AMD Zen 2 Microarchitecture Analysis: Ryzen 3000 and EPYC Rome
by Dr. Ian Cutress on June 10, 2019 7:22 PM EST- Posted in
- CPUs
- AMD
- Ryzen
- EPYC
- Infinity Fabric
- PCIe 4.0
- Zen 2
- Rome
- Ryzen 3000
- Ryzen 3rd Gen
Performance Claims of Zen 2
At Computex, AMD announced that it had designed Zen 2 to offer a direct +15% raw performance gain over its Zen+ platform when comparing two processors at the same frequency. At the same time, AMD also claims that at the same power, Zen 2 will offer greater than a >1.25x performance gain at the same power, or up to half power at the same performance. Combining this together, for select benchmarks, AMD is claiming a +75% performance per watt gain over its previous generation product, and a +45% performance per watt gain over its competition.
These are numbers we can’t verify at this point, as we do not have the products in hand, and when we do the embargo for benchmarking results will lift on July 7th. AMD did spend a good amount of time going through the new changes in the microarchitecture for Zen 2, as well as platform level changes, in order to show how the product has improved over the previous generation.
It should also be noted that at multiple times during AMD’s recent Tech Day, the company stated that they are not interested in going back-and-forth with its primary competition on incremental updates to try and beat one another, which might result in holding technology back. AMD is committed, according to its executives, to pushing the envelope of performance as much as it can every generation, regardless of the competition. Both CEO Dr. Lisa Su, and CTO Mark Papermaster, have said that they expected the timeline of the launch of their Zen 2 portfolio to intersect with a very competitive Intel 10nm product line. Despite this not being the case, the AMD executives stated they are still pushing ahead with their roadmap as planned.
AMD 'Matisse' Ryzen 3000 Series CPUs | |||||||||||
AnandTech | Cores Threads |
Base Freq |
Boost Freq |
L2 Cache |
L3 Cache |
PCIe 4.0 |
DDR4 | TDP | Price (SEP) |
||
Ryzen 9 | 3950X | 16C | 32T | 3.5 | 4.7 | 8 MB | 64 MB | 16+4+4 | 3200 | 105W | $749 |
Ryzen 9 | 3900X | 12C | 24T | 3.8 | 4.6 | 6 MB | 64 MB | 16+4+4 | 3200 | 105W | $499 |
Ryzen 7 | 3800X | 8C | 16T | 3.9 | 4.5 | 4 MB | 32 MB | 16+4+4 | 3200 | 105W | $399 |
Ryzen 7 | 3700X | 8C | 16T | 3.6 | 4.4 | 4 MB | 32 MB | 16+4+4 | 3200 | 65W | $329 |
Ryzen 5 | 3600X | 6C | 12T | 3.8 | 4.4 | 3 MB | 32 MB | 16+4+4 | 3200 | 95W | $249 |
Ryzen 5 | 3600 | 6C | 12T | 3.6 | 4.2 | 3 MB | 32 MB | 16+4+4 | 3200 | 65W | $199 |
AMD’s benchmark of choice, when showcasing the performance of its upcoming Matisse processors is Cinebench. Cinebench a floating point benchmark which the company has historically done very well on, and tends to probe the CPU FP performance as well as cache performance, although it ends up often not involving much of the memory subsystem.
Back at CES 2019 in January, AMD showed an un-named 8-core Zen 2 processor against Intel’s high-end 8-core processor, the i9-9900K, on Cinebench R15, where the systems scored about the same result, but with the AMD full system consuming around 1/3 or more less power. For Computex in May, AMD disclosed a lot of the eight and twelve-core details, along with how these chips compare in single and multi-threaded Cinebench R20 results.
AMD is stating that its new processors, when comparing across core counts, offer better single thread performance, better multi-thread performance, at a lower power and a much lower price point when it comes to CPU benchmarks.
When it comes to gaming, AMD is rather bullish on this front. At 1080p, comparing the Ryzen 7 2700X to the Ryzen 7 3800X, AMD is expecting anywhere from a +11% to a +34% increase in frame rates generation to generation.
When it comes to comparing gaming between AMD and Intel processors, AMD stuck to 1080p testing of popular titles, again comparing similar processors for core counts and pricing. In pretty much every comparison, it was a back and forth between the AMD product and the Intel product – AMD would win some, loses some, or draws in others. Here’s the $250 comparison as an example:
Performance in gaming in this case was designed to showcase the frequency and IPC improvements, rather than any benefits from PCIe 4.0. On the frequency side, AMD stated that despite the 7nm die shrink and higher resistivity of the pathways, they were able to extract a higher frequency out of the 7nm TSMC process compared to 14nm and 12nm from Global Foundries.
AMD also made commentary about the new L3 cache design, as it moves from 2 MB/core to 4 MB/core. Doubling the L3 cache, according to AMD, affords an additional +11% to +21% increase in performance at 1080p for gaming with a discrete GPU.
There are some new instructions on Zen 2 that would be able to assist in verifying these numbers.
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The_Assimilator - Wednesday, June 12, 2019 - link
The original version of this article noted the 3950X price wasn't confirmed at the time of publication, but it seems they edited that bit out after Su's presentation.Still need the table to be updated - PCIe and DDR4 columns at least.
vFunct - Tuesday, June 11, 2019 - link
Eventually these Multi-chip packages should incorporate system DRAM (via HBM) as well as SSD NVRAM and GPUs, and sold as full packages that you'd typically see in common configurations. 64GB memory + 1TB SSD + 16 CPU cores + whatever GPU.mode_13h - Tuesday, June 11, 2019 - link
GPUs are often upgraded more often than CPUs. And GPUs dissipate up to about 300 W, while desktop CPUs often around 100 W (except for Intel's Coffee Lake).So, it wouldn't really seem like CPUs and GPUs belong together, either from an upgrade or a cooling perspective. Consoles can make it work by virtue of being custom form factor and obviously you don't upgrade a console's GPU or CPU - you just buy a new console.
Therefore, I don't see this grand unification happening for performance-oriented desktops. That said, APUs will probably continue to get more powerful and perhaps occupy ever more of the laptop market.
Threska - Tuesday, June 11, 2019 - link
I imagine that's why there's PCIe 4.0 and now 5.0.R3MF - Tuesday, June 11, 2019 - link
memory support?3200 official, or higher...
SquarePeg - Tuesday, June 11, 2019 - link
According to AMD 3200mhz is officially supported but they (AMD) have had memory clocked to over 5000mhz. Infinity fabric will run 1:1 with up to 3733mhz ram but any higher and it splits to 2:1. AMD also said that they have found DDR4 3600 16-21-21 to be the best bang for buck on performance returns.R3MF - Wednesday, June 12, 2019 - link
cheersGastec - Wednesday, June 12, 2019 - link
But will those be 3200 MHz overclocked (XMP) or 3200 SPD?Cooe - Wednesday, June 12, 2019 - link
The latter. Only >3200MHz is now overclocked.Lord of the Bored - Tuesday, June 11, 2019 - link
That security slide, though...Most of a page of "N/A"
I love it.