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Published on April 4th, 2012 22:41
Digital Foundry assesses the extraordinary rumours surrounding the next-gen Sony console.
It's shaping up to be one of the most extraordinary tech stories of the year. If the rumours are true, Sony is leaving its Cell architecture behind, instead working closely with AMD on its next-generation PlayStation.
Last week, the story took on a new dimension with Kotaku posting a major scoop: the machine is codenamed Orbis, and furthering the previous rumour, does indeed sport both main processor and graphics core from AMD. Since Kotaku's exclusive, information has started to leak from other sources - according to VG247, the new console is set for a Christmas 2013 release, so directly head-to-head with the debut of the next-gen Xbox.
"The race is on. With PlayStation Orbis, Sony is looking to meet Microsoft head-on with a Q4 2013 release."
Meanwhile, PlayStation Orbis sketches leak, suggesting a touchscreen/camera combination is part of the proposition, while the codename appears to resolve successfully on Sony's developer portal in the same way that Vita codenames also link through to the site - which is IP white-listed by the way in case you're wondering why you can't get any further.
The evidence such as it is all seems to suggest that the next-generation PlayStation will be arriving more quickly than we imagined, and its hardware make-up signifies a radical departure from the spirit of the designs conjured up during the Ken Kuturagi era.
It's the rumoured choice of CPU from AMD that has surprised many. With PlayStation 3, Sony continued its traditions of bespoke architecture by helping to create the Cell - a central processing core surrounded by eight satellite co-processors (one of which is deactivated to improve chip yields, another of which was blocked off from developers and used for security). Processing performance on the SPU remains absolutely out of this world, and many argue that it's the defining characteristic of the hardware in its first-party exclusive titles enjoying technological advantages over their Xbox 360 counterparts. Unfortunately, SPU coding has proved challenging for many third party games developers, despite the best efforts of Sony's engineering teams in providing robust libraries that allow for advanced features to be almost literally dropped into existing code.
There's also the inconvenient truth that a lot of SPU power was spent on tasks that are typically associated with the graphics chip - in effect, the power of the Cell was often being used to make up for a shortfall in the capabilities of the PS3's RSX. The notion of moving GPU tasks onto the main processor worked for PlayStation 3 but it's somewhat at odds with the way technology is developing generally - the rise of DirectCompute and OpenCL is all about offloading tasks uniquely suited to the massively parallel architecture found in GPUs and freeing up more CPU time, a complete reverse on Sony's strategy with PS3.
"The exotic, vision-driven hardware that characterised the Kuturagi era is over. Sony's strategy is to buy in the best tech and to concentrate its resources on superior game creation tools."
There is interesting talk in VG247's story about abandoned work on a next-generation Cell processor running with 24 SPU co-processors - a route that would have potentially made backwards compatibility with PS3 an option for the new hardware. Unfortunately it would also have increased the issues developers have had with SPU programming, particularly when it comes to scheduling/coordinating tasks. Running six SPUs effectively in parallel took time even for first party Sony developers (check out all the unused SPU time in Killzone 2) so the notion of handling 24 simultaneously would be even more problematic for those less au fait with the architecture.
Backing away from Cell may well surprise or even upset some, but it's entirely in keeping with a firm looking to extract maximum performance from its overall silicon budget - and it's exactly the same strategy the firm employed for PlayStation Vita, licensing established technology from the best in the business and concentrating its own efforts on superior development tools. Some may lament that the era of exotic, vision-driven hardware from Sony that characterised the Kuturagi era is over, but it's safe to say that a combination of non-standard, challenging architecture and lacking devtools contributed significantly to the PS3's uncertain early start.
PS4 represents the ability for Sony to hit the ground running from day one: AMD has proven that it can deliver in terms of both CPU and GPU design, plus the company has unrivalled experience in combining both into a single chip. While it's unlikely to happen at launch, the ability to consolidate hardware like this is immensely valuable in reducing costs at a later stage in the console's lifecycle - something that Microsoft has already achieved with its slimline 360S, and a strategy that Sony itself employed in the past with PlayStation 2.
This approach has already yielded dividends with PlayStation Vita, where Sony's focus on creating
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