Home Assistant has no single, workload-based CPU, RAM and storage minimum. The right specification depends on whether you use a dedicated appliance, Raspberry Pi, generic x86-64 computer, container or virtual machine, and on how much history you retain. Official guidance gives firm prerequisites for some platforms but does not promise that a particular processor, memory size or disk will support a specific number of devices, cameras or automations.
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For a straightforward dedicated installation, Home Assistant Green is the official plug-and-play reference. A Raspberry Pi 4 or 5 is the documented do-it-yourself baseline, while an existing 64-bit computer can work when its firmware and storage meet the x86-64 requirements. Storage deserves as much attention as CPU: Recorder keeps history locally, and its growth follows the entities recorded and the retention period.
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What Home Assistant officially supports
Home Assistant documents several deployment routes rather than one universal hardware target: Home Assistant Green, Raspberry Pi, Odroid, generic x86-64 computers, containers and virtual machines. Its hardware FAQ says, “Home Assistant Green is the recommended option for most people.” That recommendation is about setup simplicity and a managed appliance, not a claim that every other platform is too slow. See the official hardware FAQ and the installation overview for the supported choices.
Choose the platform first, then size the host around its boot method, power supply, storage medium and workload. Clock speed alone is not a meaningful comparison between an Arm appliance, a Raspberry Pi and an Intel- or AMD-class computer. The official material reviewed does not include a benchmark translating entity count, integration count, camera use or automation volume into a required CPU or RAM figure.
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Requirements by installation path
| Installation path | CPU guidance | RAM guidance | Storage guidance | What matters most |
|---|---|---|---|---|
| Home Assistant Green | Rockchip RK3566, quad-core Arm Cortex-A55 at 1.8 GHz | 4 GB LPDDR4X | 32 GB eMMC | Fixed appliance specifications and minimal setup |
| Raspberry Pi with Home Assistant OS | Pi 4 or Pi 5 | At least 2 GB | At least 32 GB microSD; A2 is ideal | Board choice, power supply, card quality and network connection |
| Generic x86-64 with Home Assistant OS | 64-bit-capable Intel/AMD-class system; no universal speed or core minimum is published | No general minimum is specified in the installation guide | UEFI-bootable medium with 512-byte logical sectors | UEFI compatibility, sector size, drive capacity and power draw |
| Container or virtual machine | Host must support the selected container or virtualization stack | Allocate for Home Assistant plus the other workloads on the host | Managed by the host; Home Assistant OS data-disk rules apply only when using Home Assistant OS | Existing infrastructure, administration skill and resource sharing |
The figures in this table are platform requirements or product specifications, not performance guarantees. Home Assistant’s hardware directory and installation pages should be checked for changes before buying or imaging a device.
Home Assistant Green: the fixed-specification option
Home Assistant Green provides a concrete reference point because its hardware is fixed. The published specification lists a Rockchip RK3566 system-on-chip with four Arm Cortex-A55 cores running at 1.8 GHz, 4 GB of LPDDR4X memory and 32 GB of eMMC storage. Those are the specifications of Green itself, not a universal minimum for Home Assistant software. They are useful when you want a dedicated hub without selecting individual components or maintaining a general-purpose operating system. Full details are on the Home Assistant Green specifications page.
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A fixed appliance also narrows the upgrade path: you are accepting the supplied processor, memory and internal storage. If your priority is reusing an existing computer, running unrelated services on the same machine or choosing a different storage layout, a Pi, x86-64 host, container or virtual machine may fit better.
Raspberry Pi requirements
Minimum board and memory
The current Raspberry Pi installation guide calls for a Pi 4 or Pi 5 and at least 2 GB of RAM. It does not publish a universal processor-frequency floor. Treat the 2 GB figure as the documented platform floor, not as a promise that every workload will behave identically at that size. The guide’s exact requirements are maintained at Raspberry Pi installation.
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Boot storage
Use a microSD card with at least 32 GB of capacity; Home Assistant says an A2 card is ideal. Capacity is only one part of reliability. A card must also be appropriate for sustained writes because Recorder continuously updates a local database. If you later move the data disk to another device, the microSD card still serves as the boot medium unless you change the installation design.
Power and networking
Use a suitable power supply matched to the Pi model. Ethernet is described as more reliable than Wi-Fi in the installation guidance, so wired networking is the safer choice for a hub that must remain reachable for automations and integrations. A marginal power supply or unstable network can look like a software failure even when the CPU and RAM are adequate.
Generic x86-64 requirements
The generic x86-64 Home Assistant OS guide focuses on firmware and boot compatibility rather than a processor benchmark. The machine must be 64-bit capable and boot through UEFI. The boot device must expose 512-byte logical sectors; drives that use native 4K sectors only are warned against. The guide does not set a general CPU speed, core-count or RAM minimum, so do not turn a particular desktop or mini-PC specification into an official baseline. Check the current generic x86-64 installation guide before writing an image.
Existing x86-64 hardware can be attractive when it already has a reliable SSD, wired networking and adequate cooling. It may consume more electricity than a small appliance, and firmware settings, boot order and UEFI support require more hands-on work. Confirm the sector format and boot mode before committing the machine; otherwise an apparently suitable drive may fail before Home Assistant starts.
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Containers and virtual machines
Container and virtual-machine deployments use a host you administer. The host must support the chosen container engine or hypervisor, and the allocation must cover Home Assistant alongside every other service sharing that host. The official installation overview lists these methods but does not publish a universal CPU or RAM table for them. In practice, the correct allocation depends on the host’s total workload, storage performance and the isolation features you need.
Do not apply Home Assistant OS data-disk instructions automatically to a container. Those instructions describe moving the data disk of Home Assistant OS; a container normally uses a host-mounted volume or virtual disk managed by the host operating system.
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Home Assistant’s official pages identify supported architectures and example products, not a workload matrix. They do not state that a certain processor supports a particular number of entities, integrations, cameras, automations or retained days. Consequently, buying a faster CPU solely because its clock number is higher is not a defensible sizing method.
- Use the platform’s documented architecture and boot requirements as the first filter.
- Prefer adequate, reliable memory over an unverified claim that a specific core count is “required.”
- Account for other services when Home Assistant shares a host; their memory and CPU demand is part of the decision.
- Expect storage and database behavior to become the limiting factor when long history or high-frequency sensors are recorded.
Green’s 4 GB and the Pi guide’s 2 GB floor are concrete reference points for those products. They should not be presented as universal minimums for every installation type, nor should a generic x86-64 machine be rejected simply because the guide omits a numerical RAM floor.
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Storage: boot capacity is not the same as history capacity
Recorder and database growth
Recorder uses SQLite by default and recommends it. Its documented default retention is 10 days. Database growth depends on which entities are recorded, how often they change and how long records are retained, so the 32 GB figures for a Pi card and Green’s eMMC are not a universal forecast of lifetime storage use. The Recorder documentation explains retention and entity controls.
You can control growth by choosing an appropriate retention period and excluding entities that do not need history. Purging old rows does not necessarily make the database file smaller immediately; the documentation notes that repacking is needed before freed space is reflected in the file size. Leave working room rather than treating the nominal capacity as fully available for recordings, backups and updates.
Recovery headroom
When SQLite corruption requires recovery by creating a new database, Home Assistant states that free space of at least 2.5 times the database size is essential. This is a recovery condition, not a recommendation that every installation needs a disk equal to 2.5 times its database. It is a reason to monitor free space and avoid filling a small boot device to its limit.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Adding a secondary data disk on Home Assistant OS
Home Assistant OS can use a secondary internal SSD or hard drive, or a USB-attached SSD or hard drive, as its data disk. The target disk is overwritten during the move and must have greater capacity than the current boot disk. These constraints make the operation a migration, not a harmless plug-in expansion. Read the procedure in Common tasks for Home Assistant OS and verify the device identity before confirming any destructive action.
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- Back up your Home Assistant configuration and verify that the backup can be restored.
- Connect or install the replacement disk and confirm its capacity is larger than the existing boot disk.
- Follow the Home Assistant OS data-disk procedure, selecting the intended target only after checking its device details.
- Allow the migration to finish, then confirm that Home Assistant starts normally and that history and add-on data are present.
- Keep the original boot media untouched until the new arrangement has been tested and a fresh backup exists.
USB-connected SSDs can draw more power than the host supplies. Home Assistant specifically gives a Raspberry Pi 3 and its official power supply as an example where the extra load may be tight. If a USB disk repeatedly disconnects, investigate power delivery and the enclosure as well as the disk itself.
Choosing the right platform
Choose Green when
- You want the simplest dedicated installation and prefer fixed, published hardware.
- You do not want to select a board, power supply, boot card and operating-system image separately.
- You accept 32 GB of built-in eMMC as the supplied storage and can expand according to Home Assistant OS rules if needed.
Choose a Raspberry Pi when
- You already own a compatible Pi 4 or Pi 5 and are comfortable preparing a microSD card.
- You want a compact do-it-yourself system and can provide a suitable power supply.
- You can use a dependable A2 microSD card and preferably Ethernet.
Choose generic x86-64 when
- You have a spare 64-bit computer with UEFI firmware and a boot device using 512-byte logical sectors.
- You want a conventional SSD, more hardware choice or the option to run other services on the same machine.
- You are prepared to troubleshoot firmware, boot order, cooling and power consumption.
Choose a container or virtual machine when
- You already operate a server, hypervisor or container host.
- You understand volume management, backups, updates and resource contention.
- You want Home Assistant to share infrastructure rather than occupy a dedicated appliance.
Common sizing mistakes and fixes
Treating 32 GB as a universal answer
Thirty-two gigabytes is the documented minimum microSD capacity for the Raspberry Pi route and the published eMMC capacity of Green. It is not a promise that a large Recorder database, backups and other data will fit indefinitely. Set retention deliberately and watch free space.
Buying an incompatible x86 drive
A 64-bit processor alone is insufficient if the system cannot boot through UEFI or the drive exposes native 4K sectors only. Check those properties before installation.
Ignoring power when adding USB storage
An SSD that works on a desktop may disconnect from a small board whose power supply or USB budget is limited. Use an adequately powered setup and test sustained operation.
Comparing only CPU frequency
Architecture, memory, storage type, firmware, power and shared services all affect suitability. Official documentation supplies no cross-platform benchmark that would justify a frequency-only ranking.
Practical pre-purchase checklist
- Identify whether the installation will be Green, Pi, x86-64, container or virtual machine.
- Confirm the required architecture and, for x86-64, UEFI boot and 512-byte logical sectors.
- For a Pi, obtain a Pi 4 or Pi 5, at least 2 GB RAM, a 32 GB-or-larger A2 microSD card and a suitable power supply.
- Estimate which entities need history and select a retention policy before the database grows.
- Reserve free space for updates, backups and SQLite recovery; recovery may require 2.5 times the database size in free space.
- If moving data on Home Assistant OS, use a target larger than the boot disk and remember that the target is erased.
- Prefer Ethernet when reliability matters and verify USB power before attaching an external SSD.
The Bottom Line
There is no universal Home Assistant CPU, RAM or storage minimum in 2026. Use the documented platform prerequisites: Green’s fixed 4 GB/32 GB appliance, a Pi 4 or 5 with at least 2 GB and a 32 GB-or-larger A2 card, or a 64-bit UEFI x86-64 system with compatible 512-byte-sector storage. Size beyond those floors around Recorder retention, the entities you actually record, shared services and the free space needed for maintenance and recovery.
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