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QNAP TS-433EU vs QNAP TS-451DEU
The quick verdict
- Lower power drawQNAP TS-433EUdraws 23.7 W, 4.3 W less than the TS-451DEU
- Leads on more specsQNAP TS-433EU5 of 8 differing specs (CPU cores 4, base RAM 4 GB)
- Best forTS-451DEU for small offices sharing files
Rankings and scores come from the specs alone and are not affected by affiliate commissions.
Spec ruler
In short
Bottom line. Of the 8 specs that differ, the QNAP TS-433EU leads on 5 (CPU cores, base RAM, weight, and 2 more) and the QNAP TS-451DEU on 3 (boost clock, max RAM, and USB ports). On our small-office file server index, the TS-451DEU scores 60/100 against 56/100.
Using the 12 specs published on QNAP's official hardware specification pages, here is how the QNAP TS-433EU and QNAP TS-451DEU compare. CPU cores: the TS-433EU at 4 cores versus 2 cores for the TS-451DEU, 2 cores more (2.0x). Among 204 QNAP models, the TS-433EU ranks in the top 22% and the TS-451DEU in the bottom 9%. The TS-451DEU leads on boost clock, 2.9 GHz to 2 GHz, 1.4x. Among 201 QNAP models, the TS-451DEU ranks in the top 39% and the TS-433EU in the bottom 27%. On base RAM, the TS-433EU posts 4 GB and the TS-451DEU 2 GB, a gap of 2 GB. Among 219 QNAP models, the TS-433EU ranks in the bottom 47% and the TS-451DEU in the bottom 14%. Max RAM: the TS-451DEU at 8 GB versus 4 GB for the TS-433EU, 4 GB higher (2.0x). Among 219 QNAP models, the TS-451DEU ranks in the bottom 25% and the TS-433EU in the bottom 8%.
Key differences 3
CPU coresTS-433EU leads
- TS-433EU 4 cores vs the TS-451DEU at 2 cores
- the TS-433EU has 2.0x the CPU cores
- among 204 QNAP models: TS-433EU in the top 22%, TS-451DEU in the bottom 9%
4 cores for backups and transcodes at once
Base RAMTS-433EU leads
- TS-433EU 4 GB vs the TS-451DEU at 2 GB
- the TS-433EU has 2.0x the base RAM
- among 219 QNAP models: TS-433EU in the bottom 47%, TS-451DEU in the bottom 14%
4 GB out of the box for several apps
Max RAMTS-451DEU leads
- TS-451DEU 8 GB vs the TS-433EU at 4 GB
- the TS-451DEU has 2.0x the max RAM
- among 219 QNAP models: TS-451DEU in the bottom 25%, TS-433EU in the bottom 8%
Upgradable to 8 GB later
Key specs at a glance
| Spec | TS-433EU | TS-451DEU |
|---|---|---|
| CPU cores | 4WINtop 22% | 2bottom 9% |
| Base RAM | 4 GBWINbottom 47% | 2 GBbottom 14% |
| Max RAM | 4 GBbottom 8% | 8 GBWINbottom 25% |
| USB ports | 2bottom 9% | 4WINtop 35% |
| Boost clock | 2 GHzbottom 27% | 2.9 GHzWINtop 39% |
| Operating power | 23.7 WWINtop 12% | 28 Wtop 18% |
Show every spec
| Spec | TS-433EU | TS-451DEU |
|---|---|---|
| Drive bays | 4bottom 35% | 4bottom 35% |
| CPU cores | 4WINtop 22% | 2bottom 9% |
| Boost clock | 2 GHzbottom 27% | 2.9 GHzWINtop 39% |
| Base RAM | 4 GBWINbottom 47% | 2 GBbottom 14% |
| Max RAM | 4 GBbottom 8% | 8 GBWINbottom 25% |
| Max LAN speed | 2.5 Gbpsbottom 48% | 2.5 Gbpsbottom 48% |
| LAN ports | 2bottom 38% | 2bottom 38% |
| M.2 slots | – | 2top 4% |
| USB ports | 2bottom 9% | 4WINtop 35% |
| Weight | 4.01 kgWINtop 27% | 4.15 kgtop 27% |
| Volume | 5.44 LWINtop 14% | 5.58 Ltop 16% |
| Operating power | 23.7 WWINtop 12% | 28 Wtop 18% |
| Warranty | 3 yrtop 7% | 3 yrtop 7% |
| Metric (0–100) | TS-433EU | TS-451DEU |
|---|---|---|
| Performance percentile | 10.4 | 12.5WIN |
| Lightness percentile | 73.5WIN | 73 |
| Compactness percentile | 86.1WIN | 84.3 |
| Small office fit | 56 | 60WIN |
| 10GbE video editing fit | 2 | 18WIN |
| Low-power compact 24/7 fit | 30WIN | 26 |
The details
How to choose
- CPU cores matters most → the TS-433EU (4 cores vs 2 cores)
- Max RAM matters most → the TS-451DEU (8 GB vs 4 GB)
More TS-433EU leads
- Operating power: 23.7 W vs 28 W
- Weight: 4.01 kg vs 4.15 kg
- Volume: 5.44 L vs 5.58 L
More TS-451DEU leads
- USB ports: 4 ports vs 2 ports
- Boost clock: 2.9 GHz vs 2 GHz
Combined metrics
- Total built-in LAN bandwidth (sum of port speeds): 5 Gbps on both
- Operating power per bay: TS-433EU 5.94 W vs 7.01 W
Combined metrics
- Weight per bay: TS-433EU 1 kg vs 1.04 kg
- Memory headroom (max minus base): TS-451DEU 6 GB vs 0 GB
Same on both
- drive bays 4, max LAN speed 2.5 Gbps, LAN ports 2, warranty 3 years
Use-case scores
- Small-office file server: TS-451DEU 60 vs 56
- 10GbE video editing: TS-451DEU 18 vs 2
- Low-power compact 24/7 use: TS-433EU 30 vs 26
Use-case scores are Specotomy's own index, computed by fixed rules from official manufacturer specs; they are not manufacturer scores.
FAQ
- Which takes more RAM, the QNAP TS-433EU or the QNAP TS-451DEU?
- The TS-451DEU, with 8 GB against 4 GB for the TS-433EU.
- Which draws less power, the QNAP TS-433EU or the QNAP TS-451DEU?
- The TS-433EU, with 23.7 W against 28 W for the TS-451DEU.
- Which is lighter, the QNAP TS-433EU or the QNAP TS-451DEU?
- The TS-433EU, with 4.01 kg against 4.15 kg for the TS-451DEU.
- Which use cases suit the QNAP TS-433EU and the QNAP TS-451DEU?
- A small-office file server: the TS-451DEU. (based on our own use-case index)