The Polaris Connection

Meanwhile perhaps the most surprising aspect of Sony’s announcement isn’t the specifications reveal, but rather that Mark Cerny directly referenced AMD’s Polaris architecture, stating that Sony/AMD "adopted many new features from the AMD Polaris architecture." This is a statement that has a lot of ramifications, but also a statement where nuance is critical because it’s so vague.

To examine the Polaris connection, let’s take a step back in how AMD develops their GPU families. While we like to think of architectures as a monolithic thing- that every aspect of an architecture is built specifically for that given architecture – the truth is quite different. Internally, AMD’s GPUs are developed in block fashion; each major functional unit can be developed separately, and AMD can mix and match the two. Typically, but not always, a major discrete GPU generation contains the latest versions of all of these blocks. Meanwhile semi-custom wins can get a lot murkier since the business is based around AMD being able to integrate just the parts that a customer needs.

Polaris is a great example of this. Compared to Fiji (GCN 1.2), AMD revised the command processor, the display controller, the multimedia engines and the geometry processor. Meanwhile the all-important shader cores were technically revised, but in practice other than increased internal memory, they are ISA-identical to GCN 1.2. Finally, AMD did not touch the render backends, the rasterizer, or the work scheduler at all.

This means that Sony can equally pick and choose which parts of the GPU they want to update, which is important given the forward compatibility mandate of the PS4 Pro. Adopting features from Polaris does not mean that this is a full Polaris GPU.

Given the updated specifications of the console, I think it’s safe to assume that AMD has integrated their newer generation display engine and multimedia engine. The former is necessary to add support for HDMI 2.0 – critical for the console’s 4K display capabilities – while the latter is equally necessary to support 4K video decoding, including the most recent HEVC format that 4K services have been preferring.

Beyond that, however, there’s nothing that definitively points to the PS4 Pro’s SoC integrating other, newer components from Polaris. An updated memory controller would make a lot of sense if the memory clockspeeds are higher, but whether the shader cores or geometry engine have been touched are both very good questions. The PS4 has previously been described as using a GCN 1.1-era shader core, so it’s not impossible that it simply uses a larger version of such core (as opposed to Polaris’s GCN 4) to ensure compatibility. Essentially Sony & AMD’s options run the gamut from a truly updated PS4 SoC to a Polaris 10 stuffed into an SoC, and depending on Sony’s technical needs, both options would be valid.

Power Consumption, HDR, & Closing Thoughts

Finally, also on Sony’s official spec sheet is the maximum (“up to”) power consumption of the console. These values aren’t comparable to the TDPs we’re accustomed to with discrete video cards, but they’re useful for intra-PlayStation comparisons.

In this case, Sony has published that the PS4 Pro has an up to power consumption of 310W. We don’t have a similar official number for the original PS4, however its PSU is widely reported as being rated for up to 250W. Meanwhile we do have a similar number for the new slim PS4, which is 165W. So right off the bat we can see that the PS4 Pro’s maximum power consumption is significantly higher than its slim sibling, and still higher than its original 28nm generation counterpart.

Even with the move to 16nm, it’s not possible to improve an SoC in this fashion without increasing the power consumption. The GPU alone offers better than 2x the throughput of the 28nm console, and the Jaguar cores are clocked higher as well. Though it doesn’t look like we’re approaching the extreme power consumption of the likes of the original PlayStation 3, it’s clear that power consumption has gone up for the PS4 Pro, and that relative to the comparable slim PS4, there’s a significant power cost for the console’s much improved capabilities. Which is by no means unexpected, but it’s interesting to see Sony willing to build a bit bigger, bit more power hungry console than what they did with the original PS4.

Meanwhile, it’s worth pointing out that Sony has opted to equip the console with the same 6x BD-ROM drive as used in the other models, meaning that the PS4 Pro cannot play Ultra-HD Blu-Ray discs. Given Sony’s stake in the development of the Blu-Ray standards, this is a bit surprising. From a technical perspective I have no doubts that the SoC is capable of all of the necessary video decode and DRM responsibilities, as the requirements for streaming 4K services are similar, if not higher. So perhaps this is about licensing fees, or drive costs, or just that Sony is betting on the future of streaming over the future of optical disks.

Speaking of video, though I haven’t covered it in depth, HDR is a major focus for Sony as well. PS4 Pro obviously gets it, and thanks to the presence of HDMI 2.0, it gets the best support for it. Going by previous statements from AMD on GPU architectures, PS4 Pro should be fully capable of HDR for gaming, photos, and movies.

And in a surprise announcement, Sony also announced that they are backporting HDR support to the new slim PS4 and the original PS4. Looking again at our chart, we see how this can work: AMD’s older display controller (represented here by the Radeon 300 series) can support HDR, even over HDMI 1.4b. However there’s a bit more uncertainty in just what the older consoles can do with HDR.  In the dGPU space, the lack of HDCP 2.2 support has been cited by AMD as one of the reasons their older GPUs can’t support HDR movies. However other Sony statements have indicated that there will be HDR support for YouTube and Netflix on the older model PS4s. So just what are technical limitations and what are contract limitations is not clear. Presumably we’ll have a better answer next week whether the original PS4 has all of the Pro’s HDR capabilities (sans 4K) or if there are further limitations that just haven’t been made clear yet.

Wrapping things up then, alongside announcing the PS4 Pro console, Sony also announced a ship date and a price. A 1TB version of console will be hitting the streets on November 10th for $399, and preorders have already started. This is the same price that the original 500GB PS4 launched at nearly 3 years ago, and $100 more than the new $299 500GB slim PS4. The slim PS4 has of course already been fully disassembled, and it goes without saying that I’m looking forward to seeing what lies beneath the new PS4 Pro once it gets its own teardown treatment.

PlayStation 4 Pro: AMD’s Next Semi-Custom SoC Win
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  • aliquise - Friday, September 9, 2016 - link

    I've thought this is what made sense all the way since they picked APUs for the consoles to begin with.

    Why would they not use the latest and greatest APU? That would be completely stupid. Why hold back when it's a standard component which can easily be replaced?

    Just make some good standard settings for each console and slap an information box on the game description which tell which Playstation models are supported and you're fine.

    My PC is very different from a lot of others but we still can play about the same games and new PCs can play old games and old PCs can play new games as long as their performance is good enough.
    Reply
  • SunLord - Thursday, September 8, 2016 - link

    Why? its not replacing the PS4 the Pro will only offer better visuals and likely higher min FPS then Original and Slim at 1080p but will both play and have exact the same game as the Pro with just lower settings which is what you would of still gotten even if the Pro never existed. Outside of "4k" the only other thing the Pro will likely be better at then the PS4 is VR. Reply
  • Kevin G - Thursday, September 8, 2016 - link

    The last generation of consoles (PS3 and Xbox 360) had an extended life span two years longer than more consoles before their successors arriving. The PS4 Pro is a mild reset to that regular cadence (PS3 + PS4 -> is the correct time for PS4 Pro's arrival). Reply
  • Jumangi - Thursday, September 8, 2016 - link

    This isn't a new generation of console. It's clearly to the same level of performance jump that happens(2X+ GOU even less for CPU) because even Sony is still calling it the PS4. This is a new more iterative world for consoles. Only time will tell if it is accepted by the gaming market. Reply
  • RussianSensation - Thursday, September 8, 2016 - link

    Why? PS4 Pro and Xbox Scorpio are NOT next generation consoles because they will not have exclusive titles. Sony won't even allow multiplayer games to run at faster FPS on PS4 Pro than on the PS4. It would be completely different if these were true next generation consoles, that had their own exclusive game library in a way PS4/XB1 were compared to PS3/XB360. If existing PS4/XB1 owners want better graphics of these refresh consoles, they can just sell their old console and buy a new one, just like PC gamers upgrade CPUs/GPUs as games become more demanding. Reply
  • smartthanyou - Thursday, September 8, 2016 - link

    Betrayed? ROFL. Reply
  • goatfajitas - Thursday, September 8, 2016 - link

    I know right? If you dont want it, dont buy it... But "betrayed" is laying it on too thick. The old PS4 didnt suddenly lose functionality because a faster version came out. it's called progress. Reply
  • Morawka - Thursday, September 8, 2016 - link

    they are betrayed because they bought into a platform that has made some bad decisions on hardware. Sure they will have the fastest console for a year, but after that year is up, they are going to be sorely behind in graphics capability.

    The Xbox Project Scorpio will have exclusives to scorpio, i dunno why people think microsoft is following sony's strategy on this. they arent. What Microsoft did say is, all xbox one games will work on scorpio, and not the other way around.
    Reply
  • goatfajitas - Thursday, September 8, 2016 - link

    But that is how things work. If faster stuff doesnt come out, then we are all slow forever. Again, The old PS4 didnt suddenly lose functionality because a faster version came out. Faster computers are always out, faster phones, tablets, and pretty much everything else tech related improves over time. It's part of life. Getting upset over a new product that somewhat replaces a 3 year old product is ridiculous. Reply
  • Michael Bay - Friday, September 9, 2016 - link

    Value proposition for consoles always was a standartised level of quality for a long period of time. Now that goes out of the window, so of course they feel that way. Reply

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