Quote - Is the information above the numbers for the GTX580 1.5GB or the GTX 580 3GB?

All 500 series cards have 64/32 texture slots.

 

Hmm so the card memory doesn't has to do with texture slots then.  Again, I still have a lot to learn.  :( Thank you guys.

 

Then 64 rgb slots sounds like a very few slots, 144 sounds much better.

So for renders that use more than one skin layer like wounds on top of a skin texture map those would be occupying two RGB slots?