Hi :^)
You've got an Amiga 2000 GVP A3001, that was the fastest
A2000 accelerator back in the 1989 year.
It was 25 or 28 MHz, with a 8 Mb fast ram expansion (not 16)
and used 1 Mb GVP 30 (or 32) pins simms.
The 40 pins connector is for the IDE interface (slowwwww)
that can be used with 512 Mb Hard Disks max.
For that time that was not so bad, but extremely expensive,
I remember having paid about to 2300$ for it fully loaded and
950$ more for a 80 Mb Quantum Hard Disk! And I took TWO of each, OUCH!
Amigalement,
Jean-François Bachelet.