Dell PowerEdge T340 Upgrade Guide: RAM and Storage

Updated Oct. 7, 2026 · Written from this device's verified specifications

This guide covers memory and storage upgrades for the Dell PowerEdge T340 tower server. The short answer: it takes up to 64 GB of unbuffered ECC DDR4 (4 x 16 GB) and up to eight 3.5-inch hot-plug SATA/SAS drives, depending on how your unit was configured.

At a glance

  • RAM: 4 DDR4 UDIMM slots, unbuffered ECC only, 8 or 16 GB modules, 64 GB maximum
  • Memory speed tops out at 2666 MT/s; faster modules run at 2666
  • Storage: up to 8 front hot-plug bays for SATA, Nearline SAS or SAS drives; no NVMe listed
  • Some units have only 4 bays, and software RAID (S140) on an x8 backplane limits you to 4 drives
  • Dell's documents list no CPU upgrade slot details for this model, so there is no CPU section here
DDR4 UDIMM slots4 × DDR4 DIMM · up to 64 GB total · 2666 MT/s · ECC
Front hot-plug drive bays (3.5")8 × HDD / SSD 3.5" / 2.5" (SATA / SAS) · up to 14 TB
Internal Dual SD Module (microSD)2 × Flash card microSD (SD (UHS)) · up to 64 GB
4 × DIMM · DDR4up to 64 GB totalFront hot-plug drive bays (3.5")8 × HDD / SSD 3.5" / 2.5" (SATA / SAS) · up to 14 TBInternal Dual SD Module (microSD)2 × Flash card microSD (SD (UHS)) · up to 64 GB
Schematic of the upgradeable slots (not to scale). Check the owner's manual for their exact positions.

Lifecycle and support

No longer sold new. Supported until Dec. 31, 2028 (estimate).

2023202420252026202720282029TodayEnd of sale · Oct. 31, 2023EOSL · Dec. 31, 2028
Filled dots: dates published by the manufacturer. Hollow dots: estimates from third-party sources.
MilestoneDateSource
End of sale
No longer sold new by the manufacturer (Dell calls this 'End of Life', Lenovo 'Withdrawn').		 Oct. 31, 2023 Estimate Estimate
Third-party date from ICD, a parts reseller. Dell calls this milestone 'End of Life'. Dell has not published it.
End of standard support (EOSL)
Standard warranty and support contracts can no longer be renewed.		 Dec. 31, 2028 Estimate Estimate
Third-party EOSL date from ICD, which says vendor support runs until December 2028. Dell ties support to each unit's service tag and publishes no model-wide date.

Dates not listed haven't been published by the manufacturer or a reliable third party.

RAM: 4 slots, up to 64 GB of unbuffered ECC

The T340 has 4 full-size DDR4 DIMM slots (not SO-DIMM), arranged as 2 channels with up to 2 DIMMs per channel. It needs unbuffered ECC modules (UDIMM, 1.2 V). Supported capacities are 8 GB and 16 GB, single or dual rank. The minimum is one 8 GB DIMM, and the maximum is 64 GB using four 16 GB modules. Dell's UK table caps 8 GB configurations at 32 GB total.

The top speed is 2666 MT/s with 1 or 2 DIMMs per channel. Dell notes that 3200 MT/s UDIMMs are accepted from BIOS 2.5.1 but run at 2666 MT/s, so they gain you nothing. The system runs all memory at the speed of the slowest channel configuration, and the CPU and BIOS setting can limit it too.

Some Dell pages say the server takes registered ECC memory. Those same pages also say UDIMM, and Dell's tech guide and memory tables list unbuffered ECC only, so the registered wording looks like an error. The tech guide also lists older 2400 and 2133 MT/s entries, including 4 GB modules. Treat those as legacy entries and stick with 8 or 16 GB.

Buying tips

  • Buy unbuffered ECC DDR4 UDIMMs only; avoid registered (RDIMM) and non-ECC modules.
  • Choose 16 GB modules and fill all 4 slots for the full 64 GB.
  • Match module specs across the slots, since the system runs at the slowest channel's speed.
  • Don't pay extra for 3200 MT/s modules; they run at 2666 MT/s here.
  • Memory off-lining isn't supported, so don't count on it as a reliability feature.

Storage: front hot-plug bays, plus optional boot modules

The front has up to 8 hot-plug bays for 3.5-inch drives. Supported types are SATA, Nearline SAS, SAS and SSD, at 6 or 12 Gbps. Dell lists hard drives from 300 GB up to 14 TB and SSDs from 240 GB up to 7.68 TB, with a maximum internal storage of 112 TB (8 hard drives). The drives are SATA/SAS only; no NVMe bays are listed.

The bay count and RAID choice matter. Some configurations have only 4 bays, so check the backplane in your unit. An x8 backplane ordered with PERC S140 software RAID supports only 4 drives, and the other slots are covered by a blank and can't be upgraded. 2.5-inch drives need a 3.5-inch hybrid carrier. Dell's documents disagree on whether SSDs are supported in that carrier: the tech guide lists 2.5-inch SATA and SAS SSDs, while Dell's Australia page says hybrid-carrier drives are hard drives only. Confirm before buying 2.5-inch SSDs.

For boot storage there are two optional modules. The Internal Dual SD Module takes two microSD cards (8, 16, 32 or 64 GB) mirrored as RAID 1, and it also works with one card but with no redundancy. The BOSS card holds one or two 240 GB M.2 modules, uses a PCIe slot and is not hot-plug. Dell's documents don't give its M.2 length, interface or PCIe generation. The tech guide also lists three 5.25-inch bays but doesn't say which configurations include them, so check your own unit.

Buying tips

  • Check your backplane and RAID option first; S140 software RAID on an x8 backplane means 4 drives, not 8.
  • Buy SATA or SAS drives only; NVMe drives won't fit the front bays.
  • If you want a 2.5-inch SSD, ask the seller whether it works in the T340 hybrid carrier, since Dell's documents disagree.
  • For SD boot, buy a matched pair of microSD cards (8 to 64 GB) so the mirror works.

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How to upgrade

Before you start

  • Back up all important data, and note your RAID configuration before changing drives.
  • Check your unit's configuration: number of bays, backplane, RAID controller and whether it has the SD or BOSS module.
  • Consider updating the BIOS and firmware first, especially before fitting newer memory modules (3200 MT/s modules need BIOS 2.5.1 or later).
  • Have your owner's manual to hand for exact disassembly and slot population instructions.
  • Use an anti-static wrist strap or touch bare metal on the chassis before handling parts.

Steps

  1. Back up and plan
    Back up your data and confirm the part you bought matches the limits in this guide: unbuffered ECC DDR4 for memory, SATA or SAS for the drive bays.
  2. Power off and unplug
    Shut the server down from the operating system, switch it off and unplug the power cable and any other cables. Wait a moment for it to settle.
  3. Ground yourself
    Work on a clean, flat surface and touch bare metal on the chassis or wear an anti-static strap before touching components.
  4. Open the case
    Open the server following the instructions in the owner's manual. Hold modules and drives by their edges and avoid touching contacts.
  5. Install the part
    For memory, follow the manual's guidance on which slots to fill first and seat each module fully. For a drive, fit it in its carrier and slide it into a free front bay. Front drives are hot-plug, but powering down is the safer default for a general upgrade. For SD or BOSS modules, follow the manual.
  6. Close up and reconnect
    Refit the cover, reconnect the cables and power the server on.
  7. Check that the system sees it
    Enter the BIOS or system setup, or check the management interface, to confirm the new memory total or drive appears. For drives on a RAID controller, you may need to create or rebuild a virtual disk. If something is missing, power down and reseat the part.

Good to know

  • Dell's documents disagree on registered versus unbuffered memory; this guide follows the tech guide and memory tables, which list unbuffered ECC UDIMMs only.
  • Dell's documents disagree on whether 2.5-inch SSDs are supported in the hybrid carrier, and on whether every unit has 8 bays or only 4. Check your own configuration.
  • Dell's documents don't give CPU upgrade details for this server, so we can't confirm which processors you could swap in. Check Dell's spec sheet and manual before buying one.
  • The BOSS card's M.2 length, interface and PCIe generation aren't given in Dell's documents.
  • Dell doesn't say which configurations include the three 5.25-inch bays.
  • This guide gives a general outline only. Follow the owner's manual for exact disassembly and slot population.

Frequently asked questions

How much RAM can the Dell PowerEdge T340 take?

Up to 64 GB, using four 16 GB unbuffered ECC DDR4 UDIMMs. With 8 GB modules the maximum is 32 GB. The minimum is one 8 GB module.

Does the T340 use registered or unbuffered memory?

Unbuffered ECC (UDIMM). A few Dell pages mention registered ECC, but Dell's tech guide and memory tables list UDIMM only, so buy unbuffered ECC modules.

Can I use 3200 MT/s memory in the T340?

Dell says 3200 MT/s UDIMMs are accepted from BIOS 2.5.1, but they run at 2666 MT/s, the server's maximum memory speed.

Does the T340 support SSDs, and how big can they be?

Yes. Dell lists SATA and SAS SSDs from 240 GB up to 7.68 TB in the front hot-plug bays. Hard drives go up to 14 TB. Whether SSDs work in the 2.5-inch hybrid carrier is something Dell's documents disagree on.

Does the T340 support NVMe drives?

No NVMe drive bays are listed. The front bays are SATA and SAS only.

How many drives can the T340 hold?

Up to 8 x 3.5-inch hot-plug drives, but some configurations have only 4 bays, and an x8 backplane with S140 software RAID supports only 4 drives. Check your unit's backplane.

Official documents and references

This guide was written with AI assistance from the compatibility data PartsPrices verified against the manufacturer's documents. Always check your exact model and the owner's manual before buying or opening your computer.