Dell Precision 7820 Tower

Compact dual-socket Xeon Scalable tower workstation (Intel C621): one or two CPUs with up to 28 cores each, 12 DIMM slots for up to 768 GB, two double-width GPUs (single CPU) and a 950 W PSU. The second CPU and its memory sit on a riser card.

Memory

Slots: 12 DIMM: 6 per CPU (six channels, 1 DIMM per channel); CPU1's 6 slots are on the second-CPU riser card
Type: DDR4 ECC RDIMM
Speeds: 2933 MT/s max running speed (Platinum 82xx/Gold 62xx); lower with other CPUs; 3200 MT/s DIMMs clock down
DIMM sizes: 32 GB (2666), 64 GB (2933/3200) per slot (owner's manual)
Maximum: 768 GB at 2933 MT/s with two CPUs (spec sheet)
Optane: Owner's manual: Intel Optane persistent memory (PMem) supported
Note: The owner's manual spec table (Rev. A10) says 6 slots and 256 GB (Skylake) / 512 GB (Cascade Lake) max and mentions Xeon W / Core X; that text appears to be carried over from the 5820 and conflicts with the spec sheet

Storage

FlexBays: 2 front FlexBays, each up to 2 × 3.5" or 2.5" drives (4 total); up to 6 × 2.5" or 5 × 3.5" with the 5.25" bay populated
5.25" FlexBay: Half-height optical (BD, DVD±RW) or 1 × 3.5" / 2 × 2.5" drives (factory or customer kit)
Slimline bay: DVD-ROM, DVD±RW or CAC/PIV card reader
Front NVMe: Up to 2 hot-plug M.2/U.2 NVMe in FlexBay 1 on the PCIe backplane chassis (Intel controller); up to 4 with the MegaRAID 9460 NVMe option; later spec sheet: up to 4 × 4 TB M.2 on PCIe-backplane FlexBays
M.2 add-in: Dell Precision Ultra-Speed Drive Quad (x16, FH/FL, 4 × M.2 NVMe) or Duo (x8, HH/HL, 2 × M.2)
Onboard SATA: Intel chipset SATA 6 Gb/s: 6 ports + 2 for 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); front FlexBay NVMe RAID 0/1
RAID cards: Broadcom MegaRAID SAS 9440-8i (RAID 0/1/5/10); MegaRAID SAS 9460-16i (4 GB cache, hardware RAID 0/1/5/10, NVMe option)
Total: Up to 60 TB (5 × 12 TB 3.5" SATA)

Graphics

Capacity: 2 × PCIe x16 Gen 3 graphics: up to 600 W, max 2 × 300 W double-width with one CPU (later spec sheet: 2 × 295 W); 2 × 160 W single-width with two CPUs
NVIDIA pro: Quadro P400, P600, P620, P1000, P2000, P2200, P4000, P5000, P6000, GP100, GV100, Quadro RTX 4000/5000/6000/8000, T400, T600, T1000, RTX A2000, A4000, A4500, A5000, A5500, A6000, NVS 310, NVS 315
NVIDIA GeForce: RTX 2080 B, RTX 3080, RTX 3090 (3080/3090 qualified in slots 2 and 4)
AMD: Radeon Pro WX 2100, WX 3100, WX 3200, WX 4100, WX 5100, WX 7100, WX 9100, Radeon Pro SSG, Radeon Pro W5700, W6400, W6600, W6800

Expansion

PCIe x16: 2 slots, PCIe Gen 3 x16 (graphics)
PCIe x16 (x8): 1 slot, x16 connector wired x8
PCIe x16 (x4): 1 slot, x16 connector wired x4
PCIe x16 (x1): 1 slot, x16 connector wired x1
PCI: 1 slot, PCI 32-bit/33 MHz
Notes: GeForce RTX 3080/3090 qualified in slots 2 and 4; Qualcomm WCN6856 Wi-Fi card must go in slot 5; BIOS primary-video list: slots 1, 2, 3, 5, 6 and SLOT7_CPU1

Networking

Onboard: Intel i219 Gigabit Ethernet (1 × RJ45), Remote Wake-Up, PXE, jumbo frames
Optional: Intel i210 1 GbE, Intel X550-T2 dual 10GbE (x4), Aquantia AQN-108 2.5/5GbE (x4), 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: 950 W, 100-240 VAC
Efficiency: 90% (80 PLUS Gold)
Access: Externally accessible, removable, lockable; PSU LED and BIST button

Ports

Front: 2 × USB 3.1 Gen 1 Type-A, 2 × USB 3.1 Gen 1 Type-C (one with PowerShare / DP power delivery), universal audio jack, SD slot (UHS-II, read-only)
Rear: 6 × USB 3.1 Gen 1 Type-A (one with DP/power delivery, smart power-on), serial, RJ45, 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 speaker

Physical

Dimensions (H×W×D): 417.9 × 176.5 × 518.2 mm (16.45 × 6.95 × 20.4 in); owner's manual gives 518.3 mm depth
Weight: Starting at 15.4 kg (34 lb)
Rack: Optional 19" rackmount rail kit
Operating temp: 5-35 °C

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, lockable PSU and front bezel, key-lock drive sleds, Kensington slot, padlock ring, optional CAC/PIV reader

Operating systems

Windows: Windows 10 Pro for Workstations; later spec sheet adds Windows 11 Pro for Workstations
Linux: Red Hat Enterprise Linux 7.5 and 8.0 (8.0 required for Cascade Lake CPUs), Ubuntu 16.04 / 18.04 / 20.04
China: NeoKylin 6.0 SP3 / SP5, select 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 8276
Intel Xeon Platinum 8270
Intel Xeon Platinum 8268
Intel Xeon Platinum 8260
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 6238
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 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 8168
Intel Xeon Platinum 8160
Intel Xeon Gold 6154
Intel Xeon Gold 6152
Intel Xeon Gold 6146
Intel Xeon Gold 6144
Intel Xeon Gold 6140
Intel Xeon Gold 6138
Intel Xeon Gold 6136
Intel Xeon Gold 6134
Intel Xeon Gold 6130
Intel Xeon Gold 6128
Intel Xeon Gold 5122
Intel Xeon Gold 5120
Intel Xeon Silver 4116
Intel Xeon Silver 4114
Intel Xeon Silver 4112
Intel Xeon Silver 4110
Intel Xeon Bronze 3106
Intel Xeon Bronze 3104