AMD’s Zen 3 architecture is slated to land this year, setting the stage for a new wave of powerful chips based upon a newer version of AMD’s most successful architecture to date. The new Zen 3 microarchitecture will power AMD’s full lineup of next-gen chips, including the Ryzen 4000 «Vermeer» desktop processors that will soon vie for a spot on our list of Best CPUs, the Ryzen 5000 laptop chips, and the EPYC Milan data center processors. AMD plans to announce the first in-depth details of the new Zen 3 chips on 10/8/2020 at 10am PT.
AMD’s original Zen microarchitecture brought a fundamental rethinking of desktop processor design to market, and, in the process, saved the company from the cusp of bankruptcy. Zen-based «Naples» chips also paved the way for the chiplet-based designs that are now sweeping over the industry, and set a new bar for core counts and pricing in an industry that was long plagued by stagnant innovation from a single dominant player.
As impressive as AMD’s rapid success with Zen was, it was merely the first step along AMD’s multi-year roadmap. AMD’s solid follow-up with the Zen 2 architecture, which it paired with the 7nm process in the «Matisse» chips, cemented AMD’s dominance in pricing, performance scaling, and efficiency as Intel struggled to move on to its 10nm process. That triggered a massive turnaround in fortunes for the chipmaker as it continues to steal market share from Intel at an accelerating rate and has reached its highest stock valuation in history.
And now it’s nearly time for Zen 3 to come to market as Intel faces yet more delays in its move to 7nm. AMD says Zen 3 features an entirely new architecture. Paired with the expected instructions per cycle (IPC) throughput advances and the early signs of up to a 4.9 GHz boost, AMD may just have the magic bullet that finally upsets Intel from its position at the top of our gaming performance benchmarks.
Aside from an AMD presentation about the Zen 3 architecture that was accidentally posted to YouTube, the company hasn’t publicly shared specifics about the design. However, the company has shared plenty of information about Zen 3’s schedule, and a string of leaks has shed further light on the soon-to-be-released architecture. And we’ll learn the first in-depth details of the new Zen 3 chips on 10/8/2020 at 10am PT.
If one thing is for certain, the Zen microarchitecture has completely redefined our expectations for mainstream desktop chips, and it’s rational to expect more of the same with Zen 3. Let’s cover what we know about Zen 3 so far.
AMD Zen 3, Ryzen 4000 At A Glance
- TSMC N7P or N7+ process
- 32+ MB of unified L3 cache
- Multi-Chip Module (MCM) design
- Up to 64 cores for data center chips
- AMD will announce details about Zen 3 and Ryzen 4000 on 10/8/2020
- First client (desktop and/or laptop) chips arrive in late 2020
- EPYC Milan data center chips arrive in late 2020
- Full desktop, laptop and server Zen 3 lineups in market by the end of 2021
- Pricing is the wild card, but AMD has increased pricing with recent launches
AMD Zen 3 Ryzen 4000, Ryzen 5000, EPYC Release Dates
AMD Zen 3 Ryzen 4000, Ryzen 5000, EPYC Release Dates
Today we’re focusing on Zen 3 processors. Confusingly, AMD uses Ryzen 4000 branding for its current generation of Renoir APUs and laptop chips, but they come with the Zen 2 architecture. Zen 3 desktop processors will come with Ryzen 4000 branding, while Zen 3 laptop chips will have Ryzen 5000 branding.
AMD shared its latest roadmaps at its Financial Analyst Day 2020 as it outlined its continuing march ahead with new CPU microarchitectures and denser process nodes. Each step along the path promises step-function improvements, and AMD focuses on a predictable and reliable release cadence, all of which have been a challenge for Intel as it remains mired on the 14nm node for the desktop.
AMD’s Zen roadmap stretches out to the end of 2021, which the company has confirmed means that the entire roster of Zen 3 chips will be fully in the market by the end of next year. That includes the Ryzen 4000 Vermeer desktop PC chips, Ryzen 5000 laptop chips, and EPYC Milan processors.
As with AMD’s previous lineups, all of these chips share the same underlying scalable microarchitecture – in this case, Zen 3. AMD will use an «enhanced version» of TSMC’s 7nm process for the chips, but hasn’t clarified which specific version it will use. Zen 3 chips could use the N7P process, which still uses traditional DUV fabrication techniques but is 7% faster and 10% more power-efficient than the current 7nm process AMD uses for the Ryzen chips. AMD could also use the N7+ process that brings even bigger advantages (+15% performance, -10% power) borne of advanced EUV manufacturing. In either case, we expect much larger performance gains from Zen 3 than we see with the Ryzen XT models, but we’ll dive into that shortly.
AMD has consistently swatted away rumors that its Zen 3 chips are delayed and has clarified that its chips wouldn’t use TSMC’s 5nm process. AMD has long maintained that it’s Zen 3 chips would come to market this year, which makes sense given the Zen 3 EPYC Milan data center chips on the roadmap. The company later clarified that Zen 3 «client» chips would also come to market this year. That’s an important distinction, with the term «client» signifying that we’ll see chips for regular consumers this year, too.
The first Zen 3 consumer chips could land in the form of the long-awaited Ryzen 4000 ‘Vermeer’ processors. This would expand on AMD’s success in desktop PCs and render the Ryzen XT models a mere stop-gap between big product launches. Conversely, the first Zen 3 consumer chips could come to laptops as a fast follower to the company’s Ryzen Mobile chips. AMD’s latest mobile processors are just now taking hold in the market and have finally gained some traction, but a quick follow-up would cement AMD’s position as a serious contender in the mobile segment. Intel has its promising Tiger Lake mobile chips launching this year, too, so it would be a good time for a new line of Zen 3 mobile chips to counter Intel’s 10nm assault.
But there’s another possibility that makes plenty of sense. AMD’s restricts its current Renoir APUs to the OEM market only, though we did manage to get a 4750G chip in for review. AMD hasn’t outlined any plans to bring those chips to the retail market, but did promise it would support a future unspecified APU for 400-series and 500-series motherboards. AMD could shock us, yet again, and release a new APU as its first consumer Zen 3 chip. That would actually kill two birds with one stone: AMD uses its APU die for both the desktop PC and laptop markets. AMD’s next-gen APUs, codenamed Cezanne, have already popped up in benchmarks, implying they are moving closer to market.
Possibilities abound for the first consumer chips, but the data center side of the equation is simple: AMD says that EPYC Milan, the follow-on to the EPYC Rome chips, will arrive on time by the end of 2020. AMD’s EPYC Rome processors are already serious challengers for Intel’s Cascade Lake Refresh lineup, and the fast-follow with Milan will only intensify the competition. Intel should have its 10nm Ice Lake server chips on the market at that time, so competition will be stiff.
Perhaps most impressive, AMD’s roadmaps indicate the company will have its EPYC Genoa processors fully on the market by the end of 2022. Those chips will come with the 5nm process and Zen 4 architecture, and as such, we can also expect that AMD’s Zen 4 processors for the consumer market will come with the 5nm process as well.
AMD Zen 3 Ryzen 4000 and EPYC Milan Performance and Specifications
The jury is still out on the performance uplift we can expect from Zen 3 processors, but there are a few primary levers that AMD can pull to increase performance: The company could increase clock frequencies, increase Zen 3’s IPC, rework the caching hierarchy, or increase core counts. The company could make a plethora of other design changes, of course, but these represent the lowest-hanging fruit.
In terms of core counts, AMD’s own presentation last year for its Milan processors showed that the company would stick with a maximum of 64 cores. That means, barring an unlikely significant change late in the design process, AMD’s maximum core count will still weigh in at 64 cores for its data center and Threadripper 4000 processors for the high-end desktop (HEDT) market.
EPYC and Threadripper’s maximum of 64 cores doesn’t tell us much about the mainstream desktop, though. AMD’s Ryzen 9 3950X is currently the king of the mainstream desktop with 16 cores and 32 threads, but AMD’s Mark Papermaster told us that the company doesn’t see a «saturation point for cores» on the mainstream desktop in the near term.
That leaves open the possibility of more cores on the mainstream desktop for enthusiasts in the future, but whether or not those will come with Zen 3-based desktop chips is open for debate. We do know that the Zen 3 desktop chips will drop into the AM4 socket, though, and it might be possible for AMD to squeeze more cores into its mainstream Ryzen lineup (particularly if it uses a smaller node for the large IOD die).
A maximum of 64 cores doesn’t really hamper AMD’s Zen 3-based chips – the company already has an industry-leading helping of cores, and it doesn’t appear that Intel will be able to match 64 cores in the near future. However, Intel holds a big lead in the single-threaded performance, lending its Comet Lake chips a significant lead in the gaming department. Intel’s extra performance headroom will become more important as Nvidia rolls out it’s Ampere GPUs and AMD counters with its own Big Navi.
AMD can boost its per-core performance by increasing frequency and IPC, which will then boost Zen 3’s single-threaded performance. We already see signs of that with its forthcoming chips. Two Ryzen 4000 part numbers (OPNs) recently surfaced, and decoding these strings (100-000000065-04_ 46/36 _Y and 100-000000061-06_ 49/37 _Y) indicates a 16-core chip with a 3.7 GHz base that boosts to a beastly 4.9 GHz. That’s a 5.7% and 4.3% improvement on the base and boost clocks, respectively, and bodes well for increased frequencies with the Zen 3 processors.
All signs point to AMD sticking with PCIe 4.0 and DDR4 for the Ryzen 4000 desktop processors.
Part numbers for AMD’s Zen 3 EPYC Milan processors, which will power not only data centers but also a wide range of supercomputers, have also surfaced. These 64-core and 32-core models allegedly boost up to 3.0 GHz, but given that the existing EPYC Rome processors already boost as high as 3.9 GHz, these might be models with conservative TDP ratings for certain use-cases. That means we could see faster models in the future.
AMD Zen 3 Architecture and Specifications
Zen 3 Architecture
According to AMD’s Forrest Norrod, the Zen 3 architecture is completely new, but as with all architectures, it certainly inherits plenty of features from its predecessors.
AMD hasn’t shared any information on the new architecture, but an NDA presentation was accidentally uploaded to YouTube last year. AMD uses the same architectures for its desktop chips, so the EPYC Milan and Genoa presentation paints the broad strokes of what we can expect from the desktop chips.
AMD disclosed that it made a significant alteration to the cache alignments inside the chip. This indicates AMD is working to improve instruction per cycle (IPC) throughput and reduce latency, both of which are key focus areas for AMD as it evolves its architecture. AMD currently splits its chiplets into two four-core Compute Complexes (CCX), each armed with 16MB of L3 cache. For Milan, that changes to eight cores connected to a unified 32MB slice of L3 cache, which should eliminate a layer of latency within the compute die and increase cache hit rates. AMD lists the L3 cache as «32+» MB, which means we could see even larger cache clusters in either all, or some, of the new Zen 3 CPUs.
Much of the success of a processor design hinges on its ability to feed the execution cores with data (feeding the beast, as it were). Significant improvements in these areas will bring along an increase in IPC, giving us more performance gains than we would normally expect from a mere refresh generation. Pairing increased IPC with improved frequency from a faster and more mature variant of the 7nm process could provide some exceptional gen-on-gen performance gains, regardless if core counts remain static.
As noted above, EPYC Milan will feature the same maximum of 64 cores as the current-gen Rome models and drop into the same SP3 socket, meaning the chips are backward compatible with existing platforms. They’ll also come with the same support for eight channels of DDR4 and PCIe 4.0 and respect the base 120-225W TDP envelope, though it’s logical to expect higher-TDP variants like the 7H12 are also in the works. The chips also have two threads per core, silencing the rather dubious rumors that AMD would switch to four threads per core (SMT4) as we see with some competing data center chips.
The next-gen Milan chips still feature the same nine-die arrangement as the current-gen Rome models, with eight compute die and one I/O die, along with eight cores assigned to each compute chiplet.
Rumors have emerged that Zen 3 EPYC Milan will offer a 15% performance improvement in integer workloads and a 20% performance improvement in single-threaded workloads. Those rumors should be taken with a grain of salt and aren’t indicative of overall IPC performance improvements for the Zen 3 microarchitecture. Instead, they seem to quantify the performance of the overall EPYC Milan SoC.
Looking further into the future, AMD continues onward with its next-next-gen Zen 4 Genoa architecture that is already in the «definition phase.» The chip will drop into a new SP5 socket and land somewhere in the 2021-2022 time frame. The company says Genoa will come with «new memory,» likely meaning DDR5. We’re sure AMD is also considering a jump to PCIe 5.0.
AMD Zen 3 Ryzen 4000 Motherboards
With a new wave of chips about to crash down on the market, the first question on enthusiast’s minds is: Can I drop a Zen 3 Ryzen 4000 chip in my motherboard?
If you have a B550, X570, B450, or X470 motherboard, the answer is yes. Ryzen 4000 series processors will drop into the tried-and-true AM4 socket, and AMD will support the chips on the aforementioned chipsets. Enthusiasts with 300-series motherboards are left in the cold, though, but you’re probably better served by stepping up to more modern accommodations anyway.
The new BIOS revisions for existing 400-series boards will enable the full functionality of Zen 3 processors. However, you will still not gain access to the PCIe 4.0 interface on B450 and X470 motherboards (they don’t support the interface). AMD says the 400-series BIOS updates come as a one-way path: You can flash your motherboard to the new firmware, but you will not be able to flash back to previous BIOS versions that support pre-Zen 3 processors.
AMD will also require an as-yet-undefined process that verifies you have purchased a Zen 3 processor. AMD says that verifying a customer has purchased a Zen 3 processor is designed to prevent irreversible BIOS flashing issues, but AMD’s reasoning behind the forward-only flash requirement is unclear.
AMD’s updates also mark the end of the line for 400-series motherboards: AMD will not support future processors on the platform.
AMD Zen 3 Ryzen 4000 Price
AMD hasn’t shared any details on specific products yet, so we certainly can’t know how pricing will shake out. We still expect AMD to offer lower per-core pricing than Intel, but that doesn’t mean we’ll see the same delta between Intel and AMD pricing that we’re accustomed to.
AMD made some changes to its pricing scheme with the Zen 2 generation. These chips came with higher recommended price points than AMD’s previous-gen chips as the company positioned itself as a premium chip supplier as opposed to its long history as the value alternative.
AMD’s suggested pricing often has little to do with what we see at retail, and good deals abound on its current-gen chips. However, AMD’s current Ryzen XT lineup discarded one of the goodies we’ve become accustomed to – the higher-end models came without bundled coolers. We could see the company take a similar approach with Zen 3 processors.
AMD’s Zen 3 pricing will be largely predicated upon how it performs relative to Intel’s chips. Given the big performance gains we expect with the Zen 3 generation, it’s possible we could see higher per-core pricing than in the past and lose out on bundled coolers for the high-end models. Only time will tell, but we’ll update this article as we learn more.