Is the HP OmniBook X 17 good for gaming?

No. It uses Intel integrated graphics, so it suits casual and older titles at low settings but not modern games. For gaming, look for a laptop with a dedicated GPU.

Is the 17.3-inch screen too big to carry around?

It is a desk-first laptop. The large screen is great for work at home or in an office, but the size and weight make daily commuting less comfortable than a 14- or 15-inch model.

Can I upgrade the RAM or storage?

The 16 GB of RAM is soldered on most OmniBook X designs, so plan on it for the life of the machine. The 512 GB SSD can typically be swapped for a larger drive by a technician.

Does the touchscreen work with a stylus?

It is a touchscreen, but stylus support depends on the specific panel and pen. Check that a compatible active pen is listed before relying on handwriting or drawing.

How does it compare with a 15-inch ultrabook?

You get more screen space and a roomier keyboard, at the cost of weight and bulk. Performance is in the same class as mainstream 15-inch ultrabooks with the same chip and memory.