Dell Precision Tower 3420 upgrades
Optional extras: a Dell Precision Ultra-Speed Drive PCIe card (x8, up to 1 TB) adds a second NVMe SSD but uses a PCIe slot. An optional internal SD card reader is also available. Confirm 3420-specific rows, as the tech guide is shared with the 3620.
- DIMM slots (DDR4 UDIMM): 4 × DDR4 DIMM · up to 64 GB total · 2400 MT/s
- M.2 PCIe SSD slot (2280): SSD M.2 2280 (NVMe) · up to 1 TB
- Internal 3.5" drive bay: HDD 3.5" (SATA) · up to 4 TB
- 2.5" drives in internal bay (2 per bay): 2 × HDD / SSD 2.5" (SATA) · up to 1 TB
DIMM slots (DDR4 UDIMM) 4 × DDR4 DIMM · up to 64 GB total · 2400 MT/s
Desktop UDIMM only, no RDIMM or SO-DIMM. ECC UDIMM works only with Xeon CPUs, and ECC and non-ECC cannot be mixed. 2400 MHz needs a 7th-gen Intel CPU; otherwise it runs at 2133. Fill both channels for best performance.
| $/GB | Price | Capacity | Product | Condition | Store | Link |
|---|---|---|---|---|---|---|
| $4.69 | $75.00 | 2 × 8 GB | Corsair Vengeance LPX 16GB Kit (2 × 8GB) DDR4-3200 CL16 runs at 2400 MT/s DDR4-3200 CL16 DIMM | Used | eBay US +2 | View deal |
| $4.69 | $150.00 | 2 × 16 GB | Corsair Vengeance LPX 32GB Kit (2 × 16GB) DDR4-3200 CL16 runs at 2400 MT/s DDR4-3200 CL16 DIMM | Used | eBay US +2 | View deal |
| $6.22 | $199.00 | 2 × 16 GB | Corsair Vengeance LPX 32GB Kit (2 × 16GB) DDR4-3200 CL16 runs at 2400 MT/s DDR4-3200 CL16 DIMM | New | eBay US +2 | View deal |
| $6.25 | $99.99 | 2 × 8 GB | Corsair Vengeance LPX 16GB Kit (2 × 8GB) DDR4-3200 CL16 runs at 2400 MT/s DDR4-3200 CL16 DIMM | New | eBay US | View deal |
M.2 PCIe SSD slot (2280) SSD M.2 2280 (NVMe) · up to 1 TB
PCIe Gen3 x4 slot on the motherboard. The board labels it 'SATA or PCIe SSD Slot', but the sources don't confirm SATA M.2 support. Dell lists up to 1 TB.
| $/TB | Price | Capacity | Product | Condition | Store | Link |
|---|---|---|---|---|---|---|
| $120.00 | $120.00 | 1 TB | Crucial P3 1TB M.2 2280 NVMe (Gen3) M.2 2280 SSD · NVMe Gen3 | Used | eBay US +1 | View deal |
| $127.99 | $127.99 | 1 TB | Kingston NV3 1TB M.2 2280 NVMe M.2 2280 SSD · NVMe Gen4 | Used | eBay US +2 | View deal |
| $129.99 | $129.99 | 1 TB | Crucial P3 1TB M.2 2280 NVMe (Gen3) M.2 2280 SSD · NVMe Gen3 | New | eBay US +2 | View deal |
| $148.00 | $148.00 | 1 TB | Samsung 970 EVO Plus 1TB M.2 2280 NVMe M.2 2280 SSD · NVMe Gen3 | Used | eBay US +2 | View deal |
| $150.00 | $150.00 | 1 TB | Samsung 990 PRO 1TB M.2 2280 NVMe M.2 2280 SSD · NVMe Gen4 | Used | eBay US +2 | View deal |
| $159.99 | $159.99 | 1 TB | Kingston NV3 1TB M.2 2280 NVMe M.2 2280 SSD · NVMe Gen4 | New | eBay US +2 | View deal |
| $197.86 | $197.86 | 1 TB | Samsung 970 EVO Plus 1TB M.2 2280 NVMe M.2 2280 SSD · NVMe Gen3 | New | eBay US +2 | View deal |
| $209.99 | $209.99 | 1 TB | Samsung 990 PRO 1TB M.2 2280 NVMe M.2 2280 SSD · NVMe Gen4 | New | eBay US +2 | View deal |
Internal 3.5" drive bay HDD 3.5" (SATA) · up to 4 TB
Dell lists 3.5" HDDs up to 4 TB at 5400 RPM or 2 TB at 7200 RPM. This bay holds one 3.5" drive or two 2.5" drives. The tech guide mixes in 3620 data, so check bay counts before buying a caddy.
2.5" drives in internal bay (2 per bay) 2 × HDD / SSD 2.5" (SATA) · up to 1 TB
Shares the single internal 3.5" bay and needs a bracket or adapter. Dell lists 2.5" SSDs up to 512 GB and 7200 RPM HDDs up to 1 TB; larger drives may work but aren't listed. Thickness limit not given. Three SATA ports on the board.