The OS memory waste is 100+ Mb when using networking. There is also additional waste of memory that is used for framebuffers because the PS3 video scaler is crap. (can only scale horizontally and only from certain resolutions) So, if you have a 1280x720 game, but you want to support 1080p output (which is preferred since some TVs only take 1080i/p and not 720p), worst case is that you need to stretch blitt your 1280x720 screen to a double buffered 1920x1080 frame buffer. Lets see, 1920*1080*32bit*2 = ~16Mb. If you had a functional scaler you'd only need an extra 1280x720 buffer which is ~3.5Mb so the difference (~12.5Mb) is pure memory waste on top of the 100Mb. If you for some reason want 16-bit per component all the way the waste is doubled.
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