The expansion you have is a RAM expansion. No CPU acceleration. Though the RAM will make the system a bit faster. It also has an FPU and a battery backed-up clock.
DF0: and DF1: are floppy drives, not hard drives. If you have DHx or HDx, then they are hard drives. You have 2MB of chip RAM and 8MB of fast RAM on the expansion card.
If you want to sell the disks you can sell them as "blanks, but might have some software on" if you want to remain moral :-)
--
moto
--EDIT
Beat me to it :-)
