Yep! There's such a huge variety of Mac Video Cards that it's really hard to get a handle on it. IMHO, it's because of all the different interfaces Apple went thru and all the workarounds that mfrs had to come up with to get around Apple's intentional limitations at the mid and lower ends of their product offerings.
Though I expect it's not a lot better on the PC Side of things, especially in their PDS era!
)