Is Unity Not Release CPU Memory(DRAM) After Upload To GPU(VRAM)?

Hi

i'm new guy for Unity, but has some experience in flash developing with Stage3D (Starling).

In Flash Stage3D , if i want use an Texture in Scene, there should be two steps.

First

i need load the the compress file(png,jpg) to CPU Memory(DRAM) and Decompress

Second

i need upload the decompress data to GPU Memory(VRAM)

after that i can Release the Memory use in DRAM (as the data file is never use in 3D Rendering)

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i think this should be the same in Unity, so i make one dome to check it out.

First

i create one project , and import one Texture in it(2048x2048), but not put any thing in the scene

So the Total DRAM use for Textures is 57.3 MB, and VRAM use for Textures is 2.7 MB

Second

i put one sprite in the scene with the Texture.

(Please See the IMG in forum)

the DRAM use is the same 57.3 MB , and the VRAM use change to 24 MB.

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i delete the Texture and run the empty scene

(Please See the IMG in forum)

the default DRAM use is 14.6 MB

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basic on the demo , i think Unity not release the memory after upload to GPU,

is that right?

if so , anything i can do to release the memory manually?

thanks