I think that most of the short EGA cards do "Super EGA" modes, so all of yours having three oscillators are not that surprising.
The most common Super EGA mode was 640x480 (VGA modles 11 and 12), but many cards also offered 800x560 and some weird in between resolution.
Something I have been reading about that we really take for granted is video mode "Auto Switching". As I understand it, prior to this feature being popularized by cards like the Paradise EGA Autoswitch, you would have to manually initialize the desired video mode before starting the software you wanted to run. From what I can tell, some pre-autoswitch cards could be manipulated via software after rebooting the system, but I suppose others required jumper changes.
BTW, I'd be very careful about playing with any of the Super EGA modes if you don't have a multi sync monitor. It's possible to fry a standard EGA display...or so I've been told.
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