The specs state that this PC (and many others) has no fewer than two additional M.2 expansion slots for an SSD, but none of them have any.
I inquired at the Coolblue store, and the employee confirmed the website's information. Based on this, I bought a PC with an additional M.2 SSD, but at home, it turned out there wasn't an additional M.2 slot. I bought an additional PCI card for the SSD elsewhere, and it works fine. The PC itself works fine.
However, incorrect information on the website, and consequently from the Coolblue employee, cost me an extra trip to the store, an extra purchase of a separate card, and extra time.
I find it annoying, but even more troubling, that after a month, Coolblue still hasn't updated these specs, despite reports from their own employees and two of my own.
I hope the store can rectify this soon, also for other PCs with likely incorrect additional M.2 slots.
