....and i have a queastion....
we can read here.:

http://reality.artificialstudios.com...tureGuidelines

citation.:
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While requiring the same amount of video memory, disk and system memory usage is a mere 25% of full RGBA, and the differences are undetectable in most cases. Use full RGBA only when DXT3/5 do not suffice in the both the color and alpha quality department, in highly visible expanses, such as skies. :idea:
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my picture 256*256px (DXTn format)... will be 256Kb(in VRAM), 1/2 or 1/4 * 256KB in RAM ? Thats true ?