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The AS620XTs have ASUSTOR's usual design for easy servicing. Remove the one-piece cover and there is easy access to RAM expansion SODIMM slots on the back of the main board, protected by flaps cut in the board's plastic insulator.

To remove the fan, power supply or main board, you'll need to remove a half-dozen or so screws to lift off the rear panel. Once that is done (the fan connects via a single cable), you can get at everything else pretty easily. The main board and drive backplane are joined via a connector, so you don't have to undo the drive backplane to remove the main board.

The board design itself is very similar to the AS5104T's, with many of the same components used.

ASUSTOR AS6204T board top

ASUSTOR AS6204T board top

Note both SODIMM slots are full, with two 2 GB modules to provide the 4 GB of standard RAM. The modules are held in place with silicone putty, to ensure they stay put during shipping, according to ASUSTOR. There is no mention of this, however, in the RAM installation guide.

ASUSTOR AS6204T board bottom

ASUSTOR AS6204T board bottom

The key components are summarized in the table below, with those of the AS5104T and AS5004T. We're guessing the AS6202T uses an alternate load of the board above, probably dispensing with some of the ASM SATA components due to its lower slot count. But the designs are similar enough to allow the AS6204T to be tested in a two-drive configuration and accurately represent the AS6202T.

Component AS6204T ASUSTOR AS5104T ASUSTOR AS5004T
CPU Intel "Braswell" quad-core Celeron CPU N3150 @ 1.60 GHz Intel J1900 quad-core Celeron @ 2.0 GHz Intel dual-core Celeron J1800 @ 2.4GHz
RAM 4 GB DDR3 SoDIMM (2 x 2 GB), upgradeable to 8 GB 2 GB DDR3 SoDIMM, upgradeable to 8 GB 1 GB DDR3 SoDIMM, upgradeable to 8 GB
Ethernet Broadcom BCM57781 (x2) Broadcom BCM57781 (x2) Broadcom BCM57781 (x2)
USB 2.0 Terminus Tech FE 1.1 USB 4 port controller
USB 3.0 In CPU ASM1074 ASM1074
SATA - ASM1061 x1 PCI Express to two ports of Serial ATA (x2)
- ASM1466 one lane (Dual-channel) 6 Gbps Serial ATA Repeater (x2)
- ASM1061 x1 PCI Express to two ports of Serial ATA (x2)
- ASM1466 one lane (Dual-channel) 6 Gbps Serial ATA Repeater (x2)
- ASM1061 x1 PCI Express to two ports of Serial ATA (x2)
- ASM1466 one lane (Dual-channel) 6 Gbps Serial ATA Repeater (x2)
I/O ITE8728F Super I/O ITE8728F Super I/O ITE8728F Super I/O
Video Unknown part marked DP139
not noted not noted
Audio Realtek ALC887 7.1 audio codec not noted not noted
Table 1: Key component summary and comparison

With two drives, the NAS drew 19 W with WD Red 3 TB (WD30EFRX) drives spun up and 12 W with them spun down for power save. With four drives loaded, the power draw was 29 W active and 17 W in power-save. We judged noise level low for both two and four-drive configurations.

ASUSTOR doesn't provide a way to bypass bad block checks during volume resync. So RAID 5 and 10 rebuild times were long, at around 8 hours 45 minutes for a 4 X 3TB configuration


The AS620XT NASes are powered by the recently upgraded ADM 2.5 operating system. It's important to note the new ADM 2.5 uses a different file structure and you can't roll back to a previous version of ADM after upgrading. To find out more, you can check out the new features of ADM 2.5 here.

New features include:

  • iSCSI LUN snapshots with up to 256 snapshot versions per LUN
  • Internal backup to drives designated as "MyArchive" hard disks
  • Enhanced Network Recycle Bin based on shared folders rather than storage volumes
  • DataSync for Microsoft One Drive (OneDrive for Business not supported by the app).

ASUSTOR also has a Live Demo if you want to wrap your hands around the UI and check out some of the new features. If you want to learn more about the ASUSTOR NAS or want to get more out of the ASUSTOR NAS that you already own, be sure to check out the ASUSTOR College. The image below shows the landing page on the live demo site.

ASUSTOR ADM 2.5 landing page on Live Demo site

ASUSTOR ADM 2.5 landing page on Live Demo site


ADM 2.5.0.R9G1 firmware was loaded onto an AS6204T and performance tests were run using the Revision 5 NAS test process. Since the AS6202T uses the same processor, RAM and Ethernet components, all testing was done on the AS6204T sample provided for review. The AS6204T tests used four drives configured in single RAID 0, 5 and 10 volumes. The AS6202T tests used two drives in single RAID 0 and 1 volumes. All tests were run using Western Digital Red 3 TB (WD30EFRX) generously loaned by WD.

The composite image below shows how the AS6202T and AS6204T compare to other products for File Copy Write Performance. The File Copy Write test for both ASUSTOR AS510XT NASes turned in virtually identical scores of ~ 110 MBps, virtually identical to their AS500XT and AS510XT siblings.

Note that quite a few NASes in both charts are clustered around 110 MB/s, which seems to be the limit of our test process that uses a single Gigabit Ethernet connected client. We consider performance within 5% as equal for ranking purposes.

ASUSTOR AS6202T and AS6204T file copy write performance comparison

ASUSTOR AS6202T and AS6204T file copy write performance comparison

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