The PC has i7-6800K which means Win 11 is not possible - I had to have it so removed the SSD and put it into a new PC.
So the one on the offer has no disk, other than that it has:
CPU: Intel Core i7-6800K
GPU: Nvidia GTX 1080
RAM: G.SKILL Ripjaws V DDR4 3200 C16 4x8GB
MBD: Asus X99-DELUXE II
Silent Base 600 - case
Dark Rock 3 - CPU - cooler
DARK POWER PRO 11 | 850W - power
DVD
All worked perfectly and the need of Win 11 was the only reason to get rid of it.