Dell Precision 7920 Tower
Dell's biggest dual-socket Xeon Scalable tower workstation (Intel C621): up to two 28-core CPUs, 24 DIMM slots for up to 3 TB, up to three 300 W GPUs and up to 10 drives with front and rear FlexBays, on a 1400 W PSU. Aimed at simulation, rendering, AI and other heavy multi-threaded work.
Memory
- Slots
- 24 DIMM (12 per CPU), 6 channels per CPU; CPU1's 12 slots need the second CPU
- Type
- DDR4 ECC RDIMM and LRDIMM
- DIMM sizes
- 8, 16, 32, 64 GB RDIMM; 128 GB LRDIMM (guidebook); owner's manual: 128 GB per slot at 2666/3200, 64 GB at 2933
- Speeds
- 2666 MT/s (dropped on configs bought after Oct 2020), 2933, 3200 MT/s modules; max running speed 2933 MT/s. Skylake CPUs run 2933 DIMMs at 2666; Cascade Lake runs 3200 DIMMs at 2933 or lower by CPU
- Minimum
- 8 GB (1 × 8 GB)
- Maximum
- 3072 GB with 2666/3200 MT/s LRDIMMs (two 'L' CPUs); 768 GB with 2933 MT/s memory; spec sheet: up to 1.5 TB 2666 MHz with dual CPUs, 3 TB with select CPUs
- Per-CPU limit
- Standard Cascade Lake CPUs 1 TB per CPU; 'M'/'L' CPUs 1.5 TB per CPU; standard Skylake CPUs 768 GB per CPU
- Optane DCPMM
- 128/256/512 GB modules at 2666 MT/s, Memory Mode only (not persistent), RDIMMs act as cache; up to 1.5 TB with 1 CPU, up to 6 TB with 2 CPUs (L SKUs)
Storage
- Front FlexBays 0-1
- Each holds 2 × 2.5"/3.5" SATA/SAS drives (4 total), or with the optional PCIe backplane up to 4 hot-swap M.2 (carrier) or U.2 NVMe SSDs; FlexBay 1 takes the 1st and 2nd NVMe drives
- FlexBay 2 (5.25")
- Half-height optical (BD-RE, DVD±RW) or the 9th/10th SATA/SAS drives with MegaRAID 9460-16i (slimline bay is then unavailable)
- Rear FlexBays 3-4
- Optional; SATA/SAS drives 5-8 only
- Slimline bay
- Slim DVD-ROM, DVD±RW or CAC/PIV smart card reader
- Maximum drives
- 8 × 2.5"/3.5" SATA with the Intel controller; 10 × SATA/SAS with MegaRAID 9460-16i
- Front NVMe
- Up to 4 M.2/U.2 NVMe with the Intel controller (more than 2 needs two CPUs), or up to 4 with the MegaRAID 9460 NVMe option (one or two CPUs); Intel Optane 905P U.2 supported
- M.2 add-in
- Dell Precision Ultra-Speed Drive Quad (x16, FH/FL, 4 × M.2) or Duo (x8, HH/HL, 2 × M.2); up to 8 M.2 NVMe on two Quad cards with two CPUs
- Onboard SATA
- Intel chipset SATA 6 Gb/s: 8 ports + 1 optical; Intel RSTe RAID 0/1/5/10
- NVMe RAID
- Intel RSTe/vROC RAID 0/1/10 with the motherboard activation key (vROC_key header); RAID 0/10 can span two Quad cards but not as the boot drive
- RAID cards
- Broadcom MegaRAID SAS 9440-8i (8 ports, RAID 0/1/5/10); MegaRAID SAS 9460-16i (4 GB cache, CacheVault, hardware RAID 0/1/5/10, NVMe option)
- Total
- Spec sheet: up to 136 TB total storage in front and rear FlexBays
Graphics
- Capacity
- 4 × PCIe x16 Gen 3 graphics slots (2 need the second CPU); up to 900 W total: 3 × 300 W double-width with dual CPUs, or up to 2 × 375 W cards; up to 4 single-wide or 3 double-wide cards
- NVIDIA pro
- Quadro P400, P600, P620, P1000, P2000, P2200, P4000, P5000, P6000, GP100, GV100, Quadro RTX 4000, RTX 5000, RTX 6000, RTX 8000, NVS 310, NVS 315
- NVIDIA GeForce
- RTX 2080 B, RTX 3080, RTX 3090 (3080/3090: max 1 card, slot 2)
- AMD
- Radeon Pro WX 2100, WX 3100, WX 3200, WX 4100, WX 5100, WX 7100, WX 9100, Radeon Pro SSG, Radeon Pro W5500, W5700
- Aux power
- Ships with 3 × 6+2-pin aux graphics connectors (3rd at the top for the CPU1 slots); up to 6 factory-configured; 900 W needs the upgraded 'CL' chassis with 8 A aux cabling
Expansion
- Slot 1
- PCIe Gen 3 x8, open-ended, full height/full length, 25 W (storage, Ultra-Speed Duo, PCoIP host)
- Slot 2
- PCIe Gen 3 x16, 300 W; default slot for the factory graphics card
- Slot 3
- PCIe Gen 3 x16 connector wired x1, 25 W
- Slot 4
- PCIe Gen 3 x16, 300 W; second graphics card
- Slot 5
- PCIe Gen 3 x16 connector wired x4, 25 W (required slot for the Qualcomm WCN6856 Wi-Fi/Bluetooth card)
- Mechanical
- Mechanical-only slot position (one below slot 5, one in the CPU1 area); no PCI slot
- Slot 6
- PCIe Gen 3 x16, 300 W; needs the second CPU
- Slot 7
- PCIe Gen 3 x16, 75 W; needs the second CPU
- All slots
- Full height, full length (up to 31.2 cm)
Networking
- Onboard
- Intel i219 (AMT-capable port) and Intel i210 Gigabit Ethernet, 2 × RJ45; Remote Wake-Up, PXE, jumbo frames
- Optional
- Intel i210-T1 1 GbE (x1), Intel X550-T2 dual 10GbE (x4), Aquantia AQN-108 2.5/5GbE, Intel X710-T2L dual 10GbE (x8), Intel Dual Band Wireless AC 8265 + Bluetooth, Qualcomm WCN6856 Wi-Fi (slot 5)
- Note
- Wake-on-LAN not supported on X550-T2 or X710-T2L cards
Power
- PSU
- 1400 W at 181-240 VAC; 1100 W at 100-180 VAC (guidebook: 1100 W at 108-180 VAC, 1000 W at 100-107 VAC)
- Efficiency
- 80 PLUS Gold, 87/90/87% at 20/50/100% load; active PFC, single 12 V rail
- Input
- 100-240 VAC, 15.0 A / 8.0 A, 50/60 Hz
- Access
- Externally accessible, removable, lockable
- High-power GPU
- 220 V input required for 750-900 W graphics configs (e.g. 3 × RTX 5000/6000/8000) in 100-120 V countries
Ports
- Front
- 2 × USB 3.2 Gen 1 Type-A, 2 × USB 3.2 Gen 1 Type-C (one with PowerShare/DP/power delivery), universal audio jack, SD card slot (UHS-II, read-only)
- Rear
- 6 × USB 3.2 Gen 1 Type-A (one with DP/power delivery), 2 × RJ45, serial, PS/2 keyboard and mouse, line-out, line-in/mic
- Internal
- 1 × USB 2.0 Type-A, 1 × 2×5 USB 2.0 header (needs splitter cable)
- Optional cards
- USB 3.1 Gen 2 Type-C card (2 ports + DP in), Thunderbolt 3 card (2 ports + DP in), serial card, Teradici PCoIP dual/quad host cards
- Audio
- Realtek ALC3234 HD audio (2 channel), internal 2 W speaker
Physical
- Dimensions (H×W×D)
- 433 × 218 × 566 mm (17.05 × 8.58 × 22.29 in); 50.1 L
- Weight
- 20.4 kg minimum, 24.3 kg typical, 33.1 kg maximum configuration
- Shipping
- 29.48 kg; carton 616 × 362 × 743 mm
- Rack
- Optional 19" rackmount rail kit
- Operating temp
- 5-35 °C (owner's manual); 10-35 °C (guidebook)
- Clearance
- 10.2 cm on vented sides in an enclosure; 5.1 cm from the rear to a wall
Management
- Out-of-band
- Intel vPro/AMT with DASH, Intel Standard Manageability, or no OOB; chosen at purchase and not upgradeable later
- Tools
- Dell Command Suite, OMCI (SNMP/CIM), Dell vPro Enhancements
- Security
- TPM 2.0, chassis intrusion switch with AC power interlock, lockable PSU, lockable front and rear FlexBay bezels, key-lock drive sleds, Kensington slot, padlock loop, optional CAC/PIV reader
Operating systems
- Windows
- Windows 10 Pro for Workstations; Windows 7 Professional 64-bit (EOL)
- Linux
- Red Hat Enterprise Linux 7.5 and 8.0 (8.0 required for Cascade Lake CPUs), Ubuntu 16.04 / 18.04
- China
- NeoKylin (6.0 SP3 per spec sheet, 6.5 per guidebook), limited options
Processors
- Intel Xeon Gold 6258R
- Intel Xeon Gold 6256
- Intel Xeon Gold 6250
- Intel Xeon Gold 6248R
- Intel Xeon Gold 6246R
- Intel Xeon Gold 6242R
- Intel Xeon Gold 6240R
- Intel Xeon Gold 6238R
- Intel Xeon Gold 6230R
- Intel Xeon Gold 6226R
- Intel Xeon Gold 5220R
- Intel Xeon Gold 5218R
- Intel Xeon Silver 4215R
- Intel Xeon Silver 4214R
- Intel Xeon Silver 4210R
- Intel Xeon Bronze 3206R
- Intel Xeon Platinum 8280
- Intel Xeon Platinum 8280M
- Intel Xeon Platinum 8280L
- Intel Xeon Platinum 8276
- Intel Xeon Platinum 8276M
- Intel Xeon Platinum 8270
- Intel Xeon Platinum 8268
- Intel Xeon Platinum 8260
- Intel Xeon Platinum 8260M
- Intel Xeon Platinum 8260L
- Intel Xeon Platinum 8256
- Intel Xeon Platinum 8253
- Intel Xeon Gold 6254
- Intel Xeon Gold 6252
- Intel Xeon Gold 6248
- Intel Xeon Gold 6244
- Intel Xeon Gold 6242
- Intel Xeon Gold 6240
- Intel Xeon Gold 6240M
- Intel Xeon Gold 6238
- Intel Xeon Gold 6238M
- Intel Xeon Gold 6234
- Intel Xeon Gold 6230
- Intel Xeon Gold 6226
- Intel Xeon Gold 5222
- Intel Xeon Gold 5220
- Intel Xeon Gold 5218
- Intel Xeon Gold 5217
- Intel Xeon Gold 5215
- Intel Xeon Gold 5215M
- Intel Xeon Gold 5215L
- Intel Xeon Silver 4216
- Intel Xeon Silver 4215
- Intel Xeon Silver 4214
- Intel Xeon Silver 4210
- Intel Xeon Silver 4208
- Intel Xeon Bronze 3204
- Intel Xeon Platinum 8180
- Intel Xeon Platinum 8180M
- Intel Xeon Platinum 8168
- Intel Xeon Platinum 8160
- Intel Xeon Platinum 8160M
- Intel Xeon Gold 6154
- Intel Xeon Gold 6152
- Intel Xeon Gold 6148
- Intel Xeon Gold 6146
- Intel Xeon Gold 6144
- Intel Xeon Gold 6140
- Intel Xeon Gold 6140M
- Intel Xeon Gold 6138
- Intel Xeon Gold 6136
- Intel Xeon Gold 6134
- Intel Xeon Gold 6134M
- Intel Xeon Gold 6130
- Intel Xeon Gold 6128
- Intel Xeon Gold 6126
- Intel Xeon Gold 5122
- Intel Xeon Gold 5120
- Intel Xeon Gold 5118
- Intel Xeon Silver 4116
- Intel Xeon Silver 4114
- Intel Xeon Silver 4112
- Intel Xeon Silver 4110
- Intel Xeon Bronze 3106
- Intel Xeon Bronze 3104