Never buy it!
As you can see from the photos attached to this comment, the computer was received in a very poor state.
How can you pay over 2000€ to receive this? I don't know if it's LDLC's or ALTYK's fault but you need to get a grip. These services are deplorable.
If I buy a fully assembled computer and not piece by piece it is indeed to be reassured to know that the computer has been made by a professional which is obviously not the case here or you must urgently separate yourself from this employee.
In short, if you hesitate to buy this article, look for another solution urgently!