Married to the eight-core processor, Orbis also features Radeon HD graphics hardware. We've previously suggested that AMD's mobile "Pitcairn" design - the Radeon 7970M - could be a strong basis for a next-gen console graphics core in terms of power consumption and die-size. Running at 850MHz and featuring 20 of AMD's "Graphics Core Next" compute units, our information suggests that Orbis shaves off 10 per cent of that number, offering up 18 CUs in total, and sees a mild downclock to 800MHz. Incorporated into a design dedicated to cutting-edge visuals and gameplay, this hardware has some serious potential.
It is perhaps more than coincidence that these specs offer up the 1.84 teraflops metric for the Orbis GPU that was mooted yesterday, assuming that the figure is calculated in the same way that it is for AMD's current "Graphics Core Next" range of products. At this time we cannot confirm the make-up of the Durango graphics hardware - rumours have circulated for quite some time that it is some way behind Orbis, but equally there has been the suggestion that the GPU itself is supplemented by additional task-specific hardware. We could not confirm this, but an ex-Microsoft staffer with a prior relationship with the Xbox team says that two of these modules are graphics-related.
The Radeon 7970M laptop GPU appears to be a
pretty close match for the processing tech inside the next-gen
PlayStation - there's a small reduction in clock speed and the amount of
compute units, but otherwise it's very close. Here's what this tech can
achieve in pure PC terms with Crysis 2 performance compared at the very
high and extreme graphical presets. Freed from Windows and incorporated
into a fixed console design, this GPU will really have room to show us
what it's truly capable of.
Previous rumours have suggested that Orbis runs its CPU cores along with some graphics hardware inside a standalone, custom AMD Fusion core with a separate, discrete GPU. Our sources suggest otherwise - all of these elements are embedded into the same piece of silicon, and we can confirm that the internal codename for the processor is indeed "Liverpool", as was mooted some time ago. Sony does have some form here for pushing the envelope - PlayStation Vita represents the only mobile GPU processor that combined quad-core ARM Cortex A9s with the PowerVR SGX543 MP4. Even on the power-hungry iPad 3, Apple stuck with dual-core CPU architecture at the same 45nm fabrication node.
The news that so much processing power is packed onto a single processor is highly significant to the point where credibility could be stretched somewhat. However, helping to explain matters is the make-up of AMD's Jaguar tech - each core occupies just 3.1mm2 of die-space at the 28nm fabrication standard. Factor in L2 cache, and the overall CPU component could be as little as 75-80mm2 in total. That's in contrast to the 235mm2 of the launch PS3's Cell processor and the 240mm2 of the Emotion Engine chip inside the original PlayStation 2 - neither of which factored in the separate graphics hardware, which in both cases was even larger. By our reckoning, the more efficient eight-core set-up still leaves plenty of space for integrating the main GPU onto the same die, with space to spare. This offers up significant production cost savings and brings down overall power consumption.
"Orbis
has a singular focus on delivering high-end performance without
breaking the bank - our take on the specs is that this is a machine
built to last with a huge amount of potential."
Here's what a mobile Intel quad-core with Radeon
7970M can achieve on Battlefield 3 - superb performance at 1080p on
medium settings and still highly impressive on the high preset. This is
the kind of ballpark processing performance we expect to see on next-gen
consoles, but bear in mind this is couched in PC terms. In a dedicated
gaming box, we should expect much better once developers get to grips
with the hardware.
We also have hard data on Orbis's memory set-up. It features 4GB of GDDR5 - the ultra-fast RAM that typically ships with the latest PC graphics cards - with 512MB reserved for the operating system. This is in stark contrast to the much slower DDR3 that Durango will almost certainly ship with. Microsoft looks set to be using an offshoot of eDRAM technology connected to the graphics core to offset the bandwidth issues the use of DDR3 incurs. Volume of RAM is the key element in Durango's favour - there'll be 8GB in total, with a significant amount (two sources we've spoken to suggest 3GB in total) reserved for the OS.
There'll be a relatively high CPU overhead too, with potentially two cores reserved for the customisable apps Microsoft wants to run in parallel with gameplay. Orbis has no such ambitions and may power past the new Xbox simply because it focuses its resources on out-and-out games power. There's always the possibility that Microsoft has looked at the prior success of Nintendo and its own Kinect and come to the conclusion that chasing after the maximum in raw horsepower isn't the way to win the next console war.
"The
next-gen Xbox refines DirectX 11 for a fixed hardware gaming platform
while Orbis sees a revised version of the LibGCM API used on PlayStation
3 and PS Vita."
Arch
Durango leaker SuperDAE has already revealed next-gen Xbox devkit
pictures plus this screenshot of the Visual Studio development
environment...
Of course, these ballpark tests are not the be-all-and-end-all of next-gen power - let's not forget that the new consoles are dedicated games machines gifted with a host of advantages over PC hardware. Factor out the overhead of the Windows OS, introduce ever-evolving development tools written for a fixed platform, and consider the performance advantages of a dedicated design - particularly the fast interconnects between CPU, GPU and RAM. What we have here is hardware that easily punches above its weight compared to performance couched purely in PC terms. It's a state of affairs borne out by both the Xbox 360 and PlayStation 3: by 2007, PC hardware had already moved significantly beyond the raw horsepower offered by current-gen consoles, yet games like God of War 3, Halo 4 and Uncharted 3 have extracted visual performance that could only have been dreamed of back then. Based on what we know about the next-gen consoles, there's little reason why history can't repeat itself.
That said, the AMD connection that defines both Durango and Orbis confirms that both consoles are much closer in design to gaming PCs than their predecessors, which may result in stronger ports to the computer format, not to mention the upcoming Steam Box - a piece of hardware free to evolve and grow more powerful year upon year in a way that Sony and Microsoft's boxes can't. And surely Valve must be looking at these specs with perhaps a little relief - AMD's CPU architecture is designed with power efficiency in mind, and in pure performance terms, even an eight-core set-up should be comfortably out-performed by a fast, modern desktop Intel quad-core processor. In developing and optimising next-gen titles for the lower power console CPUs, it would be richly ironic if PC owners reaped the benefits...
Source: eurogamer.net
