For 800x480 and 32 bit color format it looks like:
Case 5: 800 x 480 @ RGBA8888 (32 bit)
Assuming a target with RGBA8888 (32 bit) color format and a display size of 800 x 480 pixel, the following amount of memory is required:
Chora Objects 8 kByte
Strings 2 kByte
Bitmap Resources (ca. 30 kPix * 4 Byte) 120 kByte
Resoure Data Structure 4 kByte
Font Cache (256x256 Pix) 65 kByte
Internal 16 kByte
---------------------------------------------------------------
Total 214 kByte
plus visible Framebuffer 800x480 Pix * 4 Byte 1500 kByte
plus optional Doublebuffer 800x480 Pix * 4 Byte 1500 kByte
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Overall 3214 kByte
Nevertheless, the real memory footprint always depends on your planned GUI application and on the number and size of used resources.