Dell OptiPlex 3080 SFF Upgrade Guide: RAM, SSD and CPU

Updated Oct. 9, 2026 · Written from this device's verified specifications

This guide covers the memory, storage and processor upgrades the Dell OptiPlex 3080 Small Form Factor (SFF) supports. The short answer: up to 64 GB of DDR4 in two slots, one NVMe M.2 SSD plus one SATA drive, and any supported 10th-gen Core i3/i5, Pentium or Celeron up to 65 W.

At a glance

  • RAM: 2 DDR4 DIMM slots, up to 32 GB each and 64 GB total, running at up to 2666 MT/s.
  • Storage: one PCIe Gen 3 x4 NVMe M.2 slot (up to 1 TB for 2280) plus one SATA bay for a 3.5" or 2.5" drive, not both.
  • CPU: 10th-gen only, up to 65 W. The fastest Dell-listed option is the Core i5-10600.
  • Update the BIOS before swapping the CPU, especially for the i3-10105, i3-10305 and i5-10505.
  • Expansion cards must be half-height.
DDR4 DIMM slots2 × DDR4 DIMM · up to 64 GB total · 2666 MT/s
M.2 slot for SSD (PCIe NVMe)SSD M.2 2230 / M.2 2280 (NVMe) · up to 1 TB
SATA bay for 3.5" or 2.5" driveHDD / SSD 3.5" / 2.5" (SATA) · up to 4 TB
LGA1200 CPU socketLGA1200 · Core 10th gen · max 65 W
CPU · LGA1200max 65 W2 × DIMM · DDR4up to 64 GB totalM.2 slot for SSD (PCIe NVMe)SSD M.2 2230 / M.2 2280 (NVMe) ·up to 1 TBSATA bay for 3.5" or 2.5" driveHDD / SSD 3.5" / 2.5" (SATA) ·up to 4 TB
Schematic of the upgradeable slots (not to scale). Check the owner's manual for their exact positions.

Lifecycle and support

A current model: sold new and supported.

20202021202220232024202520262027Today11 · Release · 2020
Filled dots: dates published by the manufacturer. Hollow dots: estimates from third-party sources.
MilestoneDate
Release
First available to buy.		 2020 Estimate Third-party list places the OptiPlex 3080 MT, SFF and Micro under 2020; exact day not confirmed. Dell's setup guide is dated May 2020 (Rev. A00), which suggests a mid-2020 launch.
Source ↗

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

RAM: two DDR4 slots, up to 64 GB

The OptiPlex 3080 SFF has two DDR4 memory slots. Dell lists modules of 4, 8, 16 or 32 GB, with a 4 GB minimum and a 64 GB maximum in total. Listed combinations are 1x4, 1x8, 2x4, 1x16, 2x8, 1x32, 2x16 and 2x32 GB. A 64-bit operating system can use the full range.

Speed is capped at 2666 MT/s, so faster modules will work no quicker than that. Dell recommends filling both slots, especially if you rely on the processor's built-in graphics, because a single module can reduce performance.

Dell's documents only say "DIMM slots" and don't say whether they are full-size DIMM or laptop-style SO-DIMM. Full-size desktop DIMMs are the usual choice for this chassis, but that isn't confirmed, so check the modules already installed before you buy. Dell doesn't mention ECC either. The chipset is the consumer-grade Intel B460, so plan on standard non-ECC, unbuffered DDR4.

Buying tips

  • Buy a matched pair (for example 2x8 GB or 2x16 GB) to get dual-channel.
  • Don't pay extra for modules rated above 2666 MT/s; the system won't run them faster.
  • Look at what's installed first. Many units ship with a single DIMM, so you may only need to add a second matching one.
  • Use a 64-bit operating system to access more than 4 GB.

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Storage: one NVMe M.2 slot and one SATA bay

The storage M.2 slot takes a 2280 or a 2230 PCIe SSD. It is PCIe Gen 3 x4 NVMe. Dell lists up to 1 TB for 2280 and up to 512 GB for 2230, and the self-encrypting (Opal) 2280 option goes up to 512 GB. SATA M.2 drives are not listed, so stick to NVMe. There is also a separate M.2 2230 slot, but it is for the Wi-Fi/Bluetooth card, not storage.

The SATA bay holds either a 3.5" or a 2.5" drive, not both. Dell lists 3.5" hard drives up to 4 TB (5400 RPM) or 2 TB (7200 RPM), and 2.5" hard drives up to 2 TB (5400 RPM) or 1 TB (7200 RPM). Dell's capacity figures are for hard drives, and it doesn't state a thickness limit for 2.5" drives. The second SATA connection is for the slim optical drive. Dell's listed setups pair one M.2 SSD with one SATA drive.

Dell also lists Intel Optane memory (16 or 32 GB, M.2) paired with a hard drive. Optane only speeds up storage; it doesn't add to or replace RAM. It needs a 7th-gen or newer Core i3/i5/i7, 64-bit Windows 10, the Intel RST driver and UEFI boot.

Other options are limited. There is one half-height PCIe x16 Gen 3 slot and one half-height PCIe x1 Gen 3 slot. A second SSD would need a PCIe adapter card, which must fit the half-height slots.

Buying tips

  • Choose an NVMe (PCIe) M.2 SSD, not a SATA M.2 one.
  • Check whether you need 2280 or 2230 length. Capacity is higher for 2280.
  • Don't plan on both a 2.5" and a 3.5" drive; only one fits.
  • Any expansion card must be half-height (low-profile).

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CPU: 10th-gen Core, Pentium and Celeron up to 65 W

The processor is socketed and replaceable, and Dell's service manual has removal and installation procedures for it. Dell's documents don't name the socket; 10th-gen desktop chips on the B460 chipset use LGA1200. Dell supports only 10th-generation processors in this model.

Supported chips: Celeron G5900 (2 cores); Pentium G6400 and G6500 (2 cores, 4 threads), all rated 58 W; Core i3-10100, i3-10300, i3-10105 and i3-10305 (4 cores, 8 threads); Core i5-10400, i5-10500, i5-10600 and i5-10505 (6 cores, 12 threads), all rated 65 W. The i5-10600 is the fastest listed. Dell lists no Core i7 or i9 for this model. The 35 W "T" chips are listed for the Micro chassis, not this SFF.

Dell lists the i3-10105, i3-10305 and i5-10505 in later revisions of its documents, so they may need a recent BIOS. Update the BIOS before swapping the CPU. If BitLocker is on, suspend it first. Dell's documents also disagree on the i5-10500's cache (14 MB in one, 12 MB in another), which is a documentation inconsistency rather than a difference you need to act on.

Other LGA1200 chips, such as 11th-gen or K-series parts, may physically fit but are not supported by Dell. The board has a proprietary design and a locked B460 chipset, so treat them as untested and risky. Anything above 65 W is outside Dell's design for the cooling.

Buying tips

  • Check which CPU you have now; the move from a Celeron or Pentium to an i3 or i5 gives the biggest gain.
  • Stick to the supported list above, and to 65 W or less.
  • If you buy an i3-10105, i3-10305 or i5-10505, update the BIOS first.
  • Core i3 and i5 chips have UHD 630 graphics; Celeron and Pentium have UHD 610.
  • Avoid 11th-gen and K-series chips; Dell doesn't support them.

Cheapest compatible right now

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How to upgrade

Before you start

  • Check the model: this guide is for the OptiPlex 3080 Small Form Factor, not the tower or Micro.
  • Back up your files before opening the case.
  • Check what's installed (DIMMs, M.2 SSD, SATA drive, CPU model) so you buy parts that fit.
  • If you're changing the CPU, update the BIOS first and suspend BitLocker if it is enabled.
  • Have the owner's manual or service manual open for exact disassembly steps.

Steps

  1. Back up your data
    Copy important files to an external drive or cloud storage, especially before changing a drive or the BIOS.
  2. Update the BIOS (CPU upgrades)
    If you're fitting a new CPU, update the BIOS first, following Dell's BIOS update instructions. Suspend BitLocker beforehand if it is turned on.
  3. Power off and unplug
    Shut the computer down fully, then unplug the power cable and any other cables. Press the power button once to drain leftover charge.
  4. Ground yourself
    Touch bare metal on the chassis or use an anti-static wrist strap before touching components. Hold parts by their edges.
  5. Open the case
    Follow the owner's manual or service manual for exactly how to remove the cover on this model.
  6. Install the new part
    For RAM, fit modules in the DIMM slots, ideally as a matched pair. For an NVMe SSD, use the storage M.2 slot, not the Wi-Fi slot. For a SATA drive, use the single drive bay. For a CPU, follow the service manual's processor removal and installation steps; the processor and heat sink are listed as separate parts.
  7. Close up and reconnect
    Refit the cover and reconnect the cables and power.
  8. Check the BIOS
    Turn the computer on and open the BIOS setup screen to confirm it shows the new memory, drive or processor. For a new SSD, you may need to install or restore an operating system before it appears in Windows.

Good to know

  • Dell's documents only say "DIMM slots" and don't confirm whether they are full-size DIMM or SO-DIMM, or whether ECC is supported. Plan on standard non-ECC desktop DIMMs and check the installed modules.
  • Dell doesn't name the CPU socket; 10th-gen chips on the B460 chipset use LGA1200.
  • Dell doesn't state a thickness limit for 2.5" drives, and its drive capacities are listed for hard drives.
  • Dell doesn't give a minimum BIOS version for each CPU, so update to the latest BIOS before a CPU swap.
  • Dell's documents disagree on the i5-10500's cache size (14 MB versus 12 MB).
  • Configurations vary by unit. Many ship with a single DIMM, a Celeron or i3, and a SATA hard drive, so check what you have before assuming a slot is free.

Frequently asked questions

How much RAM can the OptiPlex 3080 SFF take?

Up to 64 GB in total, using two 32 GB DDR4 modules. Dell lists a 4 GB minimum, and the full amount is available to 64-bit operating systems.

What RAM speed does the OptiPlex 3080 SFF support?

DDR4 at up to 2666 MT/s. Faster modules will not run faster than that. Fill both slots for dual-channel performance.

Can I add a second SSD to the OptiPlex 3080 SFF?

There is one M.2 slot for storage, and the other M.2 slot is for the Wi-Fi card. You can add a SATA drive in the drive bay, which takes either a 3.5" or a 2.5" drive. A further NVMe drive would need a half-height PCIe adapter card.

Does the OptiPlex 3080 SFF support SATA M.2 SSDs?

Dell doesn't list them. The storage M.2 slot is listed as PCIe Gen 3 x4 NVMe, so choose an NVMe SSD.

What is the best CPU for the OptiPlex 3080 SFF?

The fastest CPU Dell lists is the Core i5-10600 (6 cores, 12 threads, 65 W). The i5-10505 is also listed. Dell lists no Core i7 or i9 for this model.

Can I put an 11th-gen CPU in the OptiPlex 3080 SFF?

Dell doesn't support it. Some 11th-gen chips may fit the socket physically, but they are untested on this board and risky, so stick to the supported 10th-gen list.

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.