugging sequence depending on the configuration.

Table 1. Memory riser plugging sequence for 8202-E4B, 8202-E4C, or 8202-E4D¹

Number of system processors	Plugging sequence
One system processor	Install the first memory riser at location P1-C18. Install the second memory riser at location P1-C17.
Note: 1 The 8202-E4B, 8202-E4C, and 8202-E4D are only available with one system processor.

Table 2. Memory riser plugging sequence for 8205-E6B, 8205-E6C, or 8205-E6D

Number of system processors	Plugging sequence
One system processor	Install the first memory riser at location P1-C18. Install the second memory riser at location P1-C17.
Two system processors (to balance memory on each system processor)	Install the first memory riser at location P1-C18. Install the second memory riser at location P1-C16. Install the third memory riser at location P1-C17. Install the fourth memory riser at location P1-C15.

Figure 1. Memory riser plugging sequence

This figure shows the two-system processor configuration of the 8205-E6B, 8205-E6C, and the 8205-E6D. The 8202-E4B, 8202-E4C, and the 8202-E4D are identical to this figure, but they include only the system processor that is associated with memory risers P1-C17 and P1-C18.

Memory module balancing for the 8202-E4B or 8205-E6B

Plug the memory modules into the slots shown in the following table and Figure 2.

Notes:

• The minimum memory that can be installed is 8 GB, or two 4 GB dual inline memory modules (DIMMs).
• Memory module quads installed on the same processor module or memory card can be of different sizes. For example, one quad of 4 GB DIMMs can be on the same memory riser as one quad of 8 GB DIMMs.
• Memory modules installed on different processor modules can be different sizes and speeds.
• Each memory feature consists of one pair of DIMMs. Each processor module can have two, four, eight, or 16 DIMMs. A memory feature is not required in all processor modules.
• When two processors are installed, alternate installing memory modules between memory cards on the first processor module and the second processor module.
• After the first pair of 4 GB memory modules, the memory modules must be installed as a quad.

Table 3. Memory module balancing for the 8202-E4B or 8205-E6B

Processors and memory	Where to install memory modules
One processor module and one memory card, or two processor modules and one memory card (8202-E4B or 8205-E6B)	Plug the first pair of memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10). Plug the second pair of memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9). Plug the next four memory modules into slot 1 (P1-C18-C1), slot 2 (P1-C18-C2), slot 3 (P1-C18-C3) and slot 4 (P1-C18-C4). Notes: If both pairs are installed, they are the first quad of memory modules. Memory modules at slots 5, 6, 7, and 8 must be identical. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8.
One processor module and two memory cards (8202-E4B or 8205-E6B)	Plug the first two memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10) on the first memory card. Plug the second pair of memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9) on the first memory card. Plug the next quad of memory modules into slot 5 (P1-C17-C7), slot 6 (P1-C17-C8), slot 7 (P1-C17-C9), and slot 8 (P1-C17-C10) on the second memory card. Plug the next quad of memory modules into slot 1 (P1-C18-C1), slot 2 (P1-C18-C2), slot 3 (P1-C18-C3), and slot 4 (P1-C18-C4) on the first memory card. Plug the next quad of memory modules into slot 1 (P1-C17-C1), slot 2 (P1-C17-C2), slot 3 (P1-C17-C3), and slot 4 (P1-C17-C4) on the second memory card. Notes: The first pair of memory modules must be two 4 GB memory modules. If quads are being installed, these locations can have 8 GB DIMMs installed. Memory modules at slots 5, 6, 7, and 8 on the first memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the second memory card must be identical. All memory modules on the first memory card can be different from the memory modules on the second card. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8 on the same memory card.
Two processor modules and two memory cards (8202-E4B or 8205-E6B)	Balance memory on each processor module: Plug the first two memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10) on the first memory card. Plug the second pair of memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9) on the first memory card. Plug the next quad of memory modules into slot 5 (P1-C16-C7), slot 6 (P1-C16-C8), slot 7 (P1-C16-C9), and slot 8 (P1-C16-C10) on the second memory card. Plug the next quad of memory modules into slot 1 (P1-C18-C1), slot 2 (P1-C18-C2), slot 3 (P1-C18-C3), and slot 4 (P1-C18-C4) on the first memory card. Plug the next quad of memory modules into slot 1 (P1-C16-C1), slot 2 (P1-C16-C2), slot 3 (P1-C16-C3), and slot 4 (P1-C16-C4) on the second memory card. Notes: The first pair of memory modules must be two 4 GB memory modules. If quads are being installed, these locations can have 8 GB DIMMs installed. Memory modules at slots 5, 6, 7, and 8 on the first memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the second memory card must be identical. All memory modules on the first memory card can be different from the memory modules on the second card. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8 on the same memory card.
Two processor modules and three memory cards (8205-E6B)	Balance memory on each processor module: Plug the first two memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10) on the first memory card. Plug the second pair of memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9) on the first memory card. Plug the next quad of memory modules into slot 5 (P1-C16-C7), slot 6 (P1-C16-C8), slot 7 (P1-C16-C9), and slot 8 (P1-C16-C10) on the second memory card. Plug the next quad of memory modules into slot 5 (P1-C17-C7), slot 6 (P1-C17-C8), slot 7 (P1-C17-C9), and slot 8 (P1-C17-C10) on the third memory card. Plug the next quad of memory modules into slot 1 (P1-C18-C1), slot 2 (P1-C18-C2), slot 3 (P1-C18-C3), and slot 4 (P1-C18-C4) on the first memory card. Plug the next quad of memory modules into slot 1 (P1-C16-C1), slot 2 (P1-C16-C2), slot 3 (P1-C16-C3), and slot 4 (P1-C16-C4) on the second memory card. Plug the next four memory modules at slot 1 (P1-C17-C1), slot 2 (P1-C17-C2), slot 3 (P1-C17-C3) and slot 4 (P1-C17-C4) on the third memory card. Notes: The first pair of memory modules must be two 4 GB memory modules. If quads are being installed, these locations can have 8 GB DIMMs installed. Memory modules at slots 5, 6, 7, and 8 on the first memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the second memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the third memory card must be identical; however, they can be different from the memory modules at slots 5, 6, 7, and 8 on the first and second memory cards. All memory modules on the first memory card can be different from the memory modules on the second card. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8 on the same memory card.
Two processor modules and four memory cards (8205-E6B)	Balance memory on each processor module: Plug the first quad of memory modules into slot 5 (P1-C18-C7), slot 6 (P1-C18-C8), slot 7 (P1-C18-C9), and slot 8 (P1-C18-C10) on the first memory card. Plug the second quad of memory modules into slot 5 (P1-C16-C7), slot 6 (P1-C16-C8), slot 7 (P1-C16-C9), and slot 8 (P1-C16-C10) on the second memory card. Plug the third quad of memory modules into slot 5 (P1-C17-C7), slot 6 (P1-C17-C8), slot 7 (P1-C17-C9), and slot 8 (P1-C17-C10) on the third memory card. Plug the fourth quad of memory modules into slot 5 (P1-C15-C7), slot 6 (P1-C15-C8), slot 7 (P1-C15-C9), and slot 8 (P1-C15-C10 on the fourth memory card. Plug the next quad of memory modules into slot 1 (P1-C18-C1), slot 2 (P1-C18-C2), slot 3 (P1-C18-C3), and slot 4 (P1-C18-C4) on the first memory card. Plug the next quad of memory modules into slot 1 (P1-C16-C1), slot 2 (P1-C16-C2), slot 3 (P1-C16-C3), and slot 4 (P1-C16-C4) on the second memory card. Plug the next quad of memory modules into slot 1 (P1-C17-C1), slot 2 (P1-C17-C2), slot 3 (P1-C17-C3), and slot 4 (P1-C17-C4) on the third memory card. Plug the next quad of memory modules into slot 1 (P1-C15-C1), slot 2 (P1-C15-C2), slot 3 (P1-C15-C3), and slot 4 (P1-C15-C4) on the fourth memory card. Notes: The first pair of memory modules must be two 4 GB memory modules. If quads are being installed, these locations can have 8 GB DIMMs installed. Memory modules at slots 5, 6, 7, and 8 on the second memory card must be identical; however, they can be different from the first quad of memory modules in slots 5, 6, 7, and 8 on the first memory card. Memory modules at slots 5, 6, 7, and 8 on the third memory card must be identical; however, they can be different from the memory modules at slots 5, 6, 7, and 8 on the first and second memory cards. Memory modules at slots 5, 6, 7, and 8 on the fourth memory card must be identical; however, they can be different from the memory modules at slots 5, 6, 7, and 8 on the first, second, and third memory cards.

Figure 2. Memory module slot locations for the 8202-E4B or 8205-E6B

Memory module balancing for the 8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D

Plug the memory modules into the slots shown in the following table and Figure 3.

Notes:

• Memory module quads installed on the same processor module or memory card can be of different sizes. For example, one quad of 4 GB DIMMs can be on the same memory riser as one quad of 8 GB DIMMs.
• Each DIMM within a DIMM pair must be equivalent and each DIMM within a DIMM quad must be equivalent.
• Each memory feature consists of one pair of DIMMs. Each processor module can have between 2 and 16 DIMMs, installed in pairs of two.
• When two processors are installed, alternate the installation of memory modules between memory cards on the first processor module and the second processor module.

Table 4. Memory module balancing for the 8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D

Processors and memory	Where to install memory modules
One processor module and one memory card, or two processor modules and one memory card (8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D)	Plug the first pair of memory modules into slot 1 (P1-C18-C1) and slot 3 (P1-C18-C3). Plug the second pair of memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10). Plug the next pair of memory modules into slot 2 (P1-C18-C2) and slot 4 (P1-C18-C4). Plug the next pair of memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9). Notes: Each DIMM within a DIMM pair must be equivalent. Memory modules at slots 5, 6, 7, and 8 must be identical. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8.
One processor module and two memory cards (8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D)	Plug the first two memory modules into slot 1 (P1-C18-C1) and slot 3 (P1-C18-C3) on the first memory card. Plug the second pair of memory modules into slot 1 (P1-C17-C1) and slot 3 (P1-C17-C3) on the second memory card. Plug the next pair of memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10) on the first memory card. Plug the next pair of memory modules into slot 6 (P1-C17-C8) and slot 8 (P1-C17-C10) on the second memory card. Plug the next pair of memory modules into slot 2 (P1-C18-C2) and slot 4 (P1-C18-C4) on the first memory card. Plug the next pair of memory modules into slot 2 (P1-C17-C2) and slot 4 (P1-C17-C4) on the second memory card. Plug the next pair of memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9) on the first memory card. Plug the next pair of memory modules into slot 5 (P1-C17-C7) and slot 7 (P1-C17-C9) on the second memory card. Notes: Memory modules at slots 5, 6, 7, and 8 on the first memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the second memory card must be identical. All memory modules on the first memory card can be different from the memory modules on the second card. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8 on the same memory card.
Two processor modules and two memory cards (8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D)	Balance memory on each processor module: Plug the first two memory modules into slot 1 (P1-C18-C1) and slot 3 (P1-C18-C3) on the first memory card. Plug the second pair of memory modules into slot 1 (P1-C16-C1) and slot 3 (P1-C16-C3) on the third memory card. Plug the next pair of memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10) on the first memory card. Plug the next pair of memory modules into slot 6 (P1-C16-C8) and slot 8 (P1-C16-C10) on the third memory card. Plug the next pair of memory modules into slot 2 (P1-C18-C2) and slot 4 (P1-C18-C4) on the first memory card. Plug the next pair of memory modules into slot 2 (P1-C16-C2) and slot 4 (P1-C16-C4) on the third memory card. Plug the next pair of memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9) on the first memory card. Plug the next pair of memory modules into slot 5 (P1-C16-C7) and slot 7 (P1-C16-C9) on the third memory card. Notes: Memory modules at slots 5, 6, 7, and 8 on the first memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the third memory card must be identical. All memory modules on the first memory card can be different from the memory modules on the third card. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8 on the same memory card.
Two processor modules and three memory cards (8205-E6C or 8205-E6D)	Balance memory on each processor module: Plug the first two memory modules into slot 1 (P1-C18-C1) and slot 3 (P1-C18-C3) on the first memory card. Plug the second pair of memory modules into slot 1 (P1-C16-C1) and slot 3 (P1-C16-C3) on the third memory card. Plug the next pair of memory modules into slot 1 (P1-C17-C1) and slot 3 (P1-C17-C3) on the second memory card. Plug the next two memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10) on the first memory card. Plug the next pair of memory modules into slot 6 (P1-C16-C8) and slot 8 (P1-C16-C10) on the third memory card. Plug the next pair of memory modules into slot 6 (P1-C17-C8) and slot 8 (P1-C17-C10) on the second memory card. Plug the next two memory modules into slot 2 (P1-C18-C2) and slot 4 (P1-C18-C4) on the first memory card. Plug the next pair of memory modules into slot 2 (P1-C16-C2) and slot 4 (P1-C16-C4) on the third memory card. Plug the next pair of memory modules into slot 2 (P1-C17-C2) and slot 4 (P1-C17-C4) on the second memory card. Plug the next two memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9) on the first memory card. Plug the next pair of memory modules into slot 5 (P1-C16-C7) and slot 7 (P1-C16-C9) on the third memory card. Plug the next pair of memory modules into slot 5 (P1-C17-C7) and slot 7 (P1-C17-C9) on the second memory card. Notes: Memory modules at slots 5, 6, 7, and 8 on the first memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the second memory card must be identical. Memory modules at slots 5, 6, 7, and 8 on the third memory card must be identical; however, they can be different from the memory modules at slots 5, 6, 7, and 8 on the first and second memory cards. All memory modules on the first memory card can be different from the memory modules on the second card. Memory modules at slots 1, 2, 3, and 4 must be identical; however, they can be different from the four memory modules at slots 5, 6, 7, and 8 on the same memory card.
Two processor modules and four memory cards (8205-E6C or 8205-E6D)	Balance memory on each processor module: Plug the first two memory modules into slot 1 (P1-C18-C1) and slot 3 (P1-C18-C3) on the first memory card. Plug the second pair of memory modules into slot 1 (P1-C16-C1) and slot 3 (P1-C16-C3) on the third memory card. Plug the next pair of memory modules into slot 1 (P1-C17-C1) and slot 3 (P1-C17-C3) on the second memory card. Plug the next pair of memory modules into slot 1 (P1-C15-C1) and slot 3 (P1-C15-C3) on the fourth memory card. Plug the next two memory modules into slot 6 (P1-C18-C8) and slot 8 (P1-C18-C10) on the first memory card. Plug the next pair of memory modules into slot 6 (P1-C16-C8) and slot 8 (P1-C16-C10) on the third memory card. Plug the next pair of memory modules into slot 6 (P1-C17-C8) and slot 8 (P1-C17-C10) on the second memory card. Plug the next pair of memory modules into slot 6 (P1-C15-C8) and slot 8 (P1-C15-C10) on the fourth memory card. Plug the next two memory modules into slot 2 (P1-C18-C2) and slot 4 (P1-C18-C4) on the first memory card. Plug the next pair of memory modules into slot 2 (P1-C16-C2) and slot 4 (P1-C16-C4) on the third memory card. Plug the next pair of memory modules into slot 2 (P1-C17-C2) and slot 4 (P1-C17-C4) on the second memory card. Plug the next pair of memory modules into slot 2 (P1-C15-C2) and slot 4 (P1-C15-C4) on the fourth memory card. Plug the next two memory modules into slot 5 (P1-C18-C7) and slot 7 (P1-C18-C9) on the first memory card. Plug the next pair of memory modules into slot 5 (P1-C16-C7) and slot 7 (P1-C16-C9) on the third memory card. Plug the next pair of memory modules into slot 5 (P1-C17-C7) and slot 7 (P1-C17-C9) on the second memory card. Plug the next pair of memory modules into slot 5 (P1-C15-C7) and slot 7 (P1-C15-C9) on the fourth memory card. Notes: Memory modules at slots 5, 6, 7, and 8 on the second memory card must be identical; however, they can be different from the first quad of memory modules in slots 5, 6, 7, and 8 on the first memory card. Memory modules at slots 5, 6, 7, and 8 on the third memory card must be identical; however, they can be different from the memory modules at slots 5, 6, 7, and 8 on the first and second memory cards. Memory modules at slots 5, 6, 7, and 8 on the fourth memory card must be identical; however, they can be different from the memory modules at slots 5, 6, 7, and 8 on the first, second, and third memory cards.

Figure 3. Memory module slot locations for the 8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D

Note: Because the voltage regulator modules (VRMs) are soldered to the riser card, connectors C5 and C6 are not available on the 8202-E4C, 8202-E4D, 8205-E6C, or 8205-E6D systems.