Question about WD Blue SN500

i have an old motherboard, can i use a pci adapter without any problem?

Now I have already drilled a hole in the housing and the wall behind it :(

But you are right ;) That is of course an incorrect statement and so I have now passed it on for correction. Thanks for the report :)

Well, first 80 cm long, then 2.38 cm high... Units are just a matter of luck.