Overview of the Competitors

Let's sum everything up in one big table.

ARM/Intel SoC 2015 Comparison
SoC Intel Xeon-D Intel Atom C2000 AppliedMicro X-Gene 1
(X-Gene 2)
AMD A1100 Cavium Thunder-X Broadcom Vulcan
Architecture Broadwell Silvermont Storm (ShadowCat) A57 Thunder-X Vulcan
8 (16)
Max. CPU Clockspeed GHz 2.4GHz 2.4GHz
2GHz 2.5 Ghz 3GHz
Process technology Intel 14nm Intel 22nm TSMC 40nm
(TSMC 28nm)
GF 28nm GF 28nm TSMC 16nm
L1 Cache 32KB I
32KB D
32KB I
24KB D
32KB I (*)
32KB D (*)
48KB I
32KB D
78KB I
32KB D
32KB I
32KB D
Decode 4 2 4 3 2 4
Max. IPC (int) 5 2 4 3 2 4
Exe Ports 8 4 8 8 4? 6
Max. FP Performance 2x 256 bit 1x 128 bit 2x 128 bit 2x 128 bit 2x 128 bit 2x 128 bit
OoO buffer 192 32 >100 128 40 180
L2 Cache 8x 256KB 4x 1MB 4x 256KB? (*) 4x 1MB 16MB 20x 256KB
L3 Cache 8MB? - 8MB 8MB - ?
Max. RAM 128GB 64GB 128GB 128GB 1TB ?
Memory Bus Width 2x 64-bit 2 x 64-bit 4x 64-bit 2x 64-bit 4x 64-bit 4x 64-bit
DRAM (best) DDR4-
TDP (top SKU) 45W 20W 40W
(25 W?)
25W +/- 95 W ?
Available Q2-Q3
(Q2 2015?)

(*) Deduced from Ganesh's article about the Helix SoCs

These are paper specifications of course, so they should be interpreted with a grain of salt. It looks like the AMD A1100 should top the Atom C2000 and go after the low end of the Xeon E3. AMD's Opteron A1100 is already available, but the current development kits do not hit the clock speed and performance targets.

The Thunder-X single-threaded performance in "traditional workloads" might only be at the level of the Atom C2000, but scale-out and network/crypto acceleration could give some remarkable results in certain workloads. The Cavium SoC is the hardest to predict and will show a very variable performance profile as it also incorporates many very specialized hardware accelerators. The Thunder-X reference servers are announced and should be available in the coming weeks.

The X-Gene is currently the widest ARM architecture with extra hardware acceleration mostly focused on networking. The X-Gene TDP was great on paper (25W when announced) but there are many indications (40W TDP) that AppliedMicro really needs the 28nm X-Gene 2 to be truly competitive in the performance/watt battle arena. The X-Gene 2 should be available around Q2 2015.


Intel's Response First Performance Measurements


View All Comments

  • hojnikb - Tuesday, December 16, 2014 - link

    Wow, i have never motherboard that simple :) Reply
  • CajunArson - Tuesday, December 16, 2014 - link

    OK you devote another huge block of text to the typical x86 complexity myth* followed by: Oh, but the ARM chips are superior because they have special-purpose processors that overcome their complete lack of performance (both raw & performance per watt).

    Uhm... WTF?? I need to have a proprietary, poorly documented add-on processor to make my software work well now? How is that a "standard"? How is requiring a proprietary add-on processor that's not part of any standard and requires boatloads of software cruft working in a "reduced instruction set architecture" exactly?

    I might as well take the AVX instruction set for modern x86... which is leagues ahead of anything that ARM has available, and say that x86 is now a "RISC" architecture because the AVX part of x86 is just as clean or cleaner than anything ARM has. I'll just conveniently forget about the rest of x86 just like the ARM guys conveniently forget about all the non-standard "application accelerators" that are required to actually make their chips compete with last-year's Atoms.

    * Maybe in a micro-controller setting where you are using a PIC or Arduino the x86 decoding is a real issue, but in a server? Please. Considering the only hard numbers you have show a 2013-model Atom beating a 2015-model ARM server processor, you'll have to try harder.
  • hlmcompany - Tuesday, December 16, 2014 - link

    The article describes ARM chips as becoming more competitive, but still lagging behind...not that they're superior. Reply
  • Kevin G - Tuesday, December 16, 2014 - link

    The coprocessor idea is something stems from mainframe philosophy. Historically things like IO requests and encryption were always handled by coprocessors in this market.

    The reason coprocessors faded away outside of the mainframe market is that it was generally cheaper to do a software implementation. Now with power consumption being more critical than ever, coprocessors are seen as a means to lower overall platform power while increasing performance.

    Philosophically, there is nothing that would prevent the x86 line from doing so and for the exact same reasons. In fact with PCIe based storage and NVMe on the horizon in servers, I can see Intel incorporating a coprocessor to do parity calculations for RAID 5/6 in there SoCs.
  • kepstin - Tuesday, December 16, 2014 - link

    Intel has already added some instructions in avx and avx2 that vastly improve the performance of software raid5 and 6; the Haswell chip in my laptop has the Linux software raid implementation claiming 24GiB/s raid5 with avx, and 23GiB/s raid6 with avx2 (per core). Reply
  • MrSpadge - Tuesday, December 16, 2014 - link

    Of course additional power draw for more complex instruction deconding mattes in servers: today they are driven by power-efficiency! The transistors may not matter as much, but in a multi-core environment they add up. Using the quoted statement from AMD of "only 10% more transistors" means one could place 11 RISC cores in the same area for the same cost as 10 otherwise identical x86 cores. Johan said it perfectly with "the ISA is not a game changer, but it matters".

    And you completely misunderstood him regarding the accelerators. Intel is producing "CPUs for everyone" and hence only providing few accelerators or special instructions. In the ARM ecosystem it's obvious that vendors are searching niches and are willing to provide custom solutions for it - hence the chance is far higher that they provide some accelerator which might be game-changing for some applications.

    This doesn't mean the architecture has to rely entirely on them, neither does it mean they have to be undocumented. The accelerators do not even have to be faster than software solutions, as long as they're easy enough to work with and provide significant power savings. Intel is doing just that with special-purpose hardware in their own GPUs.

    And don't act as if much would have changed in the Atom space ever since 22 nm Silvermont cores appeared. It doesn't matter if it's from 2013 or 2015 - it's all just the same core.
  • OreoCookie - Tuesday, December 16, 2014 - link

    What's with all the unnecessary piss and vinegar?

    All CPU vendors rely increasingly on specialized silicon, newer Intel CPUs feature special crypto instructions (AES-NI) and Quick Sync, for instance. Adding special purpose hardware to augment the system (in the past usually done for performance reasons) is quite old, just think of hardware RAID cards and video »accelerators« (which are not called GPUs). The reason that Intel doesn't add more and more of these is that they build general purpose CPUs which are not optimized for a specific workload (the article gives a few examples). In other environments (servers, mobile) the workload is much more clearly defined, and you can indeed take advantage of accelerators.

    The biggest advantage of ARM cpus is flexibility -- the ARM ecosystem is built on the idea to tailor silicon to your demands. This is also a substantial reason why Intel's efforts in the mobile market have been lackluster. Recently, Synology announced a new professional NAS (the DS2015xs) which was ARM-based rather than Intel-based. Despite its slower CPU cores, the throughput of this thing is massive -- in part, because it sports two (!) 10 GBit ethernet ports out of the box. Vendors are looking for niches where ARM-based servers could gain a foothold, so they are trying a lot of things and see what sticks.
  • goop666666 - Saturday, December 20, 2014 - link

    LOL! Most of the comments here like this one seem to be written by people who think computers should all be like gaming machines or something.

    Here'a tip: no-one cares about "complexity," "standardization," "RISC," or anything else you mention. All they care about in the target market for ARM server chips is price, performance and power, and I mean ALL THREE.

    On this Intel cannot compete. They sell wildly overpriced legacy hardware propped up by massive R&D expenditures and they're wedded to that model. The rest of the industry is wedded to the new and cheap model. Just like how the industry moved to mobile devices and Intel stood still, this change will also wash over Intel while they sit still in denial.

    There's a reason why Intel stock has gone no-where for years.
  • nlasky - Monday, December 22, 2014 - link

    Jan 8, 2010, Intel stock price $20.83. Dec 19, 2010, Intel stock price $36.37. If by gone no-where in for years you mean increased by 70% I guess you would be correct. Intel can't compete because they are wedded to their model? They have a profit margin of 20% and an operating margin of 27%. They could easily cut prices to compete with any ARM offerings. Servers have been around forever, unlike the mobile computing platform. Intel has an even larger stranglehold on this industry than ARM has in the mobile space. Here's a tip - stop spewing a bunch of uniformed nonsense just to make an argument. Reply
  • nlasky - Monday, December 22, 2014 - link

    *Dec 19, 2014 Reply

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