When expanding an A1200 or an A3000/A4000 to the max, here are the major bottlenecks/differences:
- BlizzardPPC (the most powerful A1200 accelerator) uses 32-bit memory addressing, can address up to 256MB of ram
- CyberstormPPC and MKIII (the most powerful A3000/A4000 accelerators) use 64-bit memory addressing, can address up to 128MB of ram
- BlizzardPPC uses 8-bit Fast-SCSI-II protocol (theoretical 10MB per sec speed)
- CyberstormPPC and MKIII use 16-bit Ultra-Wide-SCSI3 protocol (theoretical 40MB per sec speed)
- Mediator 1200 (all flavors) is hurt by the 8MB Zorro II memory space limitation which cripples Warp3D memory usage to about 4MB of video ram (very sucky when playing 3D games)
- Mediator 3000/4000 does not have any immediate memory addressing limitations
- Grex1200 while a good product is tricky to get working with a BlizzardPPC due to requirement of a rare rev. 2 BlizzardPPC board, does not suffer from any ZII addressing limits as it communicates with the Blizzard PPC expansion bus directly, is not as solid as the Grex4000D version
- Grex4000D is rare, expensive, however when matched with a CyberstormPPC or a MKIII card makes your A4000D an ultimate classic amiga, in my opinion.