AMD Threadripper Pro 5995WX and 5975WX Review: Sheer Threaded Dominance

Threadripping with 64 Zen 3 cores.

Threadripper Pro 5995WX 5975WX
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Power Consumption and Efficiency Threadripper Pro 5995WX and 5975WX

There are a few caveats to our power testing: The Lenovo ThinkStation P620 delivers all of its power directly through the motherboard, which prevents us from conducting CPU power measurements from the physical layer that we typically use to validate the results we log from the sensor loop. However, the results do fall within our general expectations. 

The Threadripper 5995WX exhibits the same trend we've seen in the past with AMD's high core count processors — they often draw less power when all cores are fully loaded than when the chip is partially loaded. These power management differences often occur at the behest of power limits and motherboard firmware. The Lenovo system doesn't expose any information we could use to tease out the different approaches.

The Dominus Extreme we used for the W-3175X also presents power measurement challenges. To sidestep the CPU's power limits, Asus offers a secondary power reporting option in the BIOS. Intel's recommended setting (default) reports current by dividing the value by 1.25x, and the readings can sometimes be inaccurate. As such, we've only included measurements we could verify with physical measurements. 

As you can see, the Threadripper Pro chips consume much more power than their desktop PC counterparts, an unavoidable side effect of the high core counts. For example, the 64-core 5995WX peaked at 285W, nearly the same as the 32-core 5975WX. That explains many seemingly-errant benchmark results in the multi-threaded workloads in our test suite — the 5995WX is often power constrained. 

Unlike the 5975WX, due to Lenovo's vendor locking, we can't break the bonds of those limits for the 5995WX. However, we can unlock the 5975WX, enabling up to 400W of power consumption in our stress tests. 

The Threadripper Pro 5000 series chips are generally less power-hungry in real-world workloads than the previous-gen models, translating to improved efficiency metrics in our renders-per-watt-per-day stats. 

Here we take a slightly different look at power consumption by calculating the cumulative amount of energy required to perform x264 and x265 HandBrake workloads and two Blender renders. We plot this 'task energy' value in Kilojoules on the left side of the chart.

These workloads are comprised of a fixed amount of work, so we can plot the task energy against the time required to finish the job (bottom axis), thus generating a handy power chart. Bear in mind that faster compute times and lower task energy requirements are ideal. 

You probably already guessed it, but the Threadripper Pro 5000 series are the most efficient chips in the test pool. 

AMD Threadripper Pro 5995WX and 5975WX Benchmark Test Setup

There are quite a few caveats to our testing. First, we tested the Threadripper 5995WX and 3995WX in the Lenovo ThinkStation P620 workstation, which is unabashedly designed for 100% stability and doesn't support the auto-overclocking Precision Boost Overdrive (PBO) or any other form of overclocking. Additionally, we're constrained to the systems' installed cooler and power limits, not to mention that the 128GB of ECC memory operates at JEDEC memory speeds.

Lenovo uses AMD's vendor-locking Platform Secure Boot (PSB) feature to prevent using the processor with any other motherboard, which you can read about more in-depth here. This technique is used to improve security but is irreversible by the end user, which has terrible implications for the second-hand market. It also impacts our testing — we're stuck with testing the 64-core chips in an unalterable environment. Our results are still plenty valid for our stock configurations, but we can't test overclocking. It wouldn't be surprising if an enthusiast-class motherboard and cooler can extract slightly more performance from the 64-core models, even at stock settings. 

Luckily we didn't face the same restrictions with the Threadripper Pro 5975WX. AMD sent us a sample, so we're free to test with any platform. We chose an MSI WS WRX80 motherboard because it features all of the high-end features you'd expect from an enthusiast-class motherboard, including overclocking (remember, only a few WRX80 motherboards support overclocking). 


(Image credit: MSI)

The MSI WS WRX80 gives you a good idea of some of the features you can expect from a high-end WRX80 motherboard, including eight DIMM slots, seven PCIe 4.0 x16 slots, two M.2 slots, two U.2 connectors, eight SATA ports, and a 10Gbps Aquantia AQC113CS LAN controller. 

We tested the 5975WX at stock and PBO settings, with the latter using Advanced Motherboard settings with a 10X scalar setting. We used the 128GB of ECC memory from the Lenovo system with the MSI motherboard to keep our test pool consistent (we didn't have an eight-DIMM consumer kit for testing). As such, we use eight channels of DDR4-3200 and JEDEC timings for all tested Threadripper Pro configurations. The other platforms in our test pool have varying memory configurations, listed in a chart at the end of the article. 

Intel hasn't sampled us any Xeon W-3300 chips, so our testing feels a bit incomplete. While the W-3300 chips lack the connectivity options and sheer threaded heft of the Threadripper Pro 5000-series models, they are known to have competitive performance in single-threaded work. That pays off in some workloads. 

We're using our Windows 10 test suite for this round of testing, which does necessitate using our older game roster but allows us to compare to our historical results from the previous-gen 64-core 3995WX that we no longer have in the lab.

All of the normal caveats of Threadripper 3000 performance still apply. Windows splits cores into 'processor groups' of 64 threads apiece, so some applications and benchmarks that aren't tuned to span across the groups don't benefit from the increased thread count. For applications that can't span processor groups, some professional users will run multiple program instances in VMs to extract the utmost performance. Even without that type of arrangement, we see a marked uplift in several applications that benefit from 128 threads. Additionally, the software is rapidly evolving to support such large processors. 

AMD's Ryzen Master software, which allows you to tune consumer Threadripper processors, is available with the Threadripper Pro chips, but only if the platform supports overclocking. For instance, the software is locked out on the Lenovo ThinkStation but works perfectly with the MSI WS WRX80. 

Swipe to scroll horizontally
AMD Socket sWRX8AMD Threadripper Pro 5975WX, 3975WX
Row 1 - Cell 0 MSI WS WRX80
Row 2 - Cell 0 8x 16GB SK hynix ECC - DDR4-3200 @ JEDEC Timings
AMD Socket sWRX8 (OEM System)AMD Threadripper Pro 5995WX, 3995WX
Row 4 - Cell 0 Lenovo ThinkStation P620
Row 5 - Cell 0 8x 16GB SK hynix ECC - DDR4-3200 @ JEDEC Timings
Intel Socket 3647Intel Xeon W-3175X
Row 7 - Cell 0 ASUS ROG Dominus Extreme
Row 8 - Cell 0 6x 8GB Corsair Vengeance RGB DDR4-2466
Intel Socket 1700 DDR4 (Z690)Core i9-19200K
Row 10 - Cell 0 MSI Z690A WiFi DDR4
Row 11 - Cell 0 2x 8GB Trident Z Royal DDR4-3600 - Stock: DDR4-3200 14-14-14-36
AMD Socket AM4 (X570)AMD Ryzen 9 5950X, 5900X

MSI MEG X570 Godlike
Row 14 - Cell 0 2x 8GB Trident Z Royal DDR4-3600 - Stock: DDR4-3200
Intel Socket 2066 (X299)Core i9-10980XE
Row 16 - Cell 0 MSI Creator X299
Row 17 - Cell 0 4x 8GB Trident Z Royal DDR4-3600 - Stock: DDR4-2933
AMD Socket SP3 (TR4)Threadripper 3960X, 3970X, 3990X
Row 19 - Cell 0 ASUS ROG Zenith II Extreme
Row 20 - Cell 0 4x 8GB Trident Z Royal DDR4-3600 - Stock: DDR4-3200
All SystemsGigabyte GeForce RTX 3090 Eagle - Gaming and ProViz applications
Row 22 - Cell 0 Nvidia GeForce RTX 2080 Ti FE - Application tests

2TB Intel DC4510 SSD

EVGA Supernova 1600 T2, 1600W
Row 25 - Cell 0 Open Benchtable

Windows 10 Pro version 2004 (build 19041.450)
Row 27 - Cell 0 Workstation Tests - 4x 16GB Corsair Dominator - Corsair Force MP600
CoolingCorsair H115i, OEM Cooling, Enermax Liqtech TR4 II 360
Paul Alcorn
Deputy Managing Editor

Paul Alcorn is the Deputy Managing Editor for Tom's Hardware US. He writes news and reviews on CPUs, storage and enterprise hardware.

  • -Fran-
    I love the latching mechanism of sWRX8. They should consider using it in consumer as well. I mean, they're already going to ask for a pretty penny on the current one, so why not just make the mechanism the best in the industry?

    And this looks quite impressive, specially since these can also do games quite well it seems. I wonder if AMD will ever put a "mini-Milan-X" in sWRX8 for whomever can pay for it? XD

  • escksu
    I am hoping tomshardware could test on win11 or server 2022. This is because these 2 OS by default will allow apps to use all available threads
  • Wisecracker
    Snagged an OEM ThinkStation P620 Workstation 16 or so months ago from RTP for $2,400 with ...AMD Ryzen TR Pro 3945WX
    32GB DDR4-3200 RDIMM ECC
    Quadro P2200 5GB - 4x DP_1.4
    Marvell 10Gb Ethernet
    512 GB M.2 Gen 3 PCIe SSDBuilt software RAID with 1TB Samsung SSDs, updated softwares (primarily Vegas Pro) with Canon SLR stuff and fancy appurtenances. Will do a minute -- in 30 seconds.

    Other than a !%$@!*^ noisy PSU fan, it has been bulletproof ___ BUT, our good friends at AMD are taking advantage of their captured market. OEM prices easily are up 50% ...
  • Sylwah
    Not a great article: this is a workstation processor and you're leading with gaming benchmarks, and continue to mostly cover gaming.

    Then there's the Windows 10/11 discussion.

    Please do better next time.
  • Guy Rouillier
    "The problem is AMD has left the two lower-end 12- and 16-core Pro models as OEM-only, so they won't come to retail."

    NewEgg has the Threadripper PRO 5955WX available now for $1299:
    That's a pretty hefty entry price for a home system, but it is available. The quad channel memory of the 3000 series was also better matched to the enthusiast market; only servers and high-end workstations benefit from the 8-channel memory. But I understand AMD's position; they are supply-constrained, so might as well go for the highest-priced markets available.
  • This is not an option for home DIY builders, unless they have more money than sense

    This is a workstation class processor and this is what we use at work on our workstations with tons of RAM and lots of storage so we can run as many virtual machines at once as we need for software development and testing

    Threadrippers are all we use. we don’t bother with intel because they have NOTHING to touch it
  • Guy Rouillier
    Mandark said:
    This is not an option for home DIY builders, unless they have more money than sense

    I wouldn't necessarily disagree with that, given the cost of a complete system on this platform. I was also a professional software developer, now retired. The last system I built for myself around 2013, which I'm still using, is a dual AMD Opteron 4234 with 16 GB of memory and all SSD storage. If I were to build a new system today, it would be with Threadripper. Though as I mentioned, for software development 8 memory channels is overkill; 4 really was the sweet spot. I ran our complete runtime environment on my system: a DBMS (Oracle or PostgreSQL), a web server with a JavaEE stack, a JBoss app server, plus all my development tools (Eclipse, etc.)

    So, there is still a need for powerful workstation-class systems for individual end-users, but the numbers are small compared to the overall size of the market.