Eclipse can address a maximum of 500 presets on a single card. That has nothing to do with the card capacity as an old 16 MB would be enough for the job. Fact is that small capacity cards are just no longer available as technology advances and costs decrease. That's the reason today we suggest cards in the 2 GB area.
You can't access more than 500, which we believe is still a huge amount of user presets, including another 100 you can store in the Eclipse RAM memory. 600 in all, should be plenty of stuff, shouldn't it?