Our review of the Boston Viridis, one of the first Calxeda ECX-1000 based servers, was a pretty weird one. Instead of trying out different server workloads, we deliberately went for one of the few scenarios where the server might make sense: hosting light webservers. There were a few others like Content Delivery Network server or storage server, but those were about it. The quad ARM Cortex A9 inside the ECX-1000 was faster than the contemporary Atom SoCs, but missed the RAM capacity and raw performance of low power Xeons to be an alternative in most server workloads. The measured (!) 8 Watt per server node was however simply spectacular and the network fabric was one of the best in the industry. Calxeda was on the right track - they only needed more RAM and single thread performance in a server node. 

Calxeda has announced its second generation server SoC yesterday, the EnergyCore ECX-2000. Based upon the more powerful ARM Cortex A15, this new SoC should be able to deliver up to twice as much performance at 1.8 GHz than the ECX-1000 at 1.4 GHz and offer four times more RAM (16 GB per node). Although we will not believe the performance claims until we have tested them ourselves, it is not impossible to speculate. Anand compared the Google Nexus 10 with the Samsung Galaxy Tab 3 8.0: the former has a Samsung Exynos 4 based upon a dual Cortex A15 at 1.7 GHz inside, the latter a very similar Samsung design, the 4212 based upong a dual Cortex A9 at 1.5 GHz. 

Benchmark A15 vs A9
Sun Spider 1.0 140%
Mozilla Kraken 176%
Octane v1 168%

It is impossible to estimate the performance of server SoCs by looking at browser benchmarks on tablet SoCs, but it gives us rough idea of how much extra crunching power the A15 delivers. At 7-zip.com we can compare an A15 at 1.7 GHz (Samsung Exynos 5250) with an A9 at 1.4 GHz (Samsung Exynos 4412):

Benchmark A9 A15 A15 vs A9
LZMA compression 1200 2270 189%
LZMA decompression 2400 3560 148%

As we posted before, the LZMA compression does have some similarities with typical server workloads. A Xeon "Sandy Bridge EP" 1.8 GHz scored 2793 with one thread, an EnergyCore ECX-1000 at 1.4 GHz scored 833 according to our own benchmarking. So we can estimate that a ECX-2000 would probably score around 1600, or similar to a modern Xeon at 1 GHz. Not earth shattering, but when you start looking at power consumption these numbers start to make sense.


While the ECX-1000 needed 5 (1.1 GHz) to 6W (1.4 GHz per SoC), according to Calxeda the ECX-2000 needs about 7 to 10W (1.8 GHz). This equates to about 2.5 W per 1.8 GHz core. The best low power Xeon, the Xeon E3-1230L V3, has 4 cores (with HT) at 1.8 GHz with a TDP of 25W, or around 6W per physical core. Even though we do not know exactly what kind of server performance the ECX-2000 at 1.8 GHz will deliver, the limited data that we have makes it very likely that the ECX-2000 is going to be very interesting from a performance/watt point of view.

Of course, the real challenge will be the newly released Intel Atom C2000. Let us compare the new Calxeda SoCs with Intel's second generation of Server SoCs.

Intel Atom C2000 versus Calxeda ECX-2000
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  • davegraham - Tuesday, October 29, 2013 - link

    Johan, what will additionally be interesting is AMD's Seattle cores launching around the beginning of next year. the multi-core ARM architectures, integrated FreedomFabric and 10GbE on SoC, etc. will be a powerful combination. those too will be integrated into Moonshot. (heck, even the AMD X-series compares pretty well here...)
  • JohanAnandtech - Wednesday, October 30, 2013 - link

    Looking forward to that AMD's Seattle too. I hope however that they will not be limited to the current SeaMicro boxes: those servers are extremely well designed hyperscale servers, but they are a massive investment for a large part of the market (most of our readers :-). Few of the web services providers are willing to shell out so much money (see Google, Facebook's minimal servers)
  • hoboville - Tuesday, October 29, 2013 - link

    These low power high core count processors like the C2730 are interesting for SOHO NAS units. The core count and RAM capacity are also really interesting for VM platforms that use simple point of sale interfaces, since they aren't demanding in terms of calculation performance. Also, blade racks for virtualizing call centers and basic productivity remote desktops would see a boon from a high RAM and core count setup.

    There's a lot of potential, but they only support VT-x so advanced VM setups need not apply. Kind of disappointing, but I guess they want you to buy into Xeon. Still beats ARM though in terms of capacity (RAM, cores, etc).
  • JohanAnandtech - Wednesday, October 30, 2013 - link

    The RAM capacity is still very limited for VM platforms. Two low voltage Xeons can offer up to 384 GB, 768 GB with LR DIMMs.
  • theduckofdeath - Wednesday, October 30, 2013 - link

    64GB available for 8 lightweight cores is more than enough, I think. It's not like these systems will be used for heavy duty stuff like a Xeon-based server.
  • dylan522p - Tuesday, October 29, 2013 - link

    Why did you ignore the Xeon that is Silcermont based?
  • JohanAnandtech - Tuesday, October 29, 2013 - link

    I am not sure what you mean but I fixed the table where Silvermont moniker was missing
  • dylan522p - Tuesday, October 29, 2013 - link

    Ya sorry. That was ignorance on my part.
  • pikeike - Tuesday, October 29, 2013 - link

    Anyone know of any small (around nano-itx or pico-itx sized) boards that have Intel Atom Rangeley chips and dual GigE ports? I don't need any video out. A serial port is good enough for the project I'm planning on doing.

  • idos422 - Tuesday, October 29, 2013 - link

    The smalled Silvermont based board with dual GigE I've found is this nano-ITX one using the embedded versions (Bay Trail I): http://www.portwell.com/products/detail.asp?CUSTCH...

    Too bad it has the GPU in it that's going to go unused. I'm sure this industrial application targeted board will probably cost the same as a larger Haswell based setup.

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