AMD’s New EPYC 7F52 Reviewed: The F is for ᴴᴵᴳᴴ Frequencyby Dr. Ian Cutress on April 14, 2020 9:45 AM EST
- Posted in
- Enterprise CPUs
- CPU Frequency
Everyone wants a fast processor. The ability to get more stuff done is one of a number of guiding principles of business. However, business also needs consistency, safety and security, which is why having enterprise-class processors is often a requirement in the back-end infrastructure. These processors, with lots of cores, aren’t as fast as consumer processors, so it becomes a tussle whether it makes sense to go fast without security, or to play it safe with a proven platform. With AMD’s new 7F processors, the aim is to provide that proven platform with super-fast cores with lots of cache. We’ve got the 7F52 in for testing today.
The Enterprise Market Wants It All
The nature of enterprise processors in recent generations has tended towards more cores and more cache. As power budgets have increased, in order to ensure stability and get the best efficiency points, the solution has been to add more cores. However, there are still markets that want high frequency components, and quite often users will look at consumer hardware, which doesn’t offer the trimmings of the enterprise world, such as ECC memory, RAS features, management, and high-speed IO. We’ve seen OEMs build servers on super rare ‘consumer-grade’ processors, like the auction-only 5 GHz 14-core parts that offer the peak of performance, but fall down on basic enterprise features, such as ECC memory.
To that end, AMD’s Enterprise division has been developing some high-frequency processors within its EPYC line of hardware to address this market. We saw with the first generation ‘Naples’ EPYC processors AMD come out with a special EPYC 7371 processor, which offered 16 cores but had +700 MHz on the base frequency and +900 MHz on the turbo frequency compared to the next best 16-core part, and the tradeoff was only +30 W of power and paying a bit extra. At the time the EPYC 7371, which was launched several months after the rest of the product line, was a test run for what is this new line of 7F ‘high frequency’ processors.
AMD 7F and 7H: Targeting High Performance
The best way to consider AMD’s EPYC processor line, especially for the second generation ‘Rome’ hardware, is in four segments.
First is the main stack. These are the regular processors for the majority of the market, from the 7252 with eight cores all the way up to the 7742 with 64 cores. These are all dual-socket compatible, and are anywhere from 155 W to 225 W (except the 7252 and 7262 which are 120 W).
|AMD EPYC 7002 'Rome' Processors (2P)|
|EPYC 7742||64 / 128||2.25||3.40||256 MB||225 W||$6950|
|EPYC 7702||64 / 128||2.00||3.35||256 MB||200 W||$6450|
|EPYC 7642||48 / 96||2.30||3.20||256 MB||225 W||$4775|
|EPYC 7552||48 / 96||2.20||3.30||192 MB||200 W||$4025|
|EPYC 7542||32 / 64||2.90||3.40||128 MB||225 W||$3400|
|EPYC 7502||32 / 64||2.50||3.35||128 MB||200 W||$2600|
|EPYC 7452||32 / 64||2.35||3.35||128 MB||155 W||$2025|
|EPYC 7402||24 / 48||2.80||3.35||128 MB||155 W||$1783|
|EPYC 7352||24 / 48||2.30||3.20||128 MB||180 W||$1350|
|EPYC 7302||16 / 32||3.00||3.30||128 MB||155 W||$978|
|EPYC 7282||16 / 32||2.80||3.20||64 MB||120 W||$650|
|EPYC 7272||12 / 24||2.90||3.20||64 MB||155 W||$625|
|EPYC 7262||8 / 16||3.20||3.40||128 MB||120 W||$575|
|EPYC 7252||8 / 16||3.10||3.20||64 MB||120 W||$475|
Second are the single socket processors. These are variants of the main stack but designated with a P at the end, as these are built for systems that only require a single processor. The benefit here is that the P processors are actually cheaper ($2600 for the 32-core 7502 compared to $2300 for the 7502P) if the customer can guarantee they never need a dual socket design. These also go from 8 cores all the way up to 64 cores.
|AMD EPYC 7002 Rome Processors (1P)|
|EPYC 7702P||64 / 128||2.00||3.35||256 MB||200 W||$4425|
|EPYC 7502P||32 / 64||2.50||3.35||128 MB||200 W||$2300|
|EPYC 7402P||24 / 48||2.80||3.35||128 MB||200 W||$1250|
|EPYC 7302P||16 / 32||3.00||3.30||128 MB||155 W*||$825|
|EPYC 7232P||8 / 16||3.10||3.20||32 MB||120 W||$450|
|*170W TDP mode also available|
Third is the 7H family of processors, which as it stands only has one member right now. This was launched a couple of months after the first two segments, and the ‘H’ stands for High Performance Computing. The power limits of this chip has increased up to 280 W, and the goal is to drive a higher sustained frequency than the regular parts. For example, the 7742 has a base frequency of 2.25 GHz at 225W, but the 7H12 has a base frequency of 2.60 GHz at 280 W. The 7H processors aren’t on general retail as far as we can tell, but specific customers can request them.
|AMD EPYC 7H Rome Processors (1P)|
|EPYC 7H12||64 / 128||2.60||3.30||256 MB||280||$?|
Fourth is the newest set of hardware, the 7F family. The F in this case is for Frequency, and these parts are spiritual successors to the 7371 in the last generation: a lot more base frequency and a lot higher turbo for the consumer to use. AMD is also equipping these processors with lots of cache, so the cache per core can effectively quadruple.
There are three members to the Rome 7F family:
|AMD EPYC 7F Rome Processors (1P)|
|EPYC 7F72||24 / 48||3.20||3.70||192 MB||240 W||6||2||$2450|
|EPYC 7F52||16 / 32||3.50||3.90||256 MB||240 W||8||1||$3100|
|EPYC 7F32||8 / 16||3.70||3.90||128 MB||180 W||4||1||$2100|
These processors do look a little confusing.
For the 8 core 7F32 and the 16 core 7F52, AMD is enabling 1 core per CCX, or 2 cores per chiplet, which means the equivalent of 16 MB of L3 cache per core. This is four times as much as what any other AMD EPYC processor gets.
The 24 core 7F72 is cheaper than the 16 core, as AMD is adjusting the level of cache on offer here to 192 MB. This means that this processor only has six of the eight chiplets active, and each CCX will have two cores active (6 chiplets * 2 CCX per chiplet * 2 cores per CCX = 24). The frequency is a little bit lower because of the increased active core density, so along with the decreased cache, AMD felt the need to price this one below that of the 7F52.
For this review, we’re testing the 7F52 processors. Compared to the base 7302 16-core that AMD offers, this means another +500 MHz on the base frequency, and +600 MHz on the turbo frequency, but also going up from 155 W to 225 W.
Naturally some of the key comparison points for the 7F52 CPU are going to be equivalent 16-core CPUs from Intel, such as the new Xeon Gold 6226R, or comparisons to 28/32 core options from both Intel and AMD.
|7F52 2P Comparison Points|
|2 x 16 / 32||32 / 64||Cores / Threads||28 / 56||2 x 16 / 32|
|2 x 256 MB||64 MB||L3 Cache||38.5 MB||2 x 22 MB|
|2 TB / socket||2 TB||DRAM Capacity||1 TB||1 TB / socket|
|2 x 240 W||180 W||TDP||205 W||2 x 150 W|
|2 x $3100||$4200||Price||$10008||2 x $1300|
In our tests today, we’re using Supermicro’s H11DSi motherboard for testing the 2P EPYC processors, the ASRock Rack EPYCD8 for the 1P configurations, the ASUS WS C621E SAGE for 2P Xeon, and the ASUS ROG Dominus Extreme for 1P Xeon. Many thanks to Kingston for supplying memory for this review, as well as Micron for both memory and storage, Corsair for the power supplies, and Noctua for the coolers.
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eastcoast_pete - Tuesday, April 14, 2020 - linkThanks Ian! Two questions: 1. Could you and some of your readers give specific examples of applications for which these high frequency CPUs are of great interest?
2. Any recent moves by Intel to make software developers use AVX512 even more, basically whenever it would make any sense?
The reason I am asking the second question is that this seems to be the last bastion Intel holds, almost regardless of CPU class. Except for AVX512, AMD is beating them in price/performance quite badly, now from servers to workstations to desktop to mobile.
schujj07 - Tuesday, April 14, 2020 - linkDB servers are one place where you want a fast CPU. SAP HANA for example loves frequency and RAM. I've seen PRD systems with all of 16CPUs but 1.5TB RAM.
DanNeely - Tuesday, April 14, 2020 - linkAVX is a compute feature. Rendering and math heavy scientific/engineering workloads are where it'd shine. Databases, typical webservers, and most other 'conventional' business related software don't care.
Shorty_ - Thursday, April 16, 2020 - linkWeb serving is another place where frequency really helps. I run threadrippers with ECC UDIMM for php hosting for this express reason
Mikewind Dale - Tuesday, April 14, 2020 - linkUnfortunately, this breaks AMD's trend of being cheaper than Intel. A 20 core Xeon Xeon Gold 5218R boosts up to 4.0 GHz and costs $1273. This new EPYC is only 16 core, boosts only up to 3.9 GHz, and costs $3100.
Usually, AMD is cheaper than Intel, but this seems to be an exception. A pity.
Fataliity - Tuesday, April 14, 2020 - linkThat's because its a specialized processor. If you are buying one of these, you won't be worried about the price.
To get that much cache, they are using 6-8chiplets. So as many as their top of the line products. So yeah, its going to cost more because theres more silicon.
schujj07 - Tuesday, April 14, 2020 - linkThe 5218R that you referenced isn't what the 7F52 is competing against. With a base clock of 2.1GHz the 5218R isn't a frequency optimized part. Most of Intel's CPUs have high boost clocks and middle of the road base clocks. The actual competition is the 6246R which has a 3.4GHz base and 4.1GHz boost clock. These high base clocks are for sustained performance in a given scenario.
MFinn3333 - Tuesday, April 14, 2020 - linkThat’s is also because it has about 12x as much L3 cache per CPU core. A combined 256MB vs 30MB cache size speaks for itself.
edzieba - Tuesday, April 14, 2020 - linkIt's down to two design choices: process choice, and core choice.
AMDs hands are somewhat tied when it comes to process choice. They get what TSMC has on offer, and what TSMC has on offer is geared towards mobile devices because that's where the volume market is. The high-performance variants are variants, rather than the baseline.
But even in general, as you shrink your process from 21nm on down, it gets harder and harder to clock up. Gate oxide thickness hit its limit generations ago, which is why gate voltage has remained near constant (~1.1v) for so long. This is only going to get harder as processes shrink further while being stuck with the constant gate oxide thickness but trying to cram closer together without interfering.
In AMD's hands is the design goal of cramming as many cores as possible in. Great for multi-core workloads, but not so great for single core speed. Getting CPUs to clock higher means using multiple transistors per gate (2-3 or even more as processes shrink), and AMD figured they may as well use these transistors for more cores instead of faster cores. The obvious downside is the difficulty in getting Zen cores to even approach 5GHz (with Zen 2 being notable for getting above 4GHz without overkill cooling), and that any workloads that do not span beyond one thread leave those transistors sitting idle.
twtech - Tuesday, April 14, 2020 - linkOn the 7H12 - Dell offers it in their EPYC servers, such as the R7525. It's currently about a $375 upgrade over the 7742.