Analyzing Sony’s PlayStation 4 Pro Hardware Reveal: What Lies Beneathby Ryan Smith on September 8, 2016 8:00 AM EST
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 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|
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.
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.
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Samus - Thursday, September 8, 2016 - linkThe thing is, will developers actually take advantage of the additional CU's at the possible expensive of screwing up the gameplay on older consoles.
The definitive benefit of consoles has always been consistency. With the exception of the N64 RAMBUS memory upgrade and possibly the 32x for Genesis, now that they are making huge advancements within console generation revisions toward performance, do developers make two games modes (low quality and high quality) and how will this alienate players? I think the Xbox refresh was a little more straightforward with a mild update...but Sony effectively doubling the performance makes this outrageously bias, and even if they update their development platform to assist with multi console consistency, where do developers draw the line.
We may think future titles will have the line drawn at graphics quality. But don't forget how poorly titles that depended on upgrade components (Turok 2 for N64 comes to mind) just for basicfeatures like split screen multiplayer; the long term concern is the Pro's existence is going to make dev's lazy at optimization for the OG hardware, with the excuse "everyone needs to just upgrade"
Time will tell.
The reason this is an issue is because unlike PC gaming, the older PS4 is not upgradable to new PS4 specs. It isn't s mild $200 videocards upgrade (where you can sell your old $100 videocard) it's a $400 Replacement where you can sell your old $200-$300 previous console.
Wolfpup - Thursday, September 8, 2016 - linkThe Gameboy Color, the DSi, and the New 3DS also probably qualify (the former and latter espectially).
There were actually Gameboy games that ran poorly on the original GB versus the color (Megaman X was pretty good on GBC, really terrible on GB, for example), and someone on here said Hyrule warriors runs at only 15fps on the original 3DS.
Soooo...we'll have to see.
I'm STILL not sure how I feel about updates like this, and I'm still not really clear on what the Xbox One S is (since it actually DOES have upgraded hardware that can make a difference in games) nor Scorpio.
Wolfpup - Thursday, September 8, 2016 - linkThanks so much for this article! Unsurprisingly, it's 52 billion times more informative than anything else I've seen about the Pro.
I'm kind of disappointed it doesn't have 4K Blu Ray support. Weird, given as I understand it, the Xbox One S DOES. I'm hooking up a 4K/HDR TV soon, so I'd like 4K Blu Ray anyway...
Lolimaster - Thursday, September 8, 2016 - linkIn the event they said "with the help of the polaris arq" so it's not just a bumped up HD7000 gpu.
webdoctors - Thursday, September 8, 2016 - linkSweet GPU horsepower on that thing! Its good for PC gamers, as now developers will invest in decent graphics.
I was already betrayed when my XBOX 360 S wasn't supported by games like GTA V and Needs for Speed Rivals, because of the lack of an internal HDD so I'm OK with more splintering. Just stick to PCs.
Alexvrb - Thursday, September 8, 2016 - linkRyan: Regarding clockspeeds of the CPU cores... there's very little difference between Jaguar and Puma/Puma+. The main difference is higher clocks. So who is to say that they're not using a fast Puma core? Did they explicitly say they're using Jaguar cores? That seems silly. Puma in the embedded Steppe Eagle line is up to 2.4 in a quad core, at 25W - and that's on 28nm. Basically it's too early to tell. They might have kept it conservative to save power and make room for more GPU horsepower at a given TDP. Or they might have gotten a little aggressive to make more headroom for devs, and hit 2.5+. I would bet the former but in either case the clocks won't be limited to a low-2's range just because it's a cat-core.
Ryan Smith - Friday, September 9, 2016 - link"Did they explicitly say they're using Jaguar cores?"
Yes. The exact text is, and I quote: 'CPU: x86-64 AMD "Jaguar", 8 Cores'
And I should note that everything in that spec table that doesn't have a question mark besides it is confirmed. So the power, the GPU throughput, memory capacity, etc.
ruthan - Thursday, September 8, 2016 - linkThis analysis is much worse than old Digital Foundry analysis.. Anandtech is nowdays, good only for new architecture / lineup CPU analysis and new Apple devices performance analysis once per year and sometimes for some ARM / iOS comparison, otherwise days of AT glory are gone..
hrishi.baba - Saturday, September 10, 2016 - linkWhich other site you prefer??
KoolAidMan1 - Friday, September 9, 2016 - linkNo UHD Blu Ray is surprising and disappointing