Having released the first processors based on Zen architecture, AMD not only returned to the technology race but also stirred up the market. The main competitor immediately stopped doing the same thing with slightly improved performance and engaged in an effective increase in productivity. Modified processors based on Zen 2 had to solve the remaining problems of "red". On the occasion of the release of the 3000 series Ryzen answer the most important questions.
Key differences between Zen and Zen+ from Zen2
The processor was divided into chipsets: instead of a monolithic crystal of cores and an integrated north bridge (memory and input-output controller), now there are three "pieces". Two of them are 7-nm computing cores with an input-output unit, as well as a 14-nm memory controller. The Infinity Fabric bus, which previously combined all this in one crystal, was laid out on a substrate. As a result, nothing seems to have changed for the system: processors after updating the BIOS are compatible with old motherboards. But the CPU itself has become much faster. Internal optimizations yielded a 21% performance increase in single-threaded tasks compared to Zen 1.
To eliminate the "bottlenecks" associated with the division of the processor into three modules, AMD engineers have more than doubled the available amount of cache memory - the top model will have up to 70 MB of L3 cache. This solution, of course, makes the production of processors more difficult and more expensive but reduces delays in I/O operations and the dependence of CPU performance on the speed of working with RAM.
New in Zen 2
In addition to improvements in the layout, Zen 2 received a whole new technology. The key one is PCI Express 4.0 with a twofold increase in speed compared to version 3.0 per line. This high-speed parallel interface has actually become the standard for connecting peripherals. And if the performance of video cards is not affected by an upgrade, then for a slow data storage subsystem the doubled speed of data exchange with the RAM and the processor. Moreover, Gigabyte has already shown an SSD array with a read speed of up to 15 GB/s, using 4 PCI E 4.0 lanes. And Phison has single-chip models with a read speed of 5 GB/s and write - 4 GB/s. For comparison, the top models on PCI E 3.0 at best give out 3 - 3.5 GB/s.
AMD came up with another important solution - they transferred the internuclear and interchip "communication" inside the chip to the new IF 2.0 bus. If before it was tied in frequency to a memory controller, now it has a frequency divider and asynchronous mode. When overclocking RAM to frequencies higher than 3800 MHz, the memory controller operates at half the frequency of IF 2.0.
So if you need ultra-fast memory and access delays are not very important, you can go beyond the insurmountable overclocking barrier in the past. However, AMD itself recommends the use of modules with a frequency of no higher than 3600 MHz - with them the operation of the system is optimal both in the speed of linear operations and in access delays to memory banks.
It’s hard to take and say “productivity has grown by so many percents.” Because the internal structure of the CPU, the architecture for interacting with memory, the cache and process volumes, as well as the operating frequencies, have changed. Only AMD engineers know which parameters significantly influenced the speed of calculations, and which minimally improved the results. We will rely on their experience.
The overall performance gain relative to Zen+ in the 2000 series was 21%. Approximately 13% gave architectural changes in the core of Zen 2, and about 8% - translation to 7-nm process and support for higher clock speeds at full load. The results of the dispersal also increased on all fronts. The CPU has increased the number of power and temperature control points. Now the system knows the state of the processor better - that is, it can run in maximum performance mode more often.
The improved topology of the crystal, splitting it into three functional units and upgrade the tires Infinity Fabric enable you to squeeze out of the CPU on average on a 200 MHz higher than would be possible if a simple translation of the Zen+ to 7 nm. In addition, the x570 chipset supports new CPU overclocking tools both in UEFI mode and when Windows is loaded. In the first case, the menu was cleaned and arranged for ease of operation, in the second - made it easier to control and configure on an already running system.
What is it all for?
The separation of the crystal into "pieces" reduces defects in production and tightens product characteristics: iron is faster, acceleration is more efficient, prices are more variable. And new drives based on PCI Express 4.0 will make downloading games almost instant. As well as working with software that relies on reading from disk.
Models, variants and provisional price
At the start of sales, they promise the next alignment of forces. The senior will be the Ryzen 9 3900X - 12 cores and 24 threads at a base frequency of 3.8 GHz, but with auto-acceleration up to 4.6 depending on load. The Ryzen 7 line will include two eight-core. Ryzen 5 will be six-core, while the younger models with graphics, Ryzen 5 3400G (with solder under the lid) and Ryzen 3 3200G (with plastic thermal interface), will remain on the old Zen+ architecture. The flagship 16-core Ryzen 9 3950X will go on sale in the fall, presumably in September.
RYZEN 9 3900X
12 CORES, 24 THREADS 3.8-4.6 GHZ
38 500 ₽
RYZEN 7 3800X
8 CORES, 16 STREAMS 3.9-4.5 GHZ
30 000 ₽
RYZEN 7 3700X
8 CORES, 16 STREAMS 3.6-4.4 GHZ
25 000 ₽
RYZEN 5 3600X
6 CORES, 12 THREADS 3.8-4.4 GHZ
18 500 ₽
RYZEN 5 3600
6 CORES, 12 THREADS 3.6-4.2 GHZ
15 000 ₽
RYZEN 5 3400G *
4 CORES, 8 STREAMS 3.7-4.2 GHZ
11 000 ₽
RYZEN 3 3200G *
4 CORES, 4 STREAMS 3.6-4.0 GHZ
7 200 ₽
AMD Ryzen 5 3400G and Ryzen 3 3200G processors with integrated Radeon Vega graphics use the Zen + architecture (unlike the others built on the new Zen 2 architecture).