Asustor · Lockerstor
Asustor AS6504RS
The Asustor AS6504RS is a 4-bay rackmount NAS built around the Intel Atom C3538 processor. Installed memory is 8 GB, expandable to 128 GB. Networking is 2 x 1GbE, 2 x 2.5GbE. With expansion units it grows to 20 drive bays.
- Drive bays
- 4
- Processor
- Intel Atom C3538
- Memory
- 8 GB
- Network
- 2.5GbE
Who it suits
A rackmount unit suits an office with a server rack or a comms room. It works well as the main file server or as a backup target for servers and PCs.
Asustor AS6504RS specifications
| Processor | Intel Atom C3538, 4-core, 2.1 GHz |
|---|---|
| Memory installed | 8 GB (1 x 8 GB) DDR4 SO-DIMM |
| Maximum memory | 128 GB (4 x 32 GB) |
| Drive bays | 4 x 3.5" SATA HDD or 2.5" SATA HDD/SSD |
| Maximum bays with expansion | 20 |
| Network ports | 2 x 1GbE, 2 x 2.5GbE |
| USB ports | 4 x USB 3.2 Gen 1 |
| Expansion slots | 1 x PCIe 3.0 x8 slot (x4 link) |
| HDMI | none |
| Form factor | Rackmount 1U |
| Size (H × W × D) | 44 x 439 x 515 mm |
| Weight | 7.85 kg |
| Power consumption | 47.7 W operation / 28.4 W disk hibernation |
| Power supply | 250 W |
| Warranty | 3 years |
Specifications from Asustor's published data, checked October 2026. See the AS6504RS on Asustor's website. Confirm details before ordering.
Usable capacity by RAID level
How much space the AS6504RS gives with typical drive sizes.
| RAID level | 4 × 4 TB | 4 × 8 TB | 4 × 12 TB | 4 × 16 TB | 4 × 20 TB |
|---|---|---|---|---|---|
| RAID 5 | 12 TB | 24 TB | 36 TB | 48 TB | 60 TB |
| RAID 6 | 8 TB | 16 TB | 24 TB | 32 TB | 40 TB |
| RAID 10 | 8 TB | 16 TB | 24 TB | 32 TB | 40 TB |
Space is shown before formatting; expect about 10% less in use. Larger systems are often split into more than one RAID group.
What we do with it
- Storage
NAS supply and installation
A right-sized Synology, QNAP or Asustor unit with the drives, RAID level and network setup your office needs.
- Backup
Automatic backup setup
Scheduled backups of PCs, servers and shared folders to the NAS, with an off-site copy, so nobody has to remember to do it.
- Versions
Ransomware protection for NAS
Point-in-time snapshots and protected copies that let you roll a folder back to how it was before an attack or a mistake.
- Move
Data migration
We move your files, users and permissions from old servers, external drives or an ageing NAS.
Questions about the AS6504RS
How much usable storage does the AS6504RS give?
It depends on the drives and the RAID level. With 4 × 8 TB drives in RAID 5 you get about 24 TB before formatting. The capacity table on this page shows other combinations.
Can the AS6504RS be expanded?
Yes. With Asustor expansion units it supports up to 20 drive bays in total.
Can the memory in the AS6504RS be upgraded?
Yes. It ships with 8 GB and Asustor lists a maximum of 128 GB.
Does the AS6504RS have 10GbE?
Not built in. Its ports are 2 x 1GbE, 2 x 2.5GbE. It has an expansion slot, which can take a faster network card where Asustor lists one for this model.
What warranty does the AS6504RS have?
Asustor lists a hardware warranty of 3 years for this model.
Do you supply the AS6504RS with drives and installation?
Yes. We supply it with compatible drives fitted, configured and tested, and can install it at your office. Ask for a quote on this page.
Similar Asustor models
- 4-bay
Asustor AS6504RD
Intel Atom C3538, 8 GB, 2 x 1GbE, 2 x 2.5GbE
4-bay alternatives from other brands
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