Is the RTX 5080 enough for 4K gaming?

Yes for most titles, especially with DLSS 4 and frame generation enabled. At native 4K with maximum settings, demanding games will need upscaling to hold high frame rates.

How does it compare with the RTX 5090 configuration?

The 5090 version is roughly a tier faster and carries more VRAM, which matters for 4K and heavy ray tracing. The 5080 model costs less and is the better fit for 1440p and mixed 4K use.

Does the Core Ultra 7 265KF need a liquid cooler?

It runs warm under sustained all-core loads, and the 360 mm AIO in this build gives headroom for long gaming sessions and rendering. Air cooling works but is louder under load.

Can I upgrade the GPU or memory later?

The full-size tower and standard ATX parts leave room for a larger graphics card and extra memory or storage. Check the power supply wattage before moving to a higher-tier GPU.