QNAP TS-453Be NAS with 8GB RAM upgrade, includes 2.5GbE LAN and USB, original box included.

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I am listing a QNAP 4-bay NAS, the TS-453Be. I am selling it because I have upgraded to a new model.
■ Product Features
This is a QNAP 4-bay NAS equipped with an Intel Celeron J3455 quad-core processor (up to 2.3GHz). It features dual Gigabit LAN, a PCIe slot, and 5 USB 3.0 ports, making it versatile for home and small office use. It also functions well as a media server. The PCIe slot allows for the addition of network expansion cards or M.2 SSD cache cards.
While there are many affordable NAS options available, QNAP is a highly reliable brand with extensive apps, management features, and support, ensuring long-term, worry-free use even for home applications.
■ Customization and Usage
The memory has been upgraded from the original 4GB to 8GB (maximum configuration). The original 4GB memory module is also included.
It has been in operation for several years and has operated stably without any disk failures or RAID rebuilds.
■ Specifications
CPU: Intel Celeron J3455 Quad-Core 1.5GHz (up to 2.3GHz)
Memory: 8GB DDR3L (upgraded, maximum configuration)
Drive Bays: 3.5-inch / 2.5-inch SATA x 4
LAN: Gigabit LAN x 2
USB: USB 3.0 x 5, USB 2.0 x 1
Expansion Slot: PCIe Gen2 x2 x 1
■ Product Condition
The unit is in normal working condition. It shows signs of use consistent with normal operation, but there are no noticeable scratches or stains. It has been cleaned.
■ Included Accessories
Main unit
Original accessories (power cable, etc.)
Original box
Original 4GB memory module (removed)
USB-connected 2.5GbE LAN adapter (bonus) *Used by connecting to the rear USB port for a 2.5GbE environment. No driver installation required.
*HDDs are not included.
■ Transaction Details
Immediate purchase is welcome. Price negotiation is not accepted. Will be shipped via Raku Raku Mercari Bin (Takkyubin).
Highly recommended for those who want to introduce a reliable QNAP NAS or want to quickly try out a 2.5GbE environment. Thank you.