Hi , I'm the owner of a
Multiface 1 / HDSP 9632 and an HDSP 9652  PCI cards .
These 2 have been working in separate PC's for many years without hiccups.

The thing I've always noticed but didn't bother me until a client recently pointed out, both of them wont  produce any sound in the DAW under 512 buffer size.
Previous machine was an AMD 8320 w 32 gigs of RAM and now Im using an AMD Ryzen 9 3900x w 64gigs.

Is this expected? No lower values can be achieved with PCI cards?