Bringing expensive PC to japan – import taxes?

I'll be entering japan on a 5 year work visa. I'm planning to bring my pc to japan for personal use by removing all the components and having them in my carry-on (except the case, which I will buy in Japan).
Problem is my PSU is about 400$ CAD , GPU is like 3k CAD (4090, you can't even find it really, so who can put a price tag on it now ?) , and factoring in the RAM/CPU and everything else, I'd say overall the value of the PC is about 4-5k CAD.

Despite it being for my personal use in Japan, to my understanding I would have to pax 10% import tax (so I'd pay like literally 400 – 500 cad to bring it ) ? Or did I misunderstand and there's exemptions for personal items ?

by problemo04