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If you want the best bang for your buck NAS then TerraMaster is probably the best brand to go for. I reviewed their F2-210 last month and it offered incredible performance for such a low price.
The value for money TerraMaster offers continues throughout their range, from a hardware perspective little really competes with them.
Yesterday they announced their latest TerraMaster F5-422 5-bay NAS as well as upgraded the full Fx-422 family.
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TerraMaster F5-422 vs F5-221 Changes

Looking at a side by side comparison of the F5-422 vs F5-221 there is only one change, but it is extremely important. The new NAS now has a built-in 10Gb Ethernet Port which allows you to take full advantage of the increased speeds you can achieve certain RAID modes or via the SSD cache.
According to the TerraMaster F5-422 product page with 5 Seagate IronWolf 6TB hard drives in RAID 5 mode, the device’s read and write speeds can reach 650MB/s and 670MB/s, respectively.
TerraMaster F5-422 Features

The F5-422 retains all the other superb features of the F5-221 which includes an Intel quad-core Celeron J3455 1.5 GHz (turbo boost up to 2.3 GHz) processor, 4GB DDR3 memory, and HDMI out.
The memory is upgradable to 12 GB (4 GB + 8 GB) and TerraMaster state this is capable of 4K (4096 x 2160) 30FPS transcoding. According to the Plex compatibility chart, this is correct and the NAS can go all the way up to H.264 2160p or decode only with HEVC UHD 2160p.
TerraMaster F5-422 Price & Competition
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The TerraMaster F5-422 is listed on Amazon at £519.99 which is actually cheaper than the older F5-421 which sells for £549.99.
There is not really a directly competing product from Synology. The £660.81 Synology DS1019+ is the best bet which also has 5-drive bays, and uses the Intel J3455. It does not have a 10Gb Ethernet port though, but it does have 8GB RAM and two M.2 NVMe SSD slots for system cache support
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Then there is the QNAP TS-453B-4G 4 Bay or TS-653B-4G 6-bay, both of which cost more, neither have 10Gb Ethernet but both can be upgraded via PCIe.
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Fx-422 family
TerraMaster has upgraded other models in the family too including the F2-422 is a dual-drive NAS bays up to 32TB of storage support and the F8-422 offering 8-slots of drive bays for a maximum of 128TB of storage.
State-of-the-Art TOS 4.1.0 Operating System
With the most recent version of the TOS operating system, TOS 4.1.0, you can back up your data, manage your file server, and optimize your sharing services in an intuitive, simple, and user-friendly way. The operating system includes a complex of application software, with rich application content, potent multimedia services, and numerous ways to back up your data. TerraMaster TOS is constantly updated to constantly improve your NAS with more than 10+ updates to the system since the new version release.
Smart Mobile App
With the TNAS mobile app, quickly access your TNAS device and its multimedia data without restrictions, all simply through your iOS or Android system. TNAS.Online also makes it easier to setup your network settings to make your NAS highly available for users, even via the internet. The service provides a free-of-charge way via URL to securely content from your TerraMaster NAS and make it available in your own personal cloud.
TerraMaster F5-422 vs F5-221 Comparison Table
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