A few months ago near the start of E3, Sony made an interesting revelation: that they would be releasing a higher performing PlayStation 4 console. A console intended to complement the standard/slim model, this faster PlayStation would be an unusual – if unprecedented – mid-generation update of sorts for Sony’s console family. Previous generations of consoles have offered add-ons, but a significantly faster model is something else entirely.

In any case, after much speculation and a fair bit of analysis on how the PlayStation 4 ecosystem would work with multiple models, in an event in New York City this afternoon, Sony announced the new console. Dubbed the PlayStation 4 Pro, it would sit alongside the newly launched slimmer PS4 (an original PS4 with a die shrunk SoC) as a premium, more powerful entry in the PlayStation 4 family. The console  is intended to cover a spectrum of use cases for Sony, including 4K TV support, HDR, better VR performance, and higher fidelity graphics on today’s 1080p TVs.

As AnandTech is not a gaming website, I’m going to skip the gaming ramifications. Instead, let’s do what we do best and dive into the hardware.

PlayStation 4 Pro: AMD’s Next Semi-Custom SoC Win

A bit to my surprise, Sony actually released some basic specifications about the underlying hardware. The information is similar to what we were given close to the PS4 launch, but at the same time I wasn’t expecting this information until we were closer to the PS4 Pro’s November launch.

Sony PlayStation 4 Spec Comparison
  PlayStation 4 (OG) PlayStation 4 (Slim) PlayStation 4 Pro
CPU Cores/Threads 8/8 8/8 8/8
CPU Frequency 1.6GHz 1.6GHz > 1.6GHz
CPU µArch AMD Jaguar AMD Jaguar AMD Jaguar
Shared L2 Cache 2 x 2MB 2 x 2MB 2 x 2MB?
GPU Cores 1152 (18 CUs) 1152 (18 CUs) 2304 (36 CUs)?
Peak Shader Throughput 1.84 TFLOPS 1.84 TFLOPS 4.20 TFLOPS
System Memory 8GB 5.5 Gbps GDDR5 8GB 5.5 Gbps GDDR5 8GB ? Gbps GDDR5
System Memory Bus 256-bits 256-bits 256-bits
System Memory Bandwidth 176.0 GB/s 176.0 GB/s 176.0 GB/s?
Optical Drive 6x BD 6x BD 6x BD
Power Consumption
(Up To)
250W? 165W 310W
HDMI 1.4 1.4 2.0
Manufacturing Process 28nm 16nm? 16nm?

With a focus on increased performance, the heart and soul of the PS4 is a new, higher performance SoC from AMD. One of AMD’s semi-custom design wins for H2’16, Sony has released certain details that help paint a useful, though not quite complete picture of what this SoC can do.

On the CPU side, Sony is not officially discussing clockspeed. However they have confirmed that it is still an 8 core Jaguar design like the original PlayStation, so there are no additional CPU cores in play. Furthermore the CPU clockspeed has been boosted by an undisclosed amount, so total CPU performance has increased.

While I have some ideas on what those numbers may be, it does depend in part on how much work AMD put in on the semi-custom stage of the design process. The newer manufacturing process – which I believe to be TSMC’s 16nm since that is AMD’s regular semi-custom fab partner – certainly delivers some benefits. But at the same time the Jaguar architecture was not originally designed to scale to very high clockspeeds – keep in mind that this was a low power architecture to begin with – so there are frequency bottlenecks besides simple silicon limits. For reference, the fastest desktop Jaguar desktop processor topped out at 2.2GHz. Unless AMD has done any major reworking of Jaguar for Sony, that is about as good of a guess as we can make, short of Sony confirming any numbers.

Meanwhile on the GPU side, things get a lot more interesting. The PS4 Pro’s SoC features a far more powerful integrated GPU, more than doubling the rated performance of the original PS4. Overall the PS4 is rated for 4.2 TFLOPs, versus 1.84 TFLOPs on the original console. In terms of raw throughput, this is to AMD’s current-generation mainstream discrete GPUs, offering throughput somewhere between the RX 470 (4.9 TFLOPs) and the R9 380X (4.0 TFLOPs).

The significant increase in GPU performance is easily the biggest selling point of the new console, and is the cornerstone of Sony’s plans to pitch the console as a higher fidelity alternative to the stock PS4. This includes both higher quality rendering (e.g. more objects, better shadows, etc) and higher framerates, but also higher resolutions as well as part of Sony’s greater push to make the PS4 Pro synonymous with 4K.

As far as the GPU configuration goes then, officially we don’t have anything to work with besides the raw throughput. Clockspeeds and CU counts are both very good questions right now, as the jump to 16nm will have improved both AMD’s ability to pack in more CUs in a given area, and, at least to some extent, rev up the clockspeeds. So how AMD has opted to balance these factors is an interesting question.

Given that GPU throughput has increased by 2.3x, my hunch is that AMD has pushed both aspects. A straight doubling in the CU count coupled with a modest (14%) increase in the GPU clockspeed would reach the stated performance numbers without too radical of an alteration of the GPU architecture. But there’s a lot of wiggle room here; it could just as easily be 34 CUs at a higher clockspeed, for example. A wider design favors power efficiency – which is always a boon in a console – but as 16nm is still a newer process, it’s a chip yield risk.

Meanwhile, it’s important to note here that as we’ve seen in the discrete GPU space, shader throughput is not everything. Shaders are indeed frequently the biggest bottleneck to GPU performance, but they are hardly the only one. One way or another AMD has greatly increased the shader throughput of their SoC, but rather they’ve increased the unit counts on any other aspects remains to be seen. Whether they’ve added additional geometry units or ROPs could significantly influence the performance of the console, as it’s going to be relatively harder to fill up those expanded shader resources if these other resources weren’t similarly expanded. At the same time we don’t know anything about how the GDDR5 memory is clocked; I think it’s a safe bet that it’s clocked higher since the original console was only at 5.5Gbps, but even 7Gbps memory would only be 27% more memory bandwidth to feed a much wider GPU. In short, it’s best not to assume that all aspects of the GPU have been doubled, and consequently that the real world performance advantage for the PS4 Pro is not going to be quite as great as the GPU specs indicate.


Slim PS4 next to PS4 Pro

On that note, while Sony is pitching the console for 4K video and gaming, Mark Cerny was rather clear that to reach 4K gaming, they expect developers to make significant use of both spatial and temporal anti-aliasing/reprojection.to reach 4K. In other words, most of the time the console won’t actually be rendering games at 4K. This makes a lot of sense; all else held equal, the PS4 Pro needs to fill 4x as many pixels with a GPU that’s (at best) 2.3x as powerful.

This means that the number of games that natively render at 4K is by necessity going to be relatively few. Games could still render at resolutions over 1080p (e.g. 2560x1440), giving them more fidelity than current 1080p games, but various upscaling/reprojection methods will have to close the gap to 4K. Given that even the best PC GPUs have only recently reached the performance level to render the necessary 8.3Mpixels without significant quality compromises, and we’re likely a generation (or more) from consoles being able to reach that same level.

The Polaris Connection & Closing Thoughts
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  • 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

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