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Sirius87 on 06 November 2012
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drkohler said:
Sirius87 said:

1. The point that the GPU in the APU in desktop environment is totally limited by the RAM is obviously true (there are a lot of tests showing how the GPUs profit from higher RAM-frequencies, but more than DDR3-1866 is still to expensive for consumers and so the APUs are probably designed for a maximum of DDR3-1866).

3. Afaik all DDR3-modules in desktops work at 64-bit. So using them in dual channel brings us to a combined 128-bit (I'm not sure if you can really say it that way, but at least from a pure available bandwidth POV you now have twice as much).

DDR3-packages themselves usually seem to be capable of up to 32-bit (but I may be wrong here). So if the PS4/PS Orbis uses 8 4Gb/512MB-packages @32-bit that brings us up to a maximum of 256-bit, twice as much as possible in a typical desktop-PC using DDR3-modules in dual channel.

You are mixing up too many things. Firstly, the A10 APU dram clock is limited to 1866MHz. This has nothing to do whether faster drams are exepensive or not, that is just the design limit (the higher the clock in a chip, the more engineering trouble. So there is essentially a point where more clock is just engineering suicide). Secondly, the A10 APU has two 64bit ddr3 memory controllers (so you can't hook ddr4/gddr5 dram to it to make it faster).. That gives you a 128bit bus width, no more, no less.


But can't AMD modify the memory controller? Without doing that of course there won't be a higher bandwidth possible. But as GPUs all the time use different bus width I thought that changing some parts will also be possible in the APU.

And 1866 is only the supported maximum Ram frequency. Tests with 2133 have been done with some mainboards that allow it and the FPS in games profited from it (but only by a small amount when not also OCing the GPU in the APU at the same time).