Is the HP Z2 Mini G1i good for CAD and 3D modeling?

Yes. The 10-core Intel CPU and NVIDIA GPU are aimed at professional CAD, 3D and media apps, and HP certifies the Z2 line for major ISV software. Check that your app is on the certified list for the exact GPU.

Can I upgrade the RAM and storage?

The Z2 Mini chassis allows some memory and storage upgrades, but space is tight and the exact limits depend on the configuration. Confirm the slot count and maximums for the model you order.

How does it compare with a Mac mini?

The Z2 Mini runs Windows and professional Windows software with an NVIDIA GPU, which the Mac mini does not offer. The Mac mini is smaller and quieter but has no discrete GPU option.

Does it come with a monitor and keyboard?

Workstation mini PCs are usually sold as the system unit only. Plan on adding a monitor, keyboard and mouse unless the listing states otherwise.

Is it loud under load?

It is quiet for office work, but the compact fan spins up during sustained rendering or simulation. Expect noticeable noise in long heavy sessions.

Is 16 GB of RAM enough?

For light CAD and office work, yes. Large assemblies, video editing and heavy multitasking benefit from more, so choose a configuration with more memory if that is your workload.