Measures Temperatures From -55°C to +125°C in 0.5°C Increments. Fahrenheit Equivalent is -67°F to 257°F in 0.9°F Increments Inside the classic Synology chassis is a rarely seen Ryzen CPU. (Image credit: Future) Synology DS1621+ price and availability

Installing extra RAM in the DS1621+ is via the dedicated cover underneath and definitely worthwhile to maximise performance. (Image credit: Future) Final verdict Our testing found the overall performance of the DS1621+ excellent, and it has plenty of grunt to run a wide variety of apps, host virtual machines, manage a IP camera system and more at the same time. The NAS was able to saturate a 1gBE connection no matter what else we had it doing, peaking at 729 Mbps reading and 710 Mbps writing. With the 10 GbE PCIe connection, it hit 3889 Mbps reading, and 2146Mbps writing, which is getting closer to the limits of the drive array. The second option is the least expensive but is good enough for most cases. Synology DS1821+ vs DS1621+: Here are my servers upgraded to 10Gbps using two different dual PCIe cards. If you want to use the SSDs as storage pool, you can use this script: https://github.com/007revad/Synology_M2_volume Reply PCIe add-in cards, expansion units, and storage drives are sold separately. Refer to the compatibility list for compatible devices.

Tools & Simulations

The DS1621+ has a PCIe slot, which supports a range of 10GbE networking cards. (Image credit: Future) Asus Chromebook Vibe CX34 Flip review: This gaming Chromebook makes a seriously impressive Business tool The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, T OUT is active when the temperature of the device exceeds a user-defined temperature T H. The output remains active until the temperature drops below user defined temperature T L, allowing for any hysteresis necessary. User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple two–wire serial interface. The more is always, the better in terms of capacity, but generally, you won't need drives larger than 250GB for caching.

With that, let's proceed with the upgrade. For this post, I did the upgrades on a DS1821+, but the processes and parts are the same on a DS1621+. Synology DS1821+: RAM upgrade I’ve used this 1821+ since the review, TC. and it’s been quiet. But, that depends on your expectations, it’s not silent. ReplyCreating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. ( Learn more) The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations. More caution is needed when selecting a 10GbE adapter, however, as Synology is rapidly shrinking its third-party hardware compatibility list and focusing more on its own solutions. When we installed the same Emulex dual-port 10GbE adapter we’d used to test the DS1618+, the DS1621+ hung during the boot phase and would only accept a dual-port Intel X520 10GbE adapter. Synology DiskStation DS1621+ review: 10GbE performance

You will need two drives if you want to cache for both writing and reading -- so it's a good idea to get two.

Product Recommendations

The 5-bay DX517 expansion unit uses an eSATA connection, which caps at 5Gbps, to connect to the server. The DS1621+is pretty efficient (we peaked at 77 watts with drives, but mostly used under 40 watts) so the fans did not have to work too hard, but a decent drive amount of noise escapes the NAS.

By the way, the DS1821+ delivered the same performance as the DS1621+ in my testing. That was expected, considering they shared the same hardware specs (and upgrades). Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM. Synology DS1621+ is a powerful and compact 6-bay network attached storage solution designed to store and protect critical data assets. Today’s growing amount of unstructured data requires smarter and increasingly higher performance methods of storing, accessing, and collaborating. Designed for scalability, the DS1621+ enables you to start small, then expand as your data grows.

And finally, the servers have a PCIe slot for an add-on card. In this case, you can use it to add 10Gbps connectivity to the servers -- another must if you're into Multi-Gig. Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. If you use a Comcast gateway, I think only Comcast can fix the issue. And I think they’ll fix it for free.