SPEC2006 & 2017: Industry Standard - ST Performance

One big talking point around the new Ryzen 3000 series is the new augmented single-threaded performance of the new Zen 2 core. In order to investigate the topic in a more controlled manner with better documented workloads, we’ve fallen back to the industry standard SPEC benchmark suite.

We’ll be investigating the previous generation SPEC CPU2006 test suite giving us some better context to past platforms, as well as introducing the new SPEC CPU2017 suite. We have to note that SPEC2006 has been deprecated in favour of 2017, and we must also mention that the scores posted today are noted as estimates as they’re not officially submitted to the SPEC organisation.

For SPEC2006, we’re still using the same setup as on our mobile suite, meaning all the C/C++ benchmarks, while for SPEC2017 I’ve also went ahead and prepared all the Fortran tests for a near complete suite for desktop systems. I say near complete as due to time constraints we’re running the suite via WSL on Windows. I’ve checked that there are no noticeable performance differences to native Linux (we’re also compiling statically), however one bug on WSL is that it has a fixed stack size so we’ll be missing 521.wrf_r from the SPECfp2017 collection.

In terms of compilers, I’ve opted to use LLVM both for C/C++ and Fortran tests. For Fortran, we’re using the Flang compiler. The rationale of using LLVM over GCC is better cross-platform comparisons to platforms that have only have LLVM support and future articles where we’ll investigate this aspect more. We’re not considering closed-sourced compilers such as MSVC or ICC.

clang version 8.0.0-svn350067-1~exp1+0~20181226174230.701~1.gbp6019f2 (trunk)
clang version 7.0.1 (ssh://git@github.com/flang-compiler/flang-driver.git 
  24bd54da5c41af04838bbe7b68f830840d47fc03)

-Ofast -fomit-frame-pointer
-march=x86-64
-mtune=core-avx2 
-mfma -mavx -mavx2

Our compiler flags are straightforward, with basic –Ofast and relevant ISA switches to allow for AVX2 instructions.

The Ryzen 3900X system was run in the same way as the rest of our article with DDR4-3200CL16, same as with the i9-9900K, whilst the Ryzen 2700X had DDR-2933 with similar CL16 16-16-16-38 timings.

SPECint2006 Speed Estimated Scores

In terms of the int2006 benchmarks, the improvements of the new Zen2 based Ryzen 3900X is quite even across the board when compared to the Zen+ based Ryzen 2700X. We do note however somewhat larger performance increases in 403.gcc and 483.xalancbmk – it’s not immediately clear as to why as the benchmarks don’t have one particular characteristic that would fit Zen2’s design improvements, however I suspect it’s linked to the larger L3 cache.

445.gobmk in particular is a branch-heavy workload, and the 35% increase in performance here would be better explained by Zen2’s new additional TAGE branch predictor which is able to reduce overall branch misses.

It’s also interesting that although Ryzen3900X posted worse memory latency results than the 2700X, it’s still able to outperform the latter in memory sensitive workloads such as 429.mcf, although the increases for 471.omnetpp is amongst the smallest in the suite.

However we still see that AMD has an overall larger disadvantage to Intel in these memory sensitive tests, as the 9900K has large advantages in 429.mcf, and posting a large lead in the very memory bandwidth intensive 462.libquantum, the two tests that put the most pressure on the caches and memory subsystem.

SPECfp2006(C/C++) Speed Estimated Scores

In the fp2006 benchmarks, we gain see some larger jumps on the part of the Ryzen 3900X, particularly in 482.sphinx3. These two tests along with 450.soplex are characterized by higher data cache misses, so Zen2’s 16MB L3 cache should definitely be part of the reason we see such larger jumps.

I found it interesting that we’re not seeing much improvements in 470.lbm even though this is a test that is data store heavy, so I would have expected Zen2’s additional store AGU to greatly benefit this workload. There must be some higher level memory limitations which is bottlenecking the test.

453.povray isn’t data heavy nor branch heavy, as it’s one of the more simple workloads in the suite. Here it’s mostly up to the execution backend throughput and the ability of the front-end to feed it fast enough that are the bottlenecks. So while the Ryzen 3900X provides a big boost over the 2700X, it’s still largely lagging behind the 9900K, a characteristic we’re also seeing in the similar execution bottlenecked 456.hmmer of the integer suite.

SPEC2006 Speed Estimated Total

Overall, the 3900X is 25% faster in the integer and floating point tests of the SPEC2006 suite, which corresponds to an 17% IPC increase, above AMD's officially published figures for IPC increases.

Moving on to the 2017 suite, we have to clarify that we’re using the Rate benchmark variations. The 2017 suite’s speed and rate benchmarks differ from each other in terms of workloads. The speed tests were designed for single-threaded testing and have large memory demands of up to 11GB, while the rate tests were meant for multi-process tests. We’re using the rate variations of the benchmarks because we don’t see any large differentiation between the two variations in terms of their characterisation and thus the performance scaling between the both should be extremely similar. On top of that, the rate benchmarks take up to 5x less time (+1 hour vs +6 hours), and we're able run them on more memory limited platforms (which we plan on to do in the future).

SPECint2017 Rate-1 Estimated Scores

In the int2017 suite, we’re seeing similar performance differences and improvements, although this time around there’s a few workloads that are a bit more limited in terms of their performance boosts on the new Ryzen 3900X.

Unfortunately I’m not quite as familiar with the exact characteristics of these tests as I am with the 2006 suite, so a more detailed analysis should follow in the next few months as we delve deeper into microarchitectural counters.

SPECfp2017 Rate-1 Estimated Scores

In the fp2017 suite, things are also quite even. Interesting enough here in particular AMD is able to leapfrog Intel’s 9900K in a lot more workloads, sometimes winning in terms of absolute performance and sometimes losing.

SPEC2017 Rate-1 Estimated Total

As for the overall performance scores, the new Ryzen 3900X improves by 23% over the 2700X. Although closing the gap greatly and completely, it’s just a hair's width shy of actually beating the 9900K’s absolute single-threaded performance.

SPEC2017 Rate-1 Estimated Performance Per GHz

Normalising the scores for frequency, we see that AMD has achieved something that the company hasn’t been able to claim in over 15 years: It has beat Intel in terms of overall IPC. Overall here, the IPC improvements over Zen+ are 15%, which is a bit lower than the 17% figure for SPEC2006.

We already know about Intel’s new upcoming Sunny Cove microarchitecture which should undoubtedly be able to regain the IPC crown with relative ease, but the question for Intel is if they’ll be able to still maintain the single-thread absolute performance crown and continue to see 5GHz or similar clock speeds with the new core design.

Test Bed and Setup Benchmarking Performance: Web Tests
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  • Targon - Monday, July 8, 2019 - link

    What RAM was used in the Intel system? The Ryzen system used DDR4-3200, but it's CL16, not CL14 RAM. That CAS latency difference would be enough for Ryzen to at least tie the 9900k if not beat it in the gaming tests. Reply
  • Tkan215 - Monday, July 8, 2019 - link

    I dont think so its not easy to refine 10nm like you think how many year it take Intel to refine 10nm it has been already 4 to 5 years dont get your hope up. If volume aint there there is no chance. AMD surelly moving to 7nm euv quicker then 5nm Reply
  • Tkan215 - Monday, July 8, 2019 - link

    I havent seen them drop any price i9900k went back up at amazon.com. Intel continue to ignore, non response and not caring for their competition. they want their margin this is all this company care about not your feeling or desire Reply
  • TEAMSWITCHER - Sunday, July 7, 2019 - link

    It's summer time in Michigan and I have no desire to upgrade right now... I can wait for the flagship 3950X in September. Reply
  • Maxiking - Sunday, July 7, 2019 - link

    Local anandtech yield and node experts got hit again. I wonder how many hits you can take before you shut up.

    As predicted, Intel still faster in games and AMD OC ability more or less unchanged, slighty worse. It is a new node after all buy yeah, you know better, so keep dreaming about those 5ghz on the majority of chips.
    Reply
  • Teckk - Sunday, July 7, 2019 - link

    So more cores at the same TDP as 2000 series Ryzen is nothing? Ok. Reply
  • Maxiking - Sunday, July 7, 2019 - link

    That isn't the thing I was talking about. My point was that local experts, I mean, trolls, know nothing about the manufacturing cost, yields, about the node in general. As it has been showed recently in the reviews, OC ability of the chips is terrible and lower core count parts tend to perform worse, reaching only 4.1 - 4.2 ghz. Reply
  • Teckk - Sunday, July 7, 2019 - link

    Ah, got it. It is an improvement, but not good enough. Reply
  • Maxiking - Sunday, July 7, 2019 - link

    It is good enough in terms of competition and that we can get things cheaper.

    But not when the raw performance is tconsidered. It is a hypothetical scenario, but had there been no 10 nm problems for Intel, AMD would have been in the bulldozer position again.
    Reply
  • catavalon21 - Sunday, July 7, 2019 - link

    I haven't owned an AMD CPU since my K500 a very long time ago, but let's call it what it is - AMD has a CPU at the $500 price point that Intel is charging $1200 presently to compete with, and Intel's solution uses far more power. That's a win for AMD in any domain. Reply

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