AMD announces Zen 2 CPUs, feat. 12-core Ryzen 9 3900X

May 27, 2019 | 06:01

Tags: #3rd-gen-ryzen #computex-2019 #octa-core #ryzen #ryzen-7-3700x #ryzen-7-3800x #ryzen-9 #ryzen-9-3900x #zen-2

AMD President and CEO Dr. Lisa Su has used her Computex 2019 opening keynote to unveil three new CPUs built using the 7nm Zen 2 architecture, including the first 12-core CPU to arrive on mainstream platforms.

First officially teased at CES 2019, Zen 2 is the architecture that will be powering 3rd Gen AMD Ryzen CPUs, which will also be the third generation of CPUs compatible with the Socket AM4 ecosystem and motherboards. With it, AMD reckons it has achieved a 15 percent IPC (instructions per clock) uplift that will bring a universal performance uplift, and it also claims to have doubled the cache size (particularly beneficial to gaming) and delivered twice the floating point performance (important for creative workloads) – naturally, you can expect more technical details on these pages at launch if not before.


AMD Ryzen 9 3900X AMD Ryzen 7 3800X AMD Ryzen 7 3700X Ryzen 5 3600X Ryzen 5 3600
Cores/Threads 12/24 8/16 8/16 6/12 6/12
Base Clock 3.8GHz 3.9GHz 3.6GHz 3.8GHz 3.6GHz
Boost Clock 4.6GHz 4.5GHz 4.4GHz 4.4GHz 4.2GHz
Total Cache 70MB 36MB 36MB 35MB 35MB
TDP 105W 105W 65W 95W 65W
MSRP $499 $399 $329 $249 $199

Launching on July 7th 2019, 3rd Gen AMD Ryzen CPUs will also see AMD hit bring 7nm to the mainstream desktop space before Intel is able to move beyond 14nm, and they will also come with PCIe 4.0 support, again for the first time in this space. Thus far, five CPUs have been confirmed, including the 12-core one which launches a new family: Ryzen 9. The high-level specs of these can be seen in the table above.

Starting with the cheapest confirmed CPU, the 8C/16T Ryzen 7 3700X ($329), AMD has pitched it against Intel’s 8C/8T Core i7-9700K ($410), promising performance that is one percent faster in Cinebench R20’s single-threaded workload and 28 percent faster in the multi-threaded workload – despite a 30W lower TDP.

Next is the 8C/16T Ryzen 7 3800X ($399), which AMD says is faster than the Ryzen 7 2700X by 11-34 percent in popular games and slightly faster than Intel’s current equivalent flagship, the 8C/16T Core i9-9900K ($495), at least in Cinebench R20 multi-threaded. Remember, though, Intel’s CPU has a 10W lower TDP in this comparison. Also, no comparison was made (understandably) to the upcoming Core i9-9900KS, which seems likely to beat the Ryzen 7 3800X in the same workload thanks to the all-core 5GHz Turbo. The TDP of that chip, however, is currently unknown.

The star of the show is the 12C/24T Ryzen 9 3900X, which is where the 7nm process really comes into its own. It allows AMD to squeeze two chiplets onto the same package alongside the I/O die that’s built on a different, older process. How the cores are divided between the chiplets is currently unknown, but what AMD did reveal pertains of course to Cinebench R20, specifically 14 percent and six percent gains in the single-threaded and multi-threaded workloads respectively versus the 12C/24T Core i9-9920X, a CPU that is currently $1,200 and has a 60W higher TDP than the new Ryzen chip.

No mention was made of a 16-core/32-thread chip, but the full lineup does include two new 6C/12T Ryzen 5 CPUs as well.

The 3rd Gen AMD Ryzen CPUs will launch alongside the X570 chipset, with AMD claiming there are at least 56 boards ready for launch. Based on Socket AM4 still, X570 is compatible with older AM4 Ryzen CPUs, and on the flip-side AMD says over 100 older AM4 boards are ready (via BIOS updates) for 3rd Gen Ryzen. That said, X570 will be the only chipset that’ll support PCIe 4.0 (40 lanes in fact) and will thus be what you need to get the most out of X570. It’s also unclear how older boards will handle the new higher-core-count CPU (or CPUs?), but we’re expecting to find out a lot more about X570 from AMD’s various motherboard partners here at Computex 2019.

Dr. Lisa Su also shared some preliminary details about Rome, AMD’s 2nd Gen Epyc processor, which will be built on the same 7nm process and Zen 2 architecture as the Ryzen 3000 Series. It showed off a CPU running with 64 Zen 2 cores (128 threads) spread across eight chiplets, or more accurately it showed off two of them running together. In a molecular dynamics workload, this combination outperformed a dual-socket Intel Cascade Lake system featuring two Xeon Platinum 8280 CPUs, each with 28 cores and 56 threads by more than double. The 2nd Gen Epyc processor family is set to launch in Q3 2019.


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