My understanding is that the Blizzard accesses ram on a 32 bit bus so it can see (2) x 128MB or 256MB total. The Cyberstorm PPC accesses memory on a 64 bit bus and can only see 128MB maximum. This has been discussed before and accessing more memory on either card simply isn't possible with out a major redesign/rework of the hardware and the needed information isn't even available anymore.
-Jeff
