TrueNAS R20 vs TrueNAS R50
Both are single-controller hybrid rackmount NAS appliances in the R-Series, running TrueNAS with OpenZFS. They share the same software, protocols, and management — the difference is scale.
The R20 is the cost-effective entry point at 12+2 drive bays and 3.4 PB raw capacity. The R50 jumps to 48+4 bays and 6.5 PB raw, with NVMe cache instead of SATA SSD cache and a higher throughput ceiling (10 GB/s vs 8 GB/s).
| Spec | TrueNAS R20 | TrueNAS R50 |
|---|---|---|
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| Storage Type | Hybrid (HDD + SSD cache) | Hybrid (48× 3.5″ + 4× 2.5″ NVMe) |
| Form Factor | 2U–10U scalable | 4U–12U scalable |
| CPU | 6–16 Cores | 6–16 Cores |
| Memory | 64–192 GB DRAM | 64–192 GB DRAM |
| Cache | 2× 800 GB SATA SSDs | 4× 800 GB NVMe SSD |
| Networking | 2× 10/25/40/100 GbE + up to 6× 10GBaseT | 2× 10/25/40/100 GbE + up to 4× 10GBaseT |
| Max Throughput | 8 GB/s | 10 GB/s |
| Max Raw Capacity | 3.4 PB | 6.5 PB |
| View R20 | View R50 |
Which one's right for you?
Choose the R20 if…
- Your total capacity target is under ~3 PB raw and you don't expect rapid growth.
- You're building a backup or archival tier where per-TB cost matters more than throughput.
- You want the lowest entry price in the R-Series with full TrueNAS Enterprise features.
- 2× 10/25/40/100 GbE plus 6× 10GBaseT is enough networking headroom.
Choose the R50 if…
- You need 4× the drive count and roughly 2× the raw capacity per chassis.
- Workloads are sensitive to cache-tier performance — NVMe SSD cache beats SATA SSD cache on the R20 for mixed read/write profiles.
- You expect to scale beyond 3.4 PB and want headroom up to 6.5 PB without re-platforming.
- Throughput peaks of 10 GB/s vs 8 GB/s matter for your application.
Where they're identical
Both run TrueNAS Enterprise with OpenZFS, the same RAID-Z1/Z2/Z3 + dRAID layouts, the same SMB/NFS/iSCSI/Fibre Channel/S3 protocol stack, the same TrueSecure (FIPS 140, NIST 800-209) options, and the same replication and snapshot tooling. Both are single-controller — if you need dual-controller HA, look at the M-Series instead.
Need to compare against a different model? TrueNAS R60 is the NVMe-flash sibling at 60 GB/s, and the H-Series adds NVMe acceleration to hybrid configurations.
Help picking between R20 and R50
Tell us your capacity target, workload mix, and rack budget — we'll size and configure either model and stay on the order through delivery.