Originally Posted by Art Vanelay
Really? I would have expected that the integration of the CPU and GPU onto one die would lower latency. I guess the memory could be a limiting factor; is that the reason?
The kinect is a gimmick. The only reason people will buy this system will be because of exclusive games. The PS4 will be purchased by everyone who wants something cheap and/or people who like Sony's exclusives.
Well, yes, memory access is a limiting factor. Right now with an APU the CPU and GPU portion only share access to a very small on-die pool of memory, and share access to the larger system RAM pool.
As another has stated, APU's have a tendency to scale very well with higher speed memory, as it can access it a lot quicker. This higher level of scaling is even seen now, on architectures that aren't utilizing hUMA, so who knows how much farther it is going to scale when the CPU and GPU can both address the memory pool without the extra steps.
Another advantage of an APU, aside from the low cost and decent level of performance on a cheap system, is the ability to Crossfire it with certain discrete GPU's. It is possible to buy an AMD APU, and pair it with a really low cost discrete Radeon HD, in crossfire, to squeeze out a few more horsepower.
All in all though, my prediction is that in the next 2 to 3 years, we will see APU's with the performance level of current mid to higher end discrete CPU and GPU combos. Think the power of an Intel 3570 and an AMD 7950 or 7970 on one die........