Maximum speed for Amiga 4000D accelerator?

[fishy_fiz]

Dosbox, at a rough guess will be something akin to a 16mhz 386 on a 100mhz 060. Framerates will depend on how a game performs on that spec system.
As for cybervision 64/3d its an s3 virge chipset card (what was popular on early pentium era pcs), but on a zorro interface.
Is it a custom chipset, well that depends on a persons perspective, but technically it could be said all gfx cards are.
Comparing it to aga is like chalk and cheese though. Raw theoretical speed, color depths, etc. absolutely destroy aga 9 times out of 10, but system friendly software isnt really coded the same way so you dont get to seet pushed like aga gets pushed. Itll be a lot faster for some things, especially on zorro3, and similar for others

[fishy_fiz]

As I said it depends on perspective.
Some might be more of the opinion that a custom chipset is something that offloads duties from a cpu in their own (custom) way.
There's no absolute yes/no answer.