Bay count, drive interface and the processor behind the applications · review

Synology DS723+ bundle, 32 GB ECC and 40 TB supplied uninstalled review

The most expensive listing on this shelf by a factor of three and a half, arriving with 40 TB of drives, 1 TB of NVMe and 32 GB of ECC memory — none of it installed, and all of it behind two gigabit sockets.

By Jean-Benoit Buisson

Three thousand five hundred and twenty-nine dollars, and the fifth bullet says what the money does not include: “Hard drives and memory upgrades included separately, not installed, installation required.” The fourth adds that the chassis itself comes in a sealed box. So the parts arrive in the same delivery and the assembly is the buyer’s.

What arrives is substantial. Forty terabytes as two 20 TB SATA drives. One terabyte of M.2 2280 NVMe as two 500 GB modules — which makes this the only listing on this shelf whose solid-state slots come filled. Thirty-two gigabytes of DDR4 ECC SODIMM memory, which is the largest memory supplied with anything here and the only ECC actually in the box: the UGREEN DXP4800 GT on this shelf publishes an ECC upgrade path and ships non-ECC, and the other Synology listing here states its own memory is non-ECC.

The processor is an AMD Ryzen R1600, two cores at 2.6 GHz with a turbo to 3.1 GHz, stated in the second bullet. Two cores is the lowest count among the machines on this shelf that publish one, and this is the most expensive listing here. The capacity and the memory are what the money buys, not the processing.

And then the network. Two RJ-45 sockets at 1GbE, with link aggregation and failover support, stated in the second bullet and repeated in the description. One gigabit each. The UGREEN DXP4800 GT on this shelf cost $659.99 on October 26, 2026 and publishes two 10GbE sockets; the DXP6800 Plus publishes a 10GbE and a 2.5GbE. Forty terabytes of storage reached down a gigabit link is the arrangement the intro to this section warns about when it says a single socket sets a ceiling no drive inside the unit can lift — and here there are two of them, aggregated, which doubles the ceiling and does not raise it.

One eSATA port appears in the second bullet, alongside one USB 3.2. The eSATA is the only one on this shelf, and on a two-bay machine it is the published route to an expansion unit.

The operating system is named: Synology DSM, in the third bullet, plainly. Three listings on this shelf now name their software, and two of the three are Synology. The second bullet also names the Btrfs filesystem and an advanced LUN iSCSI service, and the description adds virtual machine and container storage and use as a network video recorder.

What is not published is an array level. Two bays with 32 GB of ECC memory and Btrfs, and no RAID number anywhere — which means the usable capacity of the 40 TB is unstated. In a mirror it would be 20 TB; added together, 40. The page does not say which it arrives in, and unlike the LinkStation listings on this shelf it does not publish a usable figure either.

No figure in watts, no decibel value. The product record gives 254 by 305 by 254 mm (10 in) and the description calls the form factor a NAS tower server.

Prices quoted in this text were read on October 26, 2026. The live price is at the top of the page.

Where it holds up, and where it stops

Strengths

Thirty-two gigabytes of ECC memory, the largest on this shelf and the only ECC actually supplied rather than offered as an upgrade
The only listing here whose M.2 slots arrive filled, at 1 TB across two modules
Forty terabytes of drives in the same delivery, so the price covers the storage as well as the machine
Names its operating system plainly as DSM, which most of this shelf never does
The only eSATA port on this shelf, which is the published route to an expansion unit on a two-bay machine
States outright that the drives and the memory arrive uninstalled, rather than letting it be discovered

Compromises

Two 1GbE sockets on the most expensive listing on this shelf, where a machine at under a fifth of the price publishes two at ten gigabits
Two processor cores, the lowest count here among the machines that publish one
No array level published, so the usable share of the 40 TB is unstated — twenty terabytes mirrored, forty added together
The drives and the 32 GB of memory have to be fitted by the buyer, into a chassis the page says arrives sealed
No figure in watts and no decibel value, on a two-drive tower meant to run continuously

Specifications

Bay count	Two SATA bays, plus two M.2 2280 NVMe slots — stated in the second bullet, with 40 TB as two 20 TB drives and 1 TB as two 500 GB modules. All four positions arrive filled
Drive interface	SATA for the two bays and M.2 2280 NVMe for the two slots — stated in the second bullet and repeated in the description. The supplied drives are 3.5-inch class at 20 TB each; no inch figure is printed
Solid-state slot count	Two M.2 2280 NVMe, both supplied filled with 500 GB modules for 1 TB in total — stated in the second bullet. It is the only listing on this shelf whose solid-state slots arrive populated
Processor	AMD Ryzen R1600, two cores at 2.6 GHz with a turbo to 3.1 GHz — stated in the second bullet and repeated in the description. Two cores is the lowest count on this shelf among the machines that publish one
Memory	32 GB of DDR4 ECC SODIMM — stated in the second bullet. It is the largest memory supplied with any machine on this shelf and the only ECC memory actually in the box; the fifth bullet states it arrives uninstalled
Ethernet port count	Two — two RJ-45 sockets with link aggregation and failover support, stated in the second bullet and in the description
Port speed	1GbE on each socket — stated in the second bullet. Aggregated, two gigabit sockets double the ceiling rather than raising it, and this is the most expensive listing on this shelf while a $659.99 machine here publishes two sockets at ten gigabits
USB ports	One USB 3.2 — stated in the second bullet, alongside one eSATA port, which is the only eSATA on this shelf and is the published route to an expansion unit
Supported redundancy levels	Not published on the listing — no RAID number appears in the title, the five bullets or the description. The Btrfs filesystem and an advanced LUN iSCSI service are named instead, which belong to the filesystem rather than to an array. With two bays supplied filled and no array stated, the usable share of the 40 TB is unpublished. Carrying on through a drive failure is a different thing from holding the data in a second place
Published operating system	Synology DSM — named plainly in the third bullet and again in the description. Three listings on this shelf name their operating system, and two of the three are Synology
Stated idle power	Not published on the listing — the description names a single power supply and gives no figure in watts
Stated acoustic figure	Not published on the listing — no decibel value and no claim about noise appears, on a two-drive tower
Stated dimensions	Not published in the bullets — the description gives the form factor as a NAS tower server and the product record carries 254 by 305 by 254 mm (10 in)
Amazon reference	B0C5VDNJQ3
EAN	0840104319406
On Amazon.com	Amazon.com had an offer at $3,529 on October 26, 2026.

Where this unit differs

Put against the median of its own group on this site — not against every network product sold.

Memory32 GB of DDR4 ECC SODIMM — stated in the second bullet. It is the largest memory supplied with any machine on this shelf and the only ECC memory actually in the box; the fifth bullet states it arrives uninstalled+300 % against the median of this group
Port speed1GbE on each socket — stated in the second bullet. Aggregated, two gigabit sockets double the ceiling rather than raising it, and this is the most expensive listing on this shelf while a $659.99 machine here publishes two sockets at ten gigabits-60 % against the median of this group
Stated dimensionsNot published in the bullets — the description gives the form factor as a NAS tower server and the product record carries 254 by 305 by 254 mm (10 in)+23 % against the median of this group

The questions that come up before an order

Is it assembled?

No. The fifth bullet states that the hard drives and the memory upgrades are included separately, not installed, and that installation is required. The fourth states that the chassis arrives in a sealed box.

How fast is the network?

Two RJ-45 sockets at 1GbE, with link aggregation and failover. Aggregation doubles the ceiling rather than raising it. Four other machines on this shelf publish a ten-gigabit socket, and every one of them costs less than a third of this.

How much of the 40 TB can be used?

The page does not say, because it publishes no array level. Two 20 TB drives mirrored give 20 TB; added together they give 40 with no protection. Unlike the LinkStation listings on this shelf, this one publishes neither the arrangement nor the usable figure.

Is the memory really ECC?

Yes. The second bullet gives 32 GB of DDR4 ECC SODIMM. It is the only ECC memory supplied with any machine on this shelf; one other names an ECC upgrade path and ships non-ECC, and another states its memory is non-ECC.

Against the rest of the network and storage gear

This network and storage gear share the category and the price bracket. Only what each one states is shown; an incomplete column would mislead.

Model	Price	Bay count	Drive interface	Solid-state slot count	Processor
Synology DS723+ bundle, 32 GB ECC and 40 TB supplied uninstalled	$3529	Two SATA bays, plus two M.2 2280 NVMe slots — stated in the second bullet, with 40 TB as two 20 TB drives and 1 TB as two 500 GB modules. All four positions arrive filled	SATA for the two bays and M.2 2280 NVMe for the two slots — stated in the second bullet and repeated in the description. The supplied drives are 3.5-inch class at 20 TB each; no inch figure is printed	Two M.2 2280 NVMe, both supplied filled with 500 GB modules for 1 TB in total — stated in the second bullet. It is the only listing on this shelf whose solid-state slots arrive populated	AMD Ryzen R1600, two cores at 2.6 GHz with a turbo to 3.1 GHz — stated in the second bullet and repeated in the description. Two cores is the lowest count on this shelf among the machines that publish one
QNAP TS-464-8G, four-bay enclosure with two 2.5GbE sockets	$1003	Four, in the model designation TS-464 — the Amazon.com title, bullets and description never count the bays in words	Not published on the listing — no drive size in inches and no bus is named for the bays	M.2 2280 NVMe PCIe slots, number not given — the second bullet names an M.2 2280 NVMe SSD, sold separately, or an Edge TPU; the description names M.2 PCIe Gen 3 slots and a PCIe Gen 3 slot that takes QM2 cache cards or a 10GbE or 5GbE network card	Intel Celeron N5095, quad-core, up to 2.9 GHz — stated in the description
UGREEN DXP6800 Plus, seven RAID levels named by number, memory unpublished	$939	Six SATA bays, plus two M.2 NVMe slots — stated in the title and in the fourth bullet. It is the only six-bay machine on this shelf; the rest are at one, two, four or eight	Six SATA bays and two M.2 NVMe slots — stated in the fourth bullet with a maximum of 208 TB. Six times 32 TB plus two 8 TB modules is 208, so the arithmetic holds. No drive size in inches is printed	Two M.2 NVMe — stated in the fourth bullet alongside the six SATA bays, and counted within the 208 TB total rather than offered as cache	12th-generation Intel Core i3-1215U — given in the title as a six-core processor and in the third bullet as six cores and eight threads. No clock speed is published
TERRAMASTER F8 SSD Plus, eight M.2 bays and no SATA bay at all	$765	Eight — stated in the title and in the second bullet as eight M.2 2280 NVMe slots, each taking up to 8 TB for 64 TB in total. The arithmetic holds, and it is the highest bay count on this shelf	M.2 2280 NVMe only — stated in the second bullet. No SATA bay appears anywhere on the page, which makes this the only all-solid-state enclosure on this shelf; every other listing here is built around SATA bays	Eight, which is the same as the bay count — the two figures coincide because every bay is an M.2 slot. Each takes up to 8 TB, stated in the second bullet	Intel Core i3-N305, eight cores and eight threads with a turbo frequency up to 3.4 GHz, with UHD Graphics — stated in the first bullet. It is the highest core count on this shelf; the UGREEN DXP4800 GT here publishes four cores, eight threads and a higher clock at 3.70 GHz

What separates the models, in network and storage gear

If price decides: TERRAMASTER F8 SSD Plus, eight M.2 bays and no SATA bay at all, at $765.

The buyer this one serves, among network and storage gear

A buyer who wants ECC memory, forty terabytes and DSM in one delivery, and whose network will never need more than a gigabit.

What this one costs among network and storage gear

Details checked on October 26, 2026.

Sources

Specifications: the manufacturer sheet for network and storage gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

What we look at on this network and storage gear