I haven't tested these cards much, but it could be that the amount of memory matters in a benchmark or two - 128MB isn't much... 06 and Unigine DX9?
We need to make different categories for different models (xt, gs and so on), memory bus width, memory IC generation and # of pipelines enabled by default. There will be alot of categories for these cards no matter what we do. You can add separate categories if the AMOUNT of memory makes a noticeable difference as well.