Yep Retrofan's correct, they are all different (eg one ID4 might be different to another ID4).
http://eab.abime.net/showthread.php?t=55059&highlight=timing&page=69 "Note that you cannot tell from the board revision if the caps are installed or not. You really have to remove the board and check the bottom side where these caps are located.
This fix is quite a few years old. To my knowledge, it was first documented by Eyetech and reported back to ACT, where I did service on those oh-so-flaky Apollo accelerators. I was expecting that by now, every A1200 motherboard has the fix applied. I only have one board where the caps are installed, and it's one where the ACA1230 works perfectly. That's a good indicator that there really is a chipset combination where the components E123C and E125C are required."
http://www.ianstedman.co.uk/Amiga/amiga_hacks/A1200_Mobo_fix/a1200_mobo_fix.html I used an amiga technologies a1200 with my phase iv 50mhz 68030 for years with no problems. IIRC I had to do the graphics fix for it though
http://aminet.net/package/docs/hard/flickerfix It might be that the 030 board I had was tolerant or maybe I did the timing fix, but I don't think I did.
