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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  • nikon133 - Sunday, September 11, 2016 - link

    I'm pretty sure Kazuo Hirai mentioned on PS4 release that there might never be a PS5. I remembered that because it sounded very... gloomy. Reflecting on that now, it is very possible that Sony plans to release upgraded versions for unforeseen time, staying within same number. PS4 Ultra. PS4 Trinity. PS4 TurboFX. Or just "new PlayStation" in the future.

    Additionally... this is the first dual-config setup they have and they are introducing it carefully. Trying not to alienate many gamers. Thus promise that there will be no extra from games on PS4 Pro beside better visuals. When next upgrade is released, they might loosen or drop this requirement. Yes, devs can make game run differently on next PS4. Have more players in multiplayer. Have bigger maps. Extra content.

    Sticking with x86 platform, they can easily keep backward compatibility... but they can even completely drop forward compatibility, or let it to devs to decide. Next PS4 can be made to run all the old PS4 games, but older PS4 versions might not necessarily be able to run all new games.

    Achilles heel of consoles' generational changes in the past was usually introduction of new platform, where there are not many games at start, and not many gamers to motivate devs into fully focusing on developing them. They usually have sort of slow start, before they ramp up. With backward compatibility, this problem is pretty much gone. Enough games to play before new exclusive content starts coming up.
    Reply
  • gopher1369 - Monday, September 12, 2016 - link

    I'm holding out for the Super Ultra Mega Playstation 4 Turbo 64 Championship Edition. Reply
  • Wolfpup - Thursday, September 8, 2016 - link

    Wow, I didn't know Hyrule Warriors (or any games) were actually being optimized for New 3DS!

    This is sort of similar to the Gameboy > Gameboy Color situation too (and there were actually games that ran VERY poorly on the original Gameboy).

    Will be interesting to see how this plays out...
    Reply
  • cmdrdredd - Thursday, September 8, 2016 - link

    This is already fleshed out. New games that are patched or designed for the pro run above 1080p and are scaled to 4k with many of them being HDR. For people with 1080p[ Tvs and the pro the framerate will be higher, more stable, or both. All games must have 100% compatibility with the original PS4 and it will also support HDR. Reply
  • Colin1497 - Friday, September 9, 2016 - link

    I've been speculating this same thing for both PS and XB since the rumors started last year. If well executed this could work just fine. Time will tell. Reply
  • rarson - Friday, September 9, 2016 - link

    I think PS5 will replace the entire PS4 platform, just like it would have in a traditional console cycle, with an upgraded PS5 coming a few years later to extend the entire PS5 platform like the Pro does for the PS4. Reply
  • goatfajitas - Thursday, September 8, 2016 - link

    "As a PS4 owner since its launch I feel betrayed with this PS4 Pro release. Its been released way too early!"

    I am really not getting that at all. I am a PS4 owner and am glad the PS4 pro is coming. We get better graphics if we want. If not, the old one still works with all the latest games. it has 4.2 tflops of GPU goodness. that puts it between the Geforce 970 and 980. That is pretty damn impressive for a console.
    Reply
  • SwaggerLIlyJohnson - Thursday, September 8, 2016 - link

    4.2 tflops is also right behind a 7970 ghz edition tflops can be misleading. Reply
  • goatfajitas - Thursday, September 8, 2016 - link

    It's a simple static rating that can be expressed in a single sentence rather than 10 pages of benchmark graphs... So, yeah, it's not everything... Its not good comparing against different generations of cards years apart, but comparing like to like, the PS4 has 1.8 tflops, where the PS4 Pro has 4.2 Reply
  • tipoo - Friday, September 9, 2016 - link

    Polaris is also up to 40% more efficient per core per clock than GCN 1, PS4 seems to use a hybrid of 1.1 and 1.2 with the 8 ACEs. Reply

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