is there internal storage capacity ? and Can add my own Nvdia card

Yes, it has 4TB SSD storage plus a 1TB docking station set. The product information does not indicate support for adding an NVIDIA card.

Questions & Answers: HP OmniDesk Desktop PC, Intel Core Ultra 7 265, 64GB DDR5, 5TB Storage (4TB PCle SSD+1TB Docking Station), Intel Graphics, Wireless Keyboard & Mouse, Wi-Fi 6, Win 11 Pro, Dark Wood

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HP OmniDesk Desktop PC, Intel Core Ultra 7 265, 64GB DDR5, 5TB Storage (4TB PCle SSD+1TB Docking Station), Intel Graphics, Wireless Keyboard & Mouse, Wi-Fi 6, Win 11 Pro, Dark Wood

Upgraded: Seal is opened for upgrade only, 1-Year warranty on Upgraded RAM/SSD, and original 1-Year Manufacture warranty on remaining components. Intel Core Ultra 7 265, 20 cores, 20 threads, 5.2GHz max turbo powerful for office work and content creation
Intel GraphicsStable, clear visuals for streaming, browsing, office work, light design, and casual games.
64GB DDR5 RAMSmooth multitasking across multiple apps stable and efficient. 4TB SSD + 1TB Dock Storage Ample space for daily files, data, and backups.
Wireless Keyboard & MouseStable connection, comfortable feel cable-free, tidy desktop.
Windows 11 Pro Dimensions: 13.27 x 6.1 x 12.4 in, 14 lbs. Ports: 2x USB-A 3.0, 2x USB-A 3.1, 2x USB-C 3.1, 4x USB-A 2.0, RJ-45, HDMI, DisplayPort 1.4, headphone/mic combo.
Bonus Docking Station Set1x 7-in-1 Docking Station w/1TB Storage, 1x 32GB MicroSD Card with Adapter, 1x Type-C Data Cable, 1x 3-in-1 Charging Cable, 1x Suede Cleaning Cloth.

$2,299^.00 –