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Discussion Starter · #1 · (Edited)



AMD Zen 2 in every segment

After releasing Zen 2 for mainstream desktop as Ryzen 3000 and for server as EPYC 7002, AMD is following up with a 7 nm update to the Threadripper platform. While desktop users are mostly concerned with performance over power, improvements to energy efficiency usually allows for higher overall performance. The release of second generation Threadripper processors in 2018 increased the peak core count from 16 to 32 resulting in escalated power consumption. This article takes a look at how Zen 2’s improved energy efficiency translates to raw performance for high-end desktops.


Platform changes




  • Unified memory architecture using a 12 nm I/O-die coupled with up to eight 7 nm Zen 2 chiplets
  • Increased fabric bandwidth and doubled L3 cache
  • Support for higher memory speeds and asynchronous memory/fabric clock domains
  • 3960X (24 core) and 3970X (32 cores) at launch, with up to 64 cores coming later
  • CPU PCI-E links upgraded to Gen 4
  • CPU PCI-E lanes from 60 (2×16, 2×8, 3×4) to 56 (2×16, 2×8, 2×4)
  • New TRX40 chipset (same as X570)
  • CPU-chipset link upgraded from x4 Gen 3 to x8 Gen 4 (bandwidth from 3.94 GB/s to 15.75 GB/s)
  • Four USB 3.2 Gen 2 (previously eight USB 3.1 Gen 1)

While the new AM4 and SP3 processors drop into existing boards with a firmware update (sacrificing PCI-E 4.0 capability), backwards compatibility is broken between TR4 and the new TRX4 socket. The physical socket is the same LGA4094 model used for both EPYC and previous Threadripper parts. The CPU-chipset link is increased from four to eight lanes through a re-purposed PCI-E x4 port, which connects to the TRX40 chipset.


Test Setup


  • AMD Threadripper “3970X” ES (32 cores, 4.4 GHz Boost, 280W TDP) / 2990WX (32 cores, 4.2 GHz Boost, 250W TDP)
  • ASUS ROG Zenith II Extreme (BIOS 0042) / Zenith Extreme (BIOS 2001)
  • G.SKILL F4-4000C18Q-32GTZKW (4x8GB)
  • Custom water cooling (Rajintek CWB-TR4 RBW + Bykski B-RD360-TK60)
  • Windows 10 1903, AMD Chipset Driver 1.9.27.1033, Ryzen High Performance power plan

The Threadripper 3000 processor used in this test is an engineering sample with slightly different specifications compared to a retail 3970X. Notably the boost and base clocks are 100 MHz lower, which means stock performance is lower than a final part.


Method

Any benchmark results are the average of three runs. In the single threaded tests, the thread affinity for the benchmark was manually set to the highest ranked core. HWInfo 6.14 was used to record the monitoring information during the run. The average frequency was measured using the “Effective Clock” item. The average power was measured directly from the VRM controller and reports the CPU Core power or SOC power only. Load-Line Calibration was set to Level 5 for the overclocked results.


Results and Analysis

Memory Performance



The new memory architecture coupled with increased fabric speed shows major improvements in memory bandwidth at the same settings. At 3200 MT/s the read bandwidth is 13.4 GB/s higher. Since all cores now have to access memory through the I/O-die, there is a best case latency penalty. At these settings, latency is increased from 66.4 ns to 84.2 ns.



As with regular desktop Ryzen 3000 processors, higher memory speeds are possible with fabric and memory independently clocked. In this case, the system was capable of 4400 MT/s while locking fabric speed to 1800 MHz.

Stock Performance



Comparing the multi-threaded stock performance reveals just how much more efficient Zen 2 is compared to the last generation. At the same power consumption the new processor is 39% faster while maintaining 14% higher clock speeds and reports 14 °C lower temperatures. This is in one benchmark, but arguably other applications may benefit more due to the simplified memory architecture being less dependent on software optimization.



Moving over to the single-threaded test shows a performance increase of 22% at 7% higher frequency. The reported temperatures are similar across the single- and multi-threaded tests. Probably the reported temperature is considering peaks from several sensors and a single core is allowed to use more power when others are idle.

Overclocked Performance



Both processors were overclocked to a point where they could consistently pass the benchmark, which resulted in 4.2 GHz on the 2990WX and 4.4 GHz on the 3970X. In this all-out configuration, the 3970X ES is 31% faster while consuming 30% less power. The reported temperature is also significantly lower.



In heavier tests, the frequencies had to be dropped. The 2990WX could pass for at least 10 minutes in Prime 95 at 3.9 GHz. The 3970X ES passed at 4.3 GHz without AVX and 4.2 GHz when enabled. When allowing AVX instructions the 2990WX power consumption drops, because it takes two clock cycles to executes 256-bit AVX instructions. The 3970X ES can execute them in a single cycle, resulting in higher power consumption even with reduced frequency and voltage.

SOC Power Consumption



At default SOC voltage for 3200 MT/s memory speed (1.05 V in both cases) there are substantial power reductions from the chiplet design. Idle power consumption drops by 56% and in MemTest64 it’s 49% lower.

Original article: https://www.elmorlabs.com/index.php/2019-11-25/amd-threadripper-3000-30-faster-at-30-lower-power/


Feel free to ask if you have questions or want to see any specific test.
 

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Wow, thanks for all the time put in on this.

I really appreciate the memory bandwidth and latency tests. As well as the SOC notes.
 

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thank you for article. It is yours sample? Will be gonna back with some LN2 results?

I was thinking to buy this monster, but my flat is higher priority :( Maybe next generation and depends on my situation in late next year. But I am impressed how awesome eprformance and effectivity those CPUs have. Comeback of AMD with old glory! BTw, so current TRX40 boards can handle also new ROMEs CPUs?
 

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Looking mighty good!

Thank you for the in depth look at these new chips. You may not hear it often but I and others in the community do appreciate what you are doing for us.

I am debating picking up a 3960X in the near future with a TRX40 mobo & 32gb DDR4, then waiting until DDR5 & 4000 series is released to buy up more cheap ram & a cheap 3990X. Would make for a fairly affordable & high powered home server after I upgrade down the line and my old hardware is relegated to the server closet for Plex & home surveillance. Certainly much cheaper than a comparable Dell R740 would cost. I bet it'd have lower power bills too..
 

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Good test results lord moffle :thumb:
 

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Discussion Starter · #7 ·
Wow, thanks for all the time put in on this.

I really appreciate the memory bandwidth and latency tests. As well as the SOC notes.
Looking mighty good!

Thank you for the in depth look at these new chips. You may not hear it often but I and others in the community do appreciate what you are doing for us.

I am debating picking up a 3960X in the near future with a TRX40 mobo & 32gb DDR4, then waiting until DDR5 & 4000 series is released to buy up more cheap ram & a cheap 3990X. Would make for a fairly affordable & high powered home server after I upgrade down the line and my old hardware is relegated to the server closet for Plex & home surveillance. Certainly much cheaper than a comparable Dell R740 would cost. I bet it'd have lower power bills too..

Thanks, I enjoy doing these tests too. Takes a bit too much time away from other things I should be doing instead though. The numbers here should mostly interest those looking to go from TR4 to TRX4. Will certainly be interesting to see 64C on a "consumer" platform in the future.

thank you for article. It is yours sample? Will be gonna back with some LN2 results?

I was thinking to buy this monster, but my flat is higher priority :( Maybe next generation and depends on my situation in late next year. But I am impressed how awesome eprformance and effectivity those CPUs have. Comeback of AMD with old glory! BTw, so current TRX40 boards can handle also new ROMEs CPUs?
I don't plan on doing LN2 results this time around, there are others doing a great job on Hwbot already.
 

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Thanks, I enjoy doing these tests too. Takes a bit too much time away from other things I should be doing instead though. The numbers here should mostly interest those looking to go from TR4 to TRX4. Will certainly be interesting to see 64C on a "consumer" platform in the future.



I don't plan on doing LN2 results this time around, there are others doing a great job on Hwbot already.
My friend, I know you want to LN2 it is in your blood, so get on to it and show us some results.
 

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That ares true man words :D
 

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OMG 3990X under LN2.... We gonna need new Benchmarks to stress it :).
I see same Max Clock on 3950X/3970X in CB with LN2 WR's, so looks like that even the 3990X could do over 5Ghz... OMG the scores gonna be Epyc!
 

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Any AMD Ryzen Threadripper 3xxx owner here? Maybe someone can answer me my question :) Is it possible to dissable cores in the bios and only enable them if you need them for your workloads? The idle watt usage is very high in my opinion.
 

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Ryzen 3960, 32GB TaiChi MB, Meshify S2 case Liquitech 360 AIO lots of fans
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Having found a 3960X locally, I am putting together a system. AMD3960X, Liquitech TR4 II 360 AIO cooler(covers full surface area of Die), Aorus 1TB NVMe Gen4 SSD, Ballistix 4X8GB DDR4000 memory on an Asrock Taichi motherboard. Concerned about memory timing. Does it make sense to reduce memory clock to 3600(the 4000 chips were only fast ones in stock in a 4X8GB kit)? Waiting for Fractal Design Meshify Case from Newegg which was sent by slow truck across country even though I paid for 2nd day delivery so I haven't been able to start assembly yet.
 

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Ryzen 3960, 32GB TaiChi MB, Meshify S2 case Liquitech 360 AIO lots of fans
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I have not played around with it much yet but I believe Ryzen Master will allow you to disable cores (Available from AMD overclocking utility) This can be useful if a game or other app can not use all cores. You can disable cores to spread heat dissipation more widely and overclock a little faster on remaining cores. This is also an advantage of the 3960 vs the 3970: fewer cores means power budget per core goes up(higher clock possible and turbo modr sustained longer).
 

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Discussion Starter · #17 ·
Any AMD Ryzen Threadripper 3xxx owner here? Maybe someone can answer me my question :) Is it possible to dissable cores in the bios and only enable them if you need them for your workloads? The idle watt usage is very high in my opinion.

How high is your idle power consumption and where do you measure? You can disable cores in BIOS, but not on-the-fly in the OS.
 

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Should not need to disable cores. Cores sleep when not in use cutting power consumption dramatically. Takes a lot to wake them all up. Have not tracked true power used, but judging from fan speed, it is very difficult to find enough work to make this draw anywhere near half its TDP. If you look at RyzenMaster, most of the time, the vast majority of cores are sleeping or crawling along well below 1Ghz. The only reason to disable cores in the BIOS is for fossil software than can not behave in the presence of high core count processors. Just as a hot rod car is not meant to always be drive at 150mph, Threadripper behaves reasonably well under lower loads. If you do not want the reserve power available here, you should buy a much cheaper lower core count processor. As I am writing this, with a videogame paused in the background, all but one core are either asleep or running at under 20MHz(not a misprint!) and total Threadripper power draw is 80W per RyzenMaster--also in background.
 

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Good work, very useful into here!
 

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Discussion Starter · #20 ·
About a week late to the party, but here's an update with the 64-core 3990X.

In order to read the output power estimation directly from the VRM controller, an EVC2 was connected directly to the SMBus on the motherboard. It turns out that the ASP1405I controller can only read values up to 511.5 and any value above is clipped. Since the output current stayed below this value, the higher output power this could still be calculated using Pout = Vout*Iout.




Stock Performance



At default settings, what stands out is the 54% higher Cinebench R20 score at maintained power consumption and temperature. The CPU frequency is only decreased to 3149 MHz compared to 3648 MHz on the 32-core version. This highlights the benefit of linear power scaling through additional cores/transistors, compared to exponential scaling from frequency and increased voltages.


Overclocked Performance



When it comes to overclocking, there are a few trade-offs. When the frequency is maxed out, performance is 68% higher, but at 65% higher power consumption. The temperature remains comparable due to the large heat-spreader and chiplet-design. There’s a slight drop in achievable frequency, but keep in mind it’s a comparison of single processor samples.



In Prime 95 the highest achievable frequencies were about 300 MHz lower than the 32-core version, and power consumption was 28-35% higher. In this case we’re probably close to the package & heat-sink limit due to the longer running time.


SOC Power Consumption



Going from four chiplets to eight does increase power consumption somewhat. Since the number of memory channels and PCI-E lanes remain the same, the increase is most likely due to the additional Infinity Fabric links.


Original article: https://www.elmorlabs.com/index.php/2020-02-14/amd-threadripper-3990x-64-core-processor/
 
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