4GB RAM Replacement for Samsung M471A5244CB0-CTD | DDR4 2666MHz PC4-21300 1Rx16 1.2V SODIMM 260-Pin Memory Module

Bought item twice and both time product work flawlessly. Excellent price as well.

Bought it as a trial, it was only 12$, simple to click into my NAS and works brilliant. A-Tech 4GB RAM Replacement for Samsung M471A5244CB0-CTD | DDR4 2666MHz PC4-21300 1Rx16 1.2V SODIMM 260-Pin Memory Module

A-Tech is my go-to place for desktop and laptop memory. Love the prices.

The Acer Aspire XC-830-UW91 mini tower desktop PC has two 4 GB memory slots to give it a total of 8 GB of RAM memory. For less expensive Acer Aspire XC-830-UW91 PCs, Acer only gives you 4 GB of Samsung RAM memory in the 1st memory slot. This memory module is compatible with that OEM Samsung memory that you install in the second memory slot to give you the maximum 8 GB of RAM memory without issue. NOTE: When you first power on the PC after installing this additional memory ... the PC will start, appear to stop booting to Windows for a moment, then completely reboot after identifying the additional memory and start Windows normally. Also note despite what other memory sellers may state, the current Acer Aspire XC-830-UW91 PCs only have a maximum total of 8 GB memory capacity and a maximum of 4 GB per memory slot. Hope this helps Acer users because none if this is in Acer's tech specs concerning memory upgrades.

Half the price of the Synology branded module. This works great in my ds220+. I highly recommend

Installed in my Synology DS920+ and its been a few months, no issues. Great value for NAS use purpose.