Some simple questions:

1) What is the maximum size of a SkyCube?

2) Is it dependant on your videocard?

3) My D3DCAPS says 8192x8192 is my max texture size. Does this mean that my SkyCube resolution limit is 8192x1365, or is it 49152x8192?

4) If it is not one of those, is the limit on a per-side basis(i.e 6 bitmaps of 8192x8192)