Is the RTX 5060 good enough for 1440p gaming?

It is a 1080p card first. At 1440p you will need to drop settings or lean on DLSS in demanding games, and the 8GB of VRAM can be tight in texture-heavy titles.

What is DLSS 4 and does this PC support it?

DLSS 4 is Nvidia's upscaling and frame-generation tech. The RTX 5060 supports it, and it can raise frame rates noticeably in games that include it.

Is 8GB of VRAM enough?

For 1080p at high settings, usually yes. For 1440p, ray tracing, or games with large textures, 8GB can force lower settings or cause stutter.

What CPU, RAM and storage does it come with?

The listing does not state them. Ask the seller for the exact CPU, memory amount and speed, SSD size and power supply model before buying.

Can I upgrade it later?

A standard desktop can usually take more RAM, a bigger SSD and a new graphics card, but that depends on the motherboard and power supply, which are not listed here.