Is there enough clearance in this case for a large graphics card, and what is the maximum GPU length supported?

Yes, there is enough clearance for a large graphics card. The maximum GPU length supported is 410mm.

What are the dimensions of the Cooler Master MASTERBOX 520 MESH SAKURA LIMITED EDITION case, and will it fit on a standard-sized desk?

The dimensions of the Cooler Master MASTERBOX 520 MESH SAKURA LIMITED EDITION case are 443 mm in height, 210 mm in width, and 498 mm in depth.

Questions & Answers: Cooler Master sakura MASTERBOX 520 MESH SAKURA LIMITED EDITION, Mini ITX, Micro ATX, ATX, SSI CEB, E-ATX* Tempered Glass Case, 280mm/360mm Supported, ARGB Fans and Hub Included(MB520-WGNN-S02)

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Cooler Master sakura MASTERBOX 520 MESH SAKURA LIMITED EDITION, Mini ITX, Micro ATX, ATX, SSI CEB, E-ATX* Tempered Glass Case, 280mm/360mm Supported, ARGB Fans and Hub Included(MB520-WGNN-S02)

Large mesh intakes offer unrestricted airflow and stellar thermals for demanding systems.
The top panel is entirely removable for improved access and easy installation of cooling solutions such as fans and radiators.
Supports up to seven 120mm fans and dual 360mm radiators on the top and front panel.
The included controller allows users to manage systems lighting independently from the hardware configuration and provides the user with 4 additional fan headers in case of need.
The HDD cage is completely (re)movable for improved access during assembly and system upgrades.
The I/O panel comes with a USB 3.2 (Gen 2) Type-C port, a USB 3.2 (Gen 1) Type-A port, and one 3.5mm (audio + mic) headset jack.
The ventilated PSU cover supports both active and passive cooled PSUs installed in multiple orientations.
MasterBox 520 is natively compatible with ITX, M-ATX and ATX motherboards.
E-ATX motherboards, such as SSI-CEB models, are compatible with dimensions up to 12" x 10.7".

$199^.99 –