Is the RTX 5090 worth it over an RTX 5080 here?

For 4K gaming at high refresh rates, VR, or GPU rendering and local AI, the 5090 is a clear step up. If you play at 1440p or mostly do CPU work, a 5080 build would save money with little loss.

Can I upgrade the RAM and storage later?

Yes. It uses standard DDR5 memory and an M.2 SSD, so you can add RAM and a second drive. Check the motherboard's free slots and the power supply's headroom before buying parts.

Will the 24-core Core Ultra 9 285K help with gaming?

Games rarely use all 24 cores, so most of the gain comes from the GPU. The core count matters more for video editing, 3D rendering, compiling and running several heavy apps at once.

What power supply does a system like this need?

An RTX 5090 plus a 285K draws a lot under load, so a quality 1000 W or higher unit is typical. Confirm the included PSU wattage and rating before ordering.

Does it come with Windows 11 Pro?

Yes, Windows 11 Pro is listed as the installed operating system, which adds BitLocker, Remote Desktop and Hyper-V over the Home edition.

Is this overkill for office work and browsing?

Yes. For documents, email and streaming, a much cheaper desktop performs the same. This machine is aimed at gaming, creative production and GPU compute.