"SVGA" is technically only 800x600.  If they are literally SVGA monitors then 800x600 is the highest res they are designed for.

1024x768 is "XGA."  Seems like they would advertise themselves as such if they were capable.

My (not at all comprehensive) testing couldn't get it to display more than 800x600@60 (or 848x480@60), but I didn't try XGA resolution at lower frequencies than 60.  I'm curious to see if I can try the Apple 832x624 res at a lower freq.  My testing window is closing fast.  School starts next Tuesday.