QNAP TS-864eU-RP-8G-US eight-bay 2U short-depth NAS review

The QNAP TS-864eU-RP-8G-US is the redundant-power configuration of the TS-864eU eight-bay short-depth rack family. QNAP’s U.S. Store names the exact 8G-US model, and its current comparison distinguishes the RP chassis by two 300W power supplies rather than one. The front-facing storage and network plan is otherwise close to the non-RP sibling: eight native SATA bays, two 2.5GbE ports, and one PCIe Gen 3 x2 slot. This is a source-based assessment, not a test of failure handling, noise or transfer performance.

What the RP suffix changes

QNAP lists two 300W supplies for the RP version, versus one on the non-RP model. The user guide’s earlier 4G configuration also shows two supply positions and lists two power cords, but that is not proof of every 8G-US box’s included cable contents. The RP suffix describes a hardware power arrangement; it does not mean that the disk array is mirrored or that the device has a backup. If uptime across a supply fault is important, confirm how QNAP documents the exact supply and alarm behavior, and plan compatible power feeds. A second feed from the same failed circuit does not create independent facility power.

QTS can create a two-drive RAID 1 arrangement when the owner supplies compatible drives and initializes it. This is separate from PSU redundancy: the mirror addresses a member-drive failure, while dual supplies address a different power-system risk. Neither protects against deletion, ransomware, theft or loss of the whole NAS. Budget a separately maintained backup and practice restoring files rather than treating either form of redundancy as a substitute.

Eight bays and one card slot

The published layout is eight 3.5-inch SATA bays, with QNAP listing 3.5-inch SATA hard drives and 2.5-inch SATA SSDs as supported media. The product’s M.2 path is optional via a PCIe adapter; it does not add built-in M.2 sockets. Two 2.5GbE RJ45 interfaces provide multi-gigabit connections, but neither port count nor link aggregation guarantees that one client transfer will reach an aggregate rate. A faster 5GbE or 10GbE adapter is optional and competes for the sole expansion slot with M.2/USB cards. Confirm exact adapter compatibility and the full network path before treating it as a required capability.

QNAP’s current product page names an Intel Celeron N5095 four-core/four-thread CPU, with burst up to 2.9GHz. The comparison’s 8GB selector lists 8GB DDR4 and a 16GB maximum. QTS is the default OS; QNAP says QuTS hero can be selected on this family starting at QTS 5.2.2. At 8GB the configuration meets the stated memory floor for QuTS hero, but not the 16GB minimum for inline data deduplication. Switching from QTS to QuTS hero changes the file system and requires reinitialization, so migrate only after making and checking a separate backup.

Short-depth still needs a rack-fit check

QNAP’s current comparison reports 88.6 × 432 × 297.4mm and 20.3lb for the RP configuration. The older English-U.S. family manual reports 88.6 × 482.14 × 346.43mm and 7.9kg (17.42lb) for TS-864eU-RP-4G. The width, depth and weight figures do not agree. The product page recommends optional RAIL-S01 short rails; the older guide names RAIL-B02. Because the documents describe different RAM-generation configurations and do not agree on physical measurements, verify the exact delivered chassis, rail compatibility and front-to-back clearance before loading it into a rack. Do not use the lighter or shallower number as a rack-load or fit guarantee. QNAP lists a three-year standard warranty on the U.S. Store page; written package terms should control the actual purchase.

When the redundant supplies earn their complexity

This is worth comparing if a small rack needs eight SATA positions and the owner has a real plan for redundant power feeds, alerts and compatible replacement supplies. It is a weaker fit if the second PSU is being mistaken for data protection, if the space has no separate power path, or if a second expansion card is essential. The 2U chassis, drive set, rails and network path all require their own checks; the captured listing does not establish that a seller bundle includes drives, rack rails or every optional card. Compare the exact TS-864eU-RP-8G-US suffix and whether any offered add-ons are separate items.

No hands-on reliability, measured throughput or failover result is claimed here. QNAP’s own performance demonstrations depend on their test environment, and a nominal 2.5GbE port rating says nothing about the speed of a complete storage workflow. Treat the current specifications as a planning baseline, verify the selected hardware and seller package, and keep a restorable backup on a different system.