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
POST A COMMENT

207 Comments

View All Comments

  • nathanddrews - Thursday, September 8, 2016 - link

    Some of my fondest console memories are GoldenEye N64 multiplayer (15fps), Perfect Dark N64 multiplayer (9fps), Vigilante 8 (15fps), Twisted Metal (20fps), Halo Xbox multiplayer (15-30fps). I mean... a LOT of hours and so much fun. Likewise, I have plenty of console memories that were 60fps. Fun games are fun, period. I played just as much UT99 at 160fps on my CRT monitor as I played Perfect Dark at 22fps and loved them both.

    Funny thing is that now that I've played the PD remake on XBLA, the 60fps lock makes it almost unplayable... I'm terrible at it. LOL
    Reply
  • Wolfpup - Thursday, September 8, 2016 - link

    I'm fine with 30FPS, and dipping down from that, but I couldn't handle a lot of N64 games because of the horrific framerates. Banjo 2 didn't run well enough for me to play it (although also it's way too hard, aside from that). Although in Banjo 2's case, I have to wonder if it was designed for 8MB, and then they shoehorned it in to 4MB, because Banjo 1 and Donkey Kong 64 ran solidly... Reply
  • nathanddrews - Friday, September 9, 2016 - link

    It's possible, I know that a few games late in the N64 cycle basically required the memory expansion pack. Perfect Dark actually ran OK in single player without the high resolution textures enabled, but once you turned it on and in 4-player split screen, the frame rate really tanked. I guess I put up with it because my friends and I had so much fun getting together to play it. None of them were into PC gaming, so they had no frame of reference for how smooth gameplay could be. Reply
  • Kevin G - Thursday, September 8, 2016 - link

    The problem is that VR is the 'next big thing' and that necessitates higher frame rates. With the PS4 Pro being positioned for VR, hitting 60 FPS is more of a requirement. Reply
  • JeffFlanagan - Thursday, September 8, 2016 - link

    90fps is considered a requirement for VR. At 60fps, more people would get VR sickness. Reply
  • Huacanacha - Thursday, September 8, 2016 - link

    60fps is viable with reprojection (to put in crudely: redisplaying frames adjusted for headset orientation and/or position changes), which I think is the point of the 120Hz PSVR max refresh rate. Very few if any games will be 120fps native, they will either be 60fps with reprojection (for 120Hz output) or 90Hz native. There may be 45fps with reprojection but that's probably getting into bad VR experience territory for most styles of games. Reply
  • Wolfpup - Thursday, September 8, 2016 - link

    Yeah...HMMMMMMMMMMM. I'm seriously wondering how Sony thinks they can pull this off. Is even the Pro enough hardware to really do VR? They'd really need to do 90FPS at whatever resolution PlayStation VR is, and I'm not sure the Pro can do that, much less the original... Reply
  • kn00tcn - Thursday, September 8, 2016 - link

    you people... hardware has nothing to do with performance in that way, the decision to put a certain amount of graphics is the performance target

    killzone3 had 3D on a ps3, but your logic implies that's impossible since kz3 looks so good & is 30fps with dips in the first place... of course the reality was that graphics was adjusted, why would a dev be stupid enough to run their VR game at 15fps? it's entirely up to them, not the hardware
    Reply
  • Death666Angel - Friday, September 9, 2016 - link

    3D isn't the same as VR, please get informed. Reply
  • kn00tcn - Thursday, September 8, 2016 - link

    people want small quiet devices, developers want to make visuals, console companies want to hit both targets & be sanely priced, but why are they the ones getting blamed?

    there are plenty of 60fps games btw, seems more than last gen, sounds like consoles already changed for the better
    Reply

Log in

Don't have an account? Sign up now