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drkohler on 23 January 2013
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ethomaz said:

zarx said:

true lol, having 8GB of RAm plus an extra 2GB of VRAM would be already bloody expensive.

a) Reserving a specific chunk of main RAM as VRAM kinda degfeats the advantage of unified RAM tho. Could be they are using the extra 200MB for debug or something, that is probably more likely actually.

b) I agree... it's weird and bad to make the system reserve fixed amount of RAM to graphcis... if Sony really wanted that then they just put 2GB DDR3 (4) for system and 2GB GDDR5 for graphcis... not shared.

c) The advantage of the unified RAM (4GB GDDR5 or other) is to make the system shared dinamicaly depending on the usage of each component.

We are rumour mongering about a developer unit here not the end product. Having more ram than in the end product means that developers might be inclined to be careless which might cause serious problems in the end.

a) Imagine a developer making a super game using 3G of video ram. Sure it looks great on his developer unit but what happens later? The PS4 is supposed to have 4G of ram total (of which 512MB is rumoured to be system space, initially). If you use too much for your textures and stuff, there is no game running. It really does make sense to put limits into the developer units.

b) Since there seems to be consensus about a unified memory pool, a split ddr3/GDDr5 architecture for developer units is obviously out of question.

c) you are right but there must be limitations at all times on just how "wide the swing is allowed" between ram usage in a unified pool.