Our Hygon Systems

8-core Dhyana and Dual 32-core Dhyana Plus

The full range of Hygon’s known releases boils down to two platforms: one containing a single 8-core Zen 1 die, similar to the desktop range of processors (or EPYC 3000), and a set of server processors built from four dies in a similar arrangement to Naples.

The 8-core engineering sample system we have in to test didn’t provide any exact SKU numbering – on the CPU it says ‘C86’ which is meant to imply ‘Chinese x86’. The rest of the numbering is likely linked to the wafer and batch that this silicon came from, however we do not have decoder rings for those. 

The motherboard uses a microATX form factor, and is very much a server motherboard with the DDR4 slots horizontal rather than vertical in order to direct airflow through the system in a server chassis. Starting primarily with the socket, what we have is a non-socketed BGA design, such that this CPU cannot be upgraded because it is bonded to the motherboard, similar to what we see with laptops and embedded systems. The mounting holes are the thing that surprises me here – these are not the AM4 mounting holes that we typically see with the consumer version of Ryzen, but these mounting holes are Intel mounting holes. Someone must have a lot of old Intel coolers around, I guess? Either that or it makes it easier for Hygon’s partners to find specific server grade coolers.

The CPU has a six-phase power delivery system, and as this is a pure CPU product, there is no integrated graphics. There is a form of 2D graphics provided by the IPMI controller in the bottom left, the classic ASPEED AST2500 chip that we commonly see in server systems. Unlike other microATX motherboards, there isn’t the typical four slot design here, but a three slot design, with two full length PCIe 3.0 slots (capable of x16/x0 or x8/x8) and an open ended PCIe x4 slot.

Normally these CPUs don’t really need a chipset because they have some SoC level IO functionality on the silicon, though consumer Ryzen CPUs were paired with X370 chipsets when the Ryzen 1000 family first launched. Instead of using those chipsets, Hygon has paired the CPU with a Lattice Semiconductor FPGA to act as a chipset of sorts. This gives the motherboard an odd set of combined IO, including SATA ports, four dual LED displays, a number of custom connectors and buttons, and a lot of undocumented things we don’t know. For example, there appears to be two batteries on the motherboard – one presumably to keep the onboard time, but the other seems more permanent and is not obvious why it is there.

Here’s the motherboard where we’ve put an equivalent AM4 consumer Ryzen CPU on top, to show the size.

By comparison, the dual socket server is a bit of a beast. As we understand it, these servers were built for both compute and storage, with each CPU paired with four breakout connectors capable of four U.2 drives or 16-way SATA connectivity. The CPUs have eight channel memory capabilities, but due to a couple of reasons we had to test them in quad channel mode.

The CPUs in this case also say C86, but also have the model number 7185 on them, indicating a 32-core CPU. The carry case is red, whereas Naples EPYC CPUs were blue, Threadripper CPUs are orange, and Rome EPYC CPUs are green. The red might be a nod to the Chinese angle for these CPUs, however no-one we spoke to was able to confirm this.

The server is actually a Sugon design, with 12 front panel 2.5-inch drive slots. For the 8-core system, that was put into a standard desktop case and fitted with a CPU cooler. Both systems were tested though remote desktop access, as Wendell was hosting them in his labs in Kentucky while I’m all the way back in London.

When trying to probe the CPUs, CPU-Z didn’t seem to have much of a clue. The software provided this interface on the 8-core consumer, showing a 3.2 GHz frequency, but only one core, and no other details aside from support for AVX, AVX2, and FMA3. For the server CPUs, CPU-Z failed to run at all. What we were able to determine is that the software thought that every core was a separate socket, and it appears that some of the usual ways to access this data on the AMD consumer CPUs have all been changed here for the Hygon models, either to evade detection using usual methods, or to conform to different standards. One interesting note is that while CPU-Z detected AVX and AVX2, some of our software couldn’t, and we had to revert to SSE detection in order to get that software to even run.

We Tested Hygon Dhyana Processors Hygon CPUs: Chinese Crypto, Different Performance
Comments Locked


View All Comments

  • TheinsanegamerN - Friday, February 28, 2020 - link

    No, the context changes based on speaker, target audience, and tone. The definition of the words does NOT change. Language is not that fluid.

    Claiming language means whatever you want it to mean is a common tactic imposed by those who would use your words against you at every possible opportunity to label you as a deragatory individual. Common vernacular does not change that rapidly.
  • s.yu - Sunday, March 1, 2020 - link

    >Claiming language means whatever you want it to mean is a common tactic imposed by those who would use your words against you at every possible opportunity to label you as a deragatory individual.
    Well said.
    I heard a similar saying before but I think this is better said.
  • peevee - Thursday, February 27, 2020 - link

    "his article makes it pretty clear that they didn't give any Chinese company (or entity) the info they needed to start designing their own high-performance x86 cores in the future."

    It DOES NOT make it clear at all. They provided the license to MODIFY the design as they see fit.
  • Ian Cutress - Thursday, February 27, 2020 - link

    Any requested modifications had to be pre-approved by AMD / AMD's side of HMC.
  • FunBunny2 - Saturday, February 29, 2020 - link

    "That's in contrast to what a TON of other American companies have done when they create a joint venture to get to the Chinese market, where frequently significant amounts of IP find their way to Chinese companies."

    what's loads of funny: if you were sentient at the time, yule remember that Nixon and his capitalist handlers lauded 'opening China' as access to their market by American companies. of course, those with any brains knew that China was really opened to provide billions of cheap labor bodies. hasn't changed yet.
  • back2future - Sunday, March 1, 2020 - link

    Chinese production services provide closer and better customer support and customer oriented product development, know customer needs on lower (and middle) income levels (with knowing their own needs) on world wide comparison.
    Western companies complain about having less demand, but forget their own lack of flexibility and orientation towards customer needs? Give 'em protective duties or all more suitable environmental standards (but that won't be that big problem for future Chinese production also)?
  • khanikun - Monday, March 2, 2020 - link

    China have foundries. SMIC is their biggest one. They're still limited, since all foundries are equipped with the machinery from few companies. Chinese foundries using Chinese machinery are about 15 years behind. They're at like 28 nm or something like that.
  • FreckledTrout - Thursday, February 27, 2020 - link

    AMD was given the green light to do this by the DoD and DoC. Seriously, read the article first comment second.
  • peevee - Thursday, February 27, 2020 - link

    The convoluted scheme with AMD's part ownership of the Chinese companies looks like was specifically invented to prevent regulators from recognizing what was really happening.
  • itsmydamnation - Thursday, February 27, 2020 - link

    thats not even remotely a complex company structure, you want to see an actual complex company structure try the old CVC (F1) strcture. https://joesaward.wordpress.com/2011/05/03/news-co...

Log in

Don't have an account? Sign up now