Even with say a difference of 10% in yields it does make a reasonable difference in cost. They don't have more than one SKU of chips in this metric, they are either good or bad so therefore they probably cannot reach the same level of yield per wafer as a GPU manufacturer who can bin for different markets.
True but the Xenos itself
does have a redundant shader array, so it can withstand die defects to a certain extent by design.
With the GPU the package includes both an ED-Ram and a GPU chip so yields are even more important for this relatively more expensive package, which is why the GPUs of the PS3 and Xbox 360 are typically a year behind the CPU in progressing to a new node.
The former on the packaging yes, but the PS3 GPU isn't a node behind because of any other reason than it uses a completely different node to begin with, namely Toshiba's CMOS. When the OTSS fabs get far enough along to switch, they do. No driver determines when RSX changes nodes other than this, and I believe we should be seeing 45nm soon on RSX.
The Xbox 360 is using Chartered Semi conductors 65nm process for the CPU, NEC 80nm ED-Ram and TSMC 65nm for the GPU IIRC.
There's a thread around here where we were analyzing the Xenos on a half-node shrink; maybe that was when it was hanging out at 80nm, who knows (though probably then also). I tried searching for the thread, but couldn't find it. Maybe someone else has it on tap, though. Anyway if I am confused, then it is in thinking that discussion was in relation to 65nm-->55nm vs 90nm-->80nm. Whichever it was, I was pretty on top of it at the time, I remember that!
I would assume the opposite really. The consoles are designed to be expensive to start with but come down in price as the technology stales.
The consoles, yes, but the agreements struck with the IP firms at the outset are generally fixed-cost agreements. The console can get cheaper afterall without the IP costs for the processors going down - that is why they are licensed to begin with, so that the console makers can control the bulk of the costs on the fabbing side.
More advanced technology tends to be more expensive to license and cheaper technology tends to be cheaper. For example the cost of BRD playback on the PS3 has come down to $9.50 if they pay market rates for it.
Moments in time though. I'll admit to not having any idea as to what BD's playback licensing costs are beyond the hardware itself at the moment - if it is $9.50, well - then it's $9.50. Obviously when MPEG LA and the BDA were hashing this out post HD DVD defeat, it may have settled at a lower spot than initially when it was a bunch of competing claims of IP property; with the BDA it is an aggregation pool vs a one-on-one contract with a party like NVidia or ATI. The licensing costs of BD may come down over tiem simply to allow for a wider adoption rate of the technology as they seek to lower the price of entry along the demand curve; for NVidia and ATI though, I just do not believe there would be any sense in allowing any sort of IP floatdown down the line.
There are members around here that definitively know the answers to this question of course; we can only
hope for their interjection.
The cost of the Xbox 360 is also dictated by their intentions with their Natal interface. They cannot easily reduce the price and then increase it once they bundle the controller with the system. In addition to this one can assume the Arcade is the SKU which also earns them the lowest revenue per unit sold. Ideally they would want to break even on this SKU as it has the lowest earnings potential of their two SKUs.
Well and either way you can't just drop the price of your SKU every couple of months - it would just
seem too fast. But with Natal I don't know that I believe it will be an automatic-inclusion with every Arcade system... I could still see a standalone Arcade, and then the Natal bundles on top of that. $199/$179, $179/$149, $199/$149... I would believe anything.
My take on Natal by the way is more akin to Guitar Hero than it is to a re-envisioning of the console space. I see it as an accessory that in its own right will sell millions and be profitable, and it will play into a specific genre of gaming.