If you examine the CPU industry and ask where the big money is, you have to look at the server and datacenter market. Ever since the Opteron days, AMD's market share has been rounded to zero percent, and with its first generation of EPYC processors using its new Zen microarchitecture, that number skipped up a small handful of points, but everyone has been waiting with bated breath for the second swing at the ball. AMD's Rome platform solves the concerns that first gen Naples had, plus this CPU family is designed to do many things: a new CPU microarchitecture on 7nm, offer up to 64 cores, offer 128 lanes of PCIe 4.0, offer 8 memory channels, and offer a unified memory architecture based on chiplets. Today marks the launch of Rome, and we have some of our own data to share on its performance.

Review edited by Dr. Ian Cutress

First Boot

Sixty-four cores. Each core with an improved Zen 2 core, offering ~15% better IPC performance than Naples (as tested in our consumer CPU review), and doubled AVX2/FP performance. The chip has a total of 256 MB of L3 cache, and 128 PCIe 4.0 lanes. AMD's second generation EPYC, in this case the EPYC 7742, is a behemoth.

Boot to BIOS, check the node information.

[Note: That 1500 mV reading in the screenshot is the same reading we see on consumer Ryzen platforms; it seems to be the non-DVFS voltage as listed in the firmware, but isn't actually observed]

It is clear that the raw specifications of our new Rome CPU is some of the most impressive on the market. The question then goes to whether or not this is the the new fastest server chip on the market - a claim that AMD is putting all its weight behind. If this is the new fastest CPU on the market, the question then becomes 'by how much?', and 'how much does it cost?'.

I have been covering server CPUs since the launch of the Opteron in 2003, but this is nothing like I have seen before: a competitive core and twice as much of them on a chip than what the competition (Intel, Cavium, even IBM) can offer. To quote AMD's SVP of its Enterprise division, Forrest Norrod

"We designed this part to compete with Ice Lake, expecting to make some headway on single threaded performance. We did not expect to be facing re-warmed Skylake instead. This is going to be one of the highlights of our careers"

Self-confidence is at all times high at AMD, and on paper it would appear to be warranted. The new Rome server CPUs have improved core IPC, a doubling of the core count at the high end, and it is using a new manufacturing process (7 nm) technology in one swoop. Typically we see a server company do one of those things at a time, not all three. It is indeed a big risk to take, and the potential to be exciting if everything falls into place. 

To put this into perspective: promising up to 2x FP performance, 2x cores, and a new process technology would have sounded so odd a few years ago. At the tail end of the Opteron days, just 4-5 years ago, Intel's best CPUs were up to three times faster. At the time, there was little to no reason whatsoever to buy a server with AMD Opterons. Two years ago, EPYC got AMD back into the server market, but although the performance per dollar ratio was a lot better than Intel's, it was not a complete victory. Not only was AMD was still trailing in database performance and AVX/FP performance, but partners and OEMs were also reluctant to partner with the company without a proven product.

So now that AMD has proven its worth with Naples, and AMD promising more than double the deployed designs of Rome with a very quick ramp to customers, we have to compare the old to the new. For the launch of the new hardware, AMD provided us with a dual EPYC 7742 system from Quanta, featuring two 64-core CPUs.

Zen 2 and Rome: SMILE For Performance
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  • Zoolook - Saturday, August 10, 2019 - link

    It's been a pretty good investment for me, bought at 8$ two years ago, seems like I'll keep it for a while longer.
  • CheapSushi - Wednesday, August 7, 2019 - link

    It's glorious...one might say.... even EPYC.
  • abufrejoval - Wednesday, August 7, 2019 - link

    Hard to believe a 64 core CPU can be had for the price of a used middle class car or the price of four GTX 2080ti.

    Of course once you add 2TB of RAM and as many PCIe 4 SSDs as those lanes will feed, it no longer feels that affordable.

    There is a lot of clouds still running ancient Sandy/Ivy Bridge and Haswell CPUs: I guess replacing those will eat quite a lot of chips.

    And to think that it's the very same 8-core part that powers the engire range: That stroke of simplicity and genius took so many years of planning ahead and staying on track during times when AMD was really not doing well. Almost makes you believe that corporations owned by share holders can actually sometimes actually execute a strategy, without Facebook type voting rights.

    Raising my coffee mug in a salute!
  • schujj07 - Thursday, August 8, 2019 - link

    Sandy Bridge maxed out at 8c/16t.
    Ivy Bridge maxed out at 15c/30t.
    Haswell maxed out at 18c/36t.
    That means that a single socket Epyc 64c/128t can give you more CPU cores than a quad socket Sandy Bridge (32c/64t) or Ivy Bridge (60c/120t) and only a few less cores that a quad socket Haswell (72c/144t).
  • Eris_Floralia - Wednesday, August 7, 2019 - link

    This is what we've all been waiting for!
  • Eris_Floralia - Wednesday, August 7, 2019 - link

    Thank you for all the work!
  • quorm - Wednesday, August 7, 2019 - link

    Given the range of configurations and prices here, I don't see much room for threadripper. Maybe 16 - 32 cores with higher clock speeds? Really wondering what a new threadripper can bring to the table.
  • willis936 - Wednesday, August 7, 2019 - link

    A reduced feature set and lower prices, namely.
  • quorm - Wednesday, August 7, 2019 - link

    Reduced in what way, though? I'm assuming threadripper will be 4 chiplets, 64 pcie lanes, single socket only. All ryzen support ecc.

    So, what can it offer? At 32 cores, 8 channel memory becomes useful for a lot of workloads. Seems like a lot of professionals would just choose epyc this time. On the other end, I don't think any gamers need more than a 3900x/3950x. Is threadripper just going to be for bragging rights?
  • quorm - Wednesday, August 7, 2019 - link

    Sorry, forgot to add, 3950x is $750, epyc 7302p is $825. Where is threadripper going to fit?

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