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QNAP TS-855EU vs QNAP TS-873AEU
The quick verdict
- Lower power drawQNAP TS-873AEUdraws 52.5 W, 26.6 W less than the TS-855EU
- Leads on more specsQNAP TS-855EU4 of 6 differing specs (CPU cores 8, boost clock 2.8 GHz)
- Best forTS-855EU for creators moving large video files fast
Rankings and scores come from the specs alone and are not affected by affiliate commissions.
Spec ruler
In short
Bottom line. Of the 6 specs that differ, the QNAP TS-855EU leads on 4 (CPU cores, boost clock, base RAM, and 1 more) and the QNAP TS-873AEU on 1 (operating power); 1 is within 2%. On our home media server index, the TS-855EU scores 35/100 against 31/100.
Using the 14 specs published on QNAP's official hardware specification pages, here is how the QNAP TS-855EU and QNAP TS-873AEU compare. CPU cores: the TS-855EU at 8 cores versus 4 cores for the TS-873AEU, 4 cores more (2.0x). Among 204 QNAP models, the TS-855EU ranks in the top 3% and the TS-873AEU in the top 22%. The TS-855EU leads on boost clock, 2.8 GHz to 2.2 GHz, 1.3x. Among 201 QNAP models, the TS-855EU ranks in the top 47% and the TS-873AEU in the bottom 37%. On base RAM, the TS-855EU posts 8 GB and the TS-873AEU 4 GB, a gap of 4 GB. Among 219 QNAP models, the TS-855EU ranks in the top 23% and the TS-873AEU in the bottom 47%. PCIe slots: the TS-855EU at 2 slots versus 1 slot for the TS-873AEU, 1 slot more (2.0x). Among 146 QNAP models, the TS-855EU ranks in the top 21% and the TS-873AEU in the top 49%.
Key differences 3
CPU coresTS-855EU leads
- TS-855EU 8 cores vs the TS-873AEU at 4 cores
- the TS-855EU has 2.0x the CPU cores
- among 204 QNAP models: TS-855EU in the top 3%, TS-873AEU in the top 22%
8 cores for backups and transcodes at once
Base RAMTS-855EU leads
- TS-855EU 8 GB vs the TS-873AEU at 4 GB
- the TS-855EU has 2.0x the base RAM
- among 219 QNAP models: TS-855EU in the top 23%, TS-873AEU in the bottom 47%
8 GB out of the box for several apps
PCIe slotsTS-855EU leads
- TS-855EU 2 slots vs the TS-873AEU at 1 slot
- the TS-855EU has 2.0x the PCIe slots
- among 146 QNAP models: TS-855EU in the top 21%, TS-873AEU in the top 49%
2 PCIe slot(s) for a 10GbE card later
Key specs at a glance
| Spec | TS-855EU | TS-873AEU |
|---|---|---|
| CPU cores | 8WINtop 3% | 4top 22% |
| Base RAM | 8 GBWINtop 23% | 4 GBbottom 47% |
| PCIe slots | 2WINtop 21% | 1top 49% |
| Operating power | 79.1 Wbottom 35% | 52.5 WWINtop 39% |
| Boost clock | 2.8 GHzWINtop 47% | 2.2 GHzbottom 37% |
Show every spec
| Spec | TS-855EU | TS-873AEU |
|---|---|---|
| Drive bays | 8top 35% | 8top 35% |
| CPU cores | 8WINtop 3% | 4top 22% |
| Boost clock | 2.8 GHzWINtop 47% | 2.2 GHzbottom 37% |
| Base RAM | 8 GBWINtop 23% | 4 GBbottom 47% |
| Max RAM | 64 GBtop 19% | 64 GBtop 19% |
| Max LAN speed | 2.5 Gbpsbottom 48% | 2.5 Gbpsbottom 48% |
| LAN ports | 2bottom 38% | 2bottom 38% |
| M.2 slots | 2top 4% | 2top 4% |
| PCIe slots | 2WINtop 21% | 1top 49% |
| USB ports | 4top 35% | 4top 35% |
| Weight | 8.1 kgbottom 50% | 7.97 kgtop 50% |
| Volume | 11.4 Ltop 46% | 11.4 Ltop 46% |
| Operating power | 79.1 Wbottom 35% | 52.5 WWINtop 39% |
| Warranty | 3 yrtop 7% | 3 yrtop 7% |
| Metric (0–100) | TS-855EU | TS-873AEU |
|---|---|---|
| Performance percentile | 79.4WIN | 41.4 |
| Lightness percentile | 48.8 | 50.7WIN |
| Compactness percentile | 53 | 53 |
| Home media server fit | 35WIN | 31 |
| Small office fit | 100 | 100 |
| 10GbE video editing fit | 52WIN | 44 |
| Low-power compact 24/7 fit | 0 | 0 |
The details
How to choose
- CPU cores matters most → the TS-855EU (8 cores vs 4 cores)
- Operating power matters most → the TS-873AEU (52.5 W vs 79.1 W)
More TS-855EU leads
- Boost clock: 2.8 GHz vs 2.2 GHz
More TS-873AEU leads
- Operating power: 52.5 W vs 79.1 W
Combined metrics
- Expansion slots in total (M.2 plus PCIe): TS-855EU 4 vs 3
- Total built-in LAN bandwidth (sum of port speeds): 5 Gbps on both
- Operating power per bay: TS-873AEU 6.56 W vs 9.89 W
Combined metrics
- Weight per bay: TS-873AEU 1 kg vs 1.01 kg
- Memory headroom (max minus base): TS-873AEU 60 GB vs 56 GB
Within 2%
- Weight: TS-855EU 8.1 kg, TS-873AEU 7.97 kg
Same on both
- drive bays 8, max RAM 64 GB, max LAN speed 2.5 Gbps, LAN ports 2
- M.2 slots 2, USB ports 4, volume 11.4 L, warranty 3 years
Use-case scores
- Home media server: TS-855EU 35 vs 31
- 10GbE video editing: TS-855EU 52 vs 44
Variant TS-855EU-RP
- matches the TS-855EU on drive bays, CPU cores, boost clock, and 9 more but differs on weight (9.47 kg vs 8.1 kg) and operating power (78.7 W vs 79.1 W).
- Where values differ, this comparison does not carry over to the TS-855EU-RP.
Variant TS-873AEU-RP
- matches the TS-873AEU on drive bays, CPU cores, boost clock, and 9 more but differs on weight (9.2 kg vs 7.97 kg) and operating power (58.1 W vs 52.5 W).
- Where values differ, this comparison does not carry over to the TS-873AEU-RP.
Use-case scores are Specotomy's own index, computed by fixed rules from official manufacturer specs; they are not manufacturer scores.
FAQ
- Which draws less power, the QNAP TS-855EU or the QNAP TS-873AEU?
- The TS-873AEU, with 52.5 W against 79.1 W for the TS-855EU.
- Which use cases suit the QNAP TS-855EU and the QNAP TS-873AEU?
- 10GbE video editing: the TS-855EU. (based on our own use-case index)