The AMD Threadripper 2990WX 32-Core and 2950X 16-Core Reviewby Dr. Ian Cutress on August 13, 2018 9:00 AM EST
If you live by the workstation, you die by the performance. When it comes to processing data, throughput is key: the more a user can do, the more projects are accomplished, and the more contracts can be completed. This means that workstation users are often compute bound, and like to throw resources at the problem, be it cores, memory, storage, or graphics acceleration. AMD’s latest foray into the mix is its second generation Threadripper product, also known as Threadripper 2, which breaks the old limit on cores and pricing: the 2990WX gives 32 cores and 64 threads for only $1799. There is also the 2950X, with 16 cores and 32 threads, for a new low of $899. We tested them both.
The AMD Threadripper 2990WX 32-Core and 2950X 16-Core Review
Ever since AMD launched its first generation Ryzen product, with eight cores up against Intel’s four cores in the mainstream, the discussion has been all about how many cores makes sense. The answer to this question is entirely workload dependent – how many users have a single workload in mind, or how many will use a variety of tools simultaneously. The workstation market encompasses a wide range of distinct power users, and despite the need for speed, there is rarely a one-size fits all solution.
AMD’s first generation of Threadripper, launched in 2017, introduced 16-core processors to the masses. Previously only available on the server platforms, these new parts were priced very competitively against 10-core offerings. AMD had ultimately used its server platform, with a few tweaks, to attack a competitive landscape where Halo products are seen as king-of-the-hill.
Intel’s own workstation products, previously named E5-2687W and relied on dual socket servers, were literally that – servers. After launching its latest high-end desktop platform, with up to 18 cores, Intel then subsequently launched the Xeon W-series, which replaced the E5-W parts from the previous generation. Again, these were up to 18-cores for ~$2500, but required special chipsets and motherboards.
Today AMD is officially putting out for sale its second generation of Threadripper. These new parts attack the market two-fold: firstly by using the improved Zen+ microarchitecture, giving for a 3% IPC increase in core performance, but also using 12nm, driving up frequencies and reducing power. The second attack on the market is core count: while AMD will be replacing the 12 and 16 core processors with new Zen+ models at higher frequencies, AMD also has 24 and 32 core processors for up to $1799. When comparing 32 cores at $1799 against 18 cores at $2500, it seems like a slam dunk, right?
How AMD Enabled 32 Cores
The first generation server processor line from AMD, called EPYC, uses four silicon dies of eight cores each to hit a the full 32 core product. These parts also had eight memory channels and 128 lanes of PCIe 3.0 to play with. In order to make the first generation Threadripper processors, AMD disabled two of those silicon dies, giving only 16 cores, four memory channels, and 60 lanes of PCIe. The end product was sold focused at consumers, not server customers.
For 32 cores, AMD takes the same 32-core EPYC silicon, but upgrades it to Zen+ on 12nm for a higher frequency and lower power. However, to make it socket compatible with the first generation, it is slightly neutered: we have to go back to four memory channels and 60 lanes of PCIe. AMD wants users to think of this as an upgraded first generation product, with more cores, rather than a cut enterprise part. The easy explanation is to do with product segmentation, a tactic both companies have used over time to offer a range of products.
As a result, one way of visioning the new second generation 32-core and 24-core products is bi-modal: half the chip has access to the full resources, similar to the first generation product, while the other half of the chip doubles the same compute resources but has additional memory and PCIe latency compared to the first half. For any user that is entirely compute bound, and not memory or PCIe bound, then AMD has the product for you.
In our review, we’ll see that this bi-modal performance difference can have a significant effect, both good and bad, and is very workload dependent.
AMD’s New Product Stack
The official announcement last week showed that AMD is coming to market with four second generation Threadripper processors. Two of these will directly replace the first generation product: the 16-core 2950X will replace the 16-core 1950X, and the 12-core 2920X will replace the 12-core 1920X. These two new processors will not be bi-modal as explained above, with only two of the four silicon die on the package being active (the 16-core will be a 8+0+8+0 configuration, the 12-core is a 6+0+6+0). Sitting at the bottom of the stack will be the first generation 8-core (4+0+4+0) 1900X that also offers quad-channel memory and 60 PCIe lanes.
|TR 1950X||$999||$899||TR 2950X|
|TR 1920X||$799||$649||TR 2920X|
The two new processors are the 32-core 2990WX and the 24-core 2970WX. They will enable four cores per complex (8+8+8+8) and three cores per complex (6+6+6+6) respectively, and are under the bi-modal nature of the memory and PCIe. The naming changes up to WX, presumably for ‘Workstation eXtreme’, but this puts the product in the same marketing line as the Radeon Pro WX family.
|TR 2990WX||32/64||3.0/4.2||64 MB||4x2933||60||250 W||$1799|
|TR 2970WX||24/48||3.0/4.2||64 MB||4x2933||60||250 W||$1299|
|TR 2950X||16/32||3.5/4.4||32 MB||4x2933||60||180 W||$899|
|TR 2920X||12/24||3.5/4.3||32 MB||4x2933||60||180 W||$649|
|Ryzen 7 2700X||8/16||3.7/4.3||16 MB||2x2933||16||105 W||$329|
The AMD Ryzen Threadripper 2990WX is the new halo product, with 32 cores and 64 threads coming in with a base frequency of 3.0 GHz and a top turbo frequency of 4.2 GHz. The idle frequency of this processor is 2.0 GHz, and when installed we saw 2.0 GHz on any core without work – it almost becomes the dominating frequency if the CPU isn’t constantly loaded. The 2990WX will be available from today and retail for $1799.
The other member of the WX series is the 2970WX, which disables one core per complex for a total of 24 cores. With similar frequencies as the 2990WX, and the same TDP, PCIe lanes, and memory support, this processor will be launched in October at the $1299 price point. With fewer cores being loaded, one might expect this processor to turbo more often than the bigger 32-core part.
For the X-series, the TR 2950X is our 16-core replacement, taking full advantage of the better frequencies that the new 12nm process can give: a base frequency of 3.5 GHz and a turbo of 4.4 GHz puts the previous generation processor to shame. In fact, the 2950X is set to be the joint highest clocked AMD Ryzen product. With that bump also comes a price drop: instead of $999 users can now get a 16-core processor for $899. The 2950X is due out at the end of the month, on August 31st.
Bringing up the rear is the 2920X, sitting in to replace the 1920X and with a similar trade-off to the other parts. As with the 2950X, the frequencies are nice and high compared to last year, with a base frequency of 3.5 GHz and a turbo of 4.3 GHz. This is all in a thermal design package of 180W. AMD told us that the TDP ratings for Threadripper 2, in general, were fairly conservative, so it will be interesting to see how they hold up. The 2920X is also out in October, going for $649 retail.
In This Review
- AMD’s New Product Stack [this page]
- Core to Core to Core: Design Trade Offs
- Precision Boost 2, Precision Boost Overdrive
- Feed Me: Infinity Fabric Requires 6x Power
- Test Setup and Comparison Points
- Our New Testing Suite for 2018 and 2019
- HEDT Benchmarks: System Tests
- HEDT Benchmarks: Rendering Tests
- HEDT Benchmarks: Office Tests
- HEDT Benchmarks: Encoding Tests
- HEDT Benchmarks: Web and Legacy Tests
- Overclocking: 4.0 GHz for 500W
- Thermal Comparisons: Remember to Remove the CPU Cooler Plastic!
- Going Up Against EPYC: Frequency vs Memory Channels
- Conclusions: Not All Cores Are Made Equal
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just4U - Monday, August 13, 2018 - linkIan, were you testing this with the CM Wraith Cooler? If not is it something you plan to review?
Ian Cutress - Monday, August 13, 2018 - linkMost of the testing data is with the Liqtech 240 liquid cooler, rated at 500W. I do have data taken with the Wraith Ripper, and I'll be putting some of that data out when this is wrapped up.
IGTrading - Monday, August 13, 2018 - linkTo be honest, with the top of the line 32core model, it is interesting to identify as many positive effect cases as possible, to see if that entire set of applications that truly benefit of the added cores will persuade power users to purchase it.
Like you've said, it is a niche of a niche and seeing it be X% faster of Y% slower is not as interesting as seeing what it can actually do when it is used efficiently and if this this makes a compelling argument for power users.
PixyMisa - Tuesday, August 14, 2018 - linkPhoronix found that a few tests ran much faster on Linux - for 7zip compression in particular, 140% faster (as in, 2.4x). Some of these benchmarks could improve a lot with some tweaking to the Windows scheduler.
phoenix_rizzen - Wednesday, August 15, 2018 - linkIt'd be interesting to redo these tests on a monthly basis after Windows/BIOS updates are done, to see how performance changes over time as the Windows side of things is tweaked to support the new NUMA setup for TR2.
At the very least, a follow-up benchmark run in 6 months would be nice.
Kevin G - Monday, August 13, 2018 - linkChiplets!
The power consumption figures are interesting but TR does have to manage one thing that the high end desktop chips from Intel don't: off-die traffic. The amount of power to move data off die is significantly higher than moving it around on-die. Even in that context, TR's energy consumption for just the fabric seems high. When only threads are loaded, they should only be with dies with the memory controllers leaving two dies idle. It doesn't appear that the fabric is powering down while those remote dies are also powering down. Any means of watching cores enter/exit sleep states in real time?
I'd also be fun to see with Windows Server what happens when all the cores on a die are unplugged from the system. Consdiering the AMD puts the home agent on the memory controller on each die, even without cores or memory attached, chances are that the home agent is still alive consuming power. It'd be interesting to see what happens on Sky Lake-SP as well if the home agents on the grid eventually power themselves down when there is nothing directly connected to them. It'd be worth comparing to the power consumption when a core is disabled in BIOS/EFI.
I also feel that this would be a good introduction for what is coming down the road with server chips and may reach the high end consumer products: chiplets. This would permit the removal of the off-die Infinity Links for something that is effectively on-die throughout the cluster of dies. That alone will save AMD several watts. The other thing about chiplets is that it would greatly simplify Thread Ripper: only two memory controller chiplets would be to be in the package vs. four as we have now. That should save AMD lots of power. (And for those reading this comment, yes, Intel has chiplet plans as well.). The other thing AMD could do is address how their cache coherency protocols work. AMD has hinted at some caching changes for Zen 2 but lacks specificity.
gagegfg - Monday, August 13, 2018 - linkdo not seem to exist more than once the 16 additional core of the 2990wx compared to the 2950x
Ian Cutress - Monday, August 13, 2018 - linkhttps://www.anandtech.com/bench/product/2133?vs=21...
Chaitanya - Monday, August 13, 2018 - linkBuilt for scientific workload.
woozle341 - Monday, August 13, 2018 - linkDo you think the lack of AVX512 is an issue? I might build a workstation soon for data processing with R and Python for some Fortran models and post-processing. Skylake-X looks pretty good wit its quad memory channels despite its high price.