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Dell Precision 7920 Rack Owner's Manual

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Expansion card installation guidelines

Depending on your system configuration, the following PCI Express (PCIe) generation 3 expansion cards are supported:

Table 1. Expansion card riser specificationsThis table provides information about the expansion card riser configuration for Prec
Expansion card riserPCIe slots on the riserProcessor connectionHeightLengthLinkSlot width
Riser 1CSlot 1Processor 1Full HeightFull Lengthx16x16
Riser 1CSlot 2Processor 1Full HeightFull Lengthx8x16
Riser 1CSlot 3Processor 1Full HeightHalf Lengthx8x16
Riser 2ASlot 4Processor 2Full HeightFull Lengthx16x16
Riser 2ASlot 5Processor 2Full HeightFull Lengthx8x16
Riser 2ASlot 6Processor 1Low ProfileHalf Lengthx8x16
Riser 3ASlot 7Processor 2Full HeightFull Lengthx8x16
Riser 3ASlot 8Processor 2Full HeightFull Lengthx16x16
NOTE:The expansion card slots are not hot-swappable.

The following table provides guidelines for installing expansion cards to ensure proper cooling and mechanical fit. The expansion cards with the highest priority should be installed first using the slot priority indicated. All the other expansion cards should be installed in the card priority and slot priority order.

Table 2. No riser configurationsThe table below describes the No riser configurations
Card Type Slot priority Maximum number of cards
NDC NDC Slot1
PERC 3, 1, 21
GFX/GPU Compute (DW)1,4,83
GFX (FH/SW)1,4,8,2,5,7up to 6
GFX (LP)61
PCIe SSD (LP) - Zoom 261
PCIe SSD (FH) - Zoom 21,2,3,4,5,7,81
PCIe SSD (FH) - Zoom 41,4,82 (*See Note 7)
Teradici (P25) (LP)61
Teradici (P25 or P45) (FH)1,2,4,5,7,8 2
Serial (FH)1,2,4,5,7,8 1
Serial (LP)61
Audio (FH)1,2,4,5,7,8 1
Audio (LP)61

Memory installtion

NOTE:
  1. Cards should be installed in the system, starting with the Card priority, then the slot priority. The first open slot priority should be used.
  2. Low profile (LP), Half-Height cards can only be installed in Slot 6.
  3. Slots 4, 5, 7, 8 require that CPU2 be installed in the system.
  4. Any cards > 75W require one or more external power cables to be installed (power cables are included in base system BOM).
  5. Graphics cards are of equal priority to each other. For multiple GPU card configs, cards must be matched (all same model).
  6. nVIdia GPU's using SLI must reside in slots 4 and 7 with a 2nd CPU installed. An SLI cable must also be installed.
  7. Zoom4 - Dual Zoom4 requires dual CPU, and both Zoom cards must be populated on CPU2 (slots 4 & 8)
  8. No Teradici P25 or P45 in slot 3

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