In most countries the import tax or custom duties are usually assessed on what you are importing and what it holds in value. Depending on how old your computer and graphics cards are and what they hold in current resale value will be biggest factor if you will end up paying import tax or custom duties.
The Albanian Customs website states:
In most countries, it is possibly to do a temporary import. The above-mentioned ATA carnet is used in all countries you want to enter, including Albania.
The German Customs Office explains re-export like this: Temporary admission
The concept of this is similar to driving a car into another country. While you use the car there, it's a temporary import.