The GST/PST/HST/QST will be the same as you would pay at your neighbourhood computer parts shop.
I don't think we Canadians have any particular tariffs on Chinese goods. That's a ludicrous idea from that crazy oompah loompah.
Duty can be looked up on the CBSA website if you have an hour or two to spare.
Duty depends on what the item is and where it was manufactured.
The service/customs brokerage fee depends on the shipping company and on the value of the goods.