
Originally Posted by
wolfslayer
NO. They are wrong.
DXT1's have no alpha channel. Textures that don't need an alpha channel should be saved as DXT1s.
Saving a DXT1 as a DXT5 creates an UNUSED alpha channel that increases video memory usage by 2x for that texture.
I'll explain in detail later..using one of the russian unit textures as an example.

I agree with you, DXT 1 has no alpha channel and if a unit doesn't uses it then it's better to save as DXT1 it helps eliminate the the file size by nearly 50% that frees up the VRAM and game becomes more stable on mid end cards. Plus one can use this space to make a bigger canvas and add more pixels on it to increase the quality of the unit texture.
And i don't think any explanation is required here it's basic funda.

Originally Posted by
Caesar Clivus
Just do a search for DXT5. It gets mentioned a lot

Yep do a search there are plenty of tutorials that brag about it. "make sure etc"
Edit
Pic:-