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Voice assistant (local)
Workload guide · AI

Voice assistant (local): hardware requirements guide

Local STT/TTS and wake-word (Whisper, Piper, Rhasspy).

Always-on 24/7

Hardware requirements by tier

Three tiers for every workload: the minimum that works, the recommended sweet spot, and the comfortable headroom level. These are the same tiers the WisePC decision engine uses when it plans a build around your goal.

TierCPU coresRAMStorageGPUVRAMNetwork
Minimum4 cores8 GB0.25 TB (ssd)None—1 GbE
Recommended8 cores16 GB0.5 TB (ssd)dedicated4 GB VRAM1 GbE
Comfortable12 cores32 GB1 TB (ssd)ai12 GB VRAM2.5 GbE
Overkill20 cores52 GB2 TB (ssd)ai12 GB VRAM2.5 GbE

Beyond Comfortable — 20 cores, 52 GB RAM, 2 TB (SSD): headroom you will never use for this workload alone. Put the difference into storage, backup or silence.

Recommended system shape

Derived by the decision engine from the recommended tier — the same logic that plans full builds.

Form factor
tower
Build style
diy
Drive plan
2× 2TB NVMe

Requirements (8 threads, 16GB RAM, 4TB storage, dedicated GPU) need a custom tower build.

One box or a separate machine?

Keep on the main server

GPU-bound compute is expensive to duplicate — a second GPU box roughly doubles cost for little resilience gain. Keep it on the main machine.

Whether this workload deserves its own system or should live on the main server.

Storage arrays, priced

Five physical strategies for the recommended capacity — the same planner, drive model and reference prices as the storage planner tool.

StrategyDrivesUsableCostIdle
Cheapest 1× 4TB hdd4 TB · none≈ €2255 W
Balanced 1× 16TB hdd16 TB · none≈ €6986 W
Redundant 3× 8TB hdd8 TB · parity2≈ €123615 W
Expansion-friendly 1× 20TB hdd20 TB · none≈ €8787 W
Performance Recommended2× 4TB nvme4 TB · parity1≈ €15762 W

For a fast working tier, go all-flash — the performance strategy protects speed without the HDD rebuild pain.

Backup is not storage

The extra copy that survives drive failure, deletion and ransomware — the same engine as the backup planner.

Protect 0.5TB with at least two copies on separate hardware, ideally one offsite. The recommended start is a dedicated NAS.

Recommended: Separate NAS
A dedicated box that only stores backups · ≈ €259
high
No offsite copy

Add a second copy outside the building — cloud or a drive at a friend's house.

medium
No versioning

Use a versioning-aware tool (restic, borg, Backblaze) that keeps history.

medium
Unscheduled backups

Schedule backups automatically and monitor them.

medium
Backup on the same machine

Keep the backup on separate hardware or offsite.

What will it cost?

Market-neutral EUR bands from the reference drive model (≈ = estimated street price). Live component prices resolve on the build page for your region.

Storage array
≈ €225 – €1576
Array energy / year
≈ €81/yr
∼37 W idle

Compute (CPU, board, RAM, GPU) is not included — see the recommended build for live prices.

Growth outlook

What happens when the data keeps growing — the same engine as the growth simulator.

This architecture becomes inadequate in year 2 — 2 bays needed. Plan the next step (bigger array, NAS or DAS, or a stronger platform) before then.

Exceeds max 2TB by 1TB — need larger array/DAS/NAS. Fresh Performance array for 3TB: 2 bays, ~1576€.

Which tier do you need?

  • Pick Minimum (4 cores, 8 GB RAM) only for a single-purpose machine on a tight budget — expect little headroom.
  • Recommended (8 cores, 16 GB RAM) is the sweet spot: enough for the workload plus the usual side-services, without overspending.
  • Pick Comfortable (12 cores, 32 GB RAM) when this workload shares the machine with others or will grow — you pay for headroom, not for anxiety.
  • GPU rule for this workload: dedicated.GPU rule for this workload: dedicated (4 GB VRAM).
Keep going

Frequently asked questions

How much RAM does voice assistant (local) need?
8 GB is the sensible minimum, 16 GB covers most real setups, and 32 GB gives comfortable headroom for growth and extra services.
How many CPU cores does voice assistant (local) need?
A 4-core CPU is the minimum, 8 cores is the recommended sweet spot, and 12 cores is comfortable when it shares the machine with other workloads.
Does voice assistant (local) need a dedicated GPU?
A dedicated GPU is required for this workload. Plan 0–12 GB VRAM (0 minimum, 4 recommended, 12 comfortable).
What storage and network does voice assistant (local) expect?
Storage: 0.5 TB of SSD is the recommended baseline (0.25 TB minimum, 1 TB comfortable). Network: 1 GbE is the recommended baseline.
What runs well alongside voice assistant (local)?
It pairs naturally with: Home Assistant, Local AI inference.
How much power does voice assistant (local) use?
The storage array idles around 37 W (≈ 81 €/year at 0.25 €/kWh). The full system adds CPU, board and fans on top — see the cost section for the honest bands.

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