The description says "2x 2TB" (4TB); however, the spec tab says only "2TB", which is correct?

The correct information is that there are two 2TB HDDs installed, totaling 4TB of storage.

Questions & Answers: Refurbished: Dell Precision T5820 6-Core 3.60GHz CAD Workstation PC Intel Xeon W-2133 128GB RAM 2x 2TB HDD NVIDIA GeForce Gtx 1080 Windows 11

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Dell Precision T5820 6-Core 3.60GHz CAD Workstation PC Intel Xeon W-2133 128GB RAM 2x 2TB HDD NVIDIA GeForce Gtx 1080 Windows 11

Dell Precision T5820 6-Core 3.60GHz W-2133 128GB RAM 2x 2TB HDD NVIDIA GeForce Gtx 1080 Windows 11
Built for professional work such as design, content creation, rendering, engineering, and data-heavy applications.
The W-2133 processor provides responsive performance for design, rendering, engineering, and other demanding professional tasks.
128GB memory supports smooth multitasking and helps handle larger professional projects and files.
2x 2TB provides quick access to applications and project files, with capacity for everyday professional work.
NVIDIA GeForce Gtx 1080 (8GB GDDR5X) supports professional visual work such as CAD, content creation, rendering, and multi-display setups; Windows 11 is preinstalled and ready for the out-of-box setup experience.
Stock photos are used in this listing and may differ depending on configuration. This Renewed product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories and may arrive in a generic box.