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)
  Cores
Threads
Frequency (GHz) L3 TDP Price
Base Max
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)
  Cores
Threads
Frequency (GHz) L3 TDP Price
Base Max
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)
  Cores
Threads
Frequency (GHz) L3 TDP Price
Base Max
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)
  Cores
Threads
Frequency (GHz) L3 TDP Chiplets Cores
per
CCX
Price
Base Max
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
AMD
7F52 (2P)
AMD
7601
AnandTech Intel
8280
Intel
6226R (2P)
2 x 16 / 32 32 / 64 Cores / Threads 28 / 56 2 x 16 / 32
3500 2200 Base Frequency 2700 2900
3900 3200 Turbo Frequency 4000 3900
2 x 256 MB 64 MB L3 Cache 38.5 MB 2 x 22 MB
DDR4-3200 DDR4-2666 DRAM Support DDR4-2933 DDR4-2933
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.

 

Frequency Ramp, Latency and Power
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  • Threska - Wednesday, April 15, 2020 - link

    Not specifically in this niche, but ARM (and equivalent) haven't gone anywhere. Reply
  • bananaforscale - Wednesday, April 15, 2020 - link

    Expecting EPYC F7U12. Reply
  • efferz - Wednesday, April 15, 2020 - link

    the IPC of 9900KS is 1.56/G while the 6226R is 1.05/G? Reply
  • AntonErtl - Thursday, April 16, 2020 - link

    Why buy an EPYC 7F52 rather than some other AMD CPU?

    Compared to a Ryzen 9 3950X? You need more than 128GB RAM, more than 4MB cache/core or more DRAM bandwidth; as for clock, they have the same base clock, and the 3950X has quite a bit more max clock.

    Compared to a Threadripper 3960X (and not use, maybe deactivate 8 cores)? You need more then 256GB RAM, more than 8MB cache per core, or more RAM bandwidth; clockwise, the Threadripper is better in every way.

    Compared to another Rome EPYC? You want 256MB cache, but want to pay less than for a 7642 or a 7702P; or you want a higher clock rate than other 16-core EPYCs offer.

    This all seems quite specialized to me; I guess there are some supercomputing or database applications that benefit from high DRAM capacity and bandwidth and big caches; but if an application is DRAM-limited, it usually does not need high clocks (waiting for memory at a higher clock rate does not make the DRAM access significantly faster).

    As for benchmarks, I guess Stream will show up the RAM bandwidth, but there it will perform like any other Rome EPYC.
    Reply
  • scineram - Friday, April 17, 2020 - link

    Ok, so how successful was the 7371? Reply
  • eastcoast_pete - Monday, April 20, 2020 - link

    @Ian (Dr. Cutress): Again, appreciate your reviews! Question: Could you do a review of a Ryzen on the exact opposite end of the price scale, namely the Ryzen 3 1200? It is now Zen+, fabbed in GloFo's 12 nm LP process, and around or under $ 50. Not bad for 4 cores, especially if you have a dGPU and a compatible board at hand. Just make sure to update the BIOS as needed before installing the CPU. Reply
  • dwade123 - Tuesday, April 21, 2020 - link

    Overpriced junk Reply
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  • OldSoul1508 - Thursday, May 14, 2020 - link

    Great site! Thank for this information, I am enlightened now about the fast processor to choose.

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    Reply

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