A few months ago, the first server-based Atom emerged. Based on Atom Z530 models to a single core, and limited by the chipset "Poulsbo." With the Z530, the company SeaMicro was limited to 1 GB of RAM per card, two PCI-Express x1 links classical and 32-bit mode. The next version of the server should switch to the new generation of Atom N570 with models (not yet announced).
The advantages are many: each processor with 2 cores, the frequency is higher (1.66 GHz against 1.6 GHz), 64 bits is part of the chipset and is much more advanced. First, the memory controller built into the processor supports 4 GB of RAM, then the chipset (TigerPoint) has 4 PCI-Express (250 MB / s), configurable as a single link 4x, which allows interconnection more effectively.
In practice, the company offers a 10U server containing 512 cores (256 processors) and capable of running 1024 threads (via HyperThreading) with a relatively low consumption, the processors have a TDP which is around 10 W. For companies that do not need raw power (for storage, for example) is far more interesting than the Xeon-based servers, even if they are significantly faster.
In the best case, with 1U servers featuring dual Xeon processors, you get to 160 cores and 320 threads in the same volume with consumption explodes (and higher power). It remains to see the price of the solution and the performance of disk subsystem and network subsystem. 
The advantages are many: each processor with 2 cores, the frequency is higher (1.66 GHz against 1.6 GHz), 64 bits is part of the chipset and is much more advanced. First, the memory controller built into the processor supports 4 GB of RAM, then the chipset (TigerPoint) has 4 PCI-Express (250 MB / s), configurable as a single link 4x, which allows interconnection more effectively.
In practice, the company offers a 10U server containing 512 cores (256 processors) and capable of running 1024 threads (via HyperThreading) with a relatively low consumption, the processors have a TDP which is around 10 W. For companies that do not need raw power (for storage, for example) is far more interesting than the Xeon-based servers, even if they are significantly faster.
In the best case, with 1U servers featuring dual Xeon processors, you get to 160 cores and 320 threads in the same volume with consumption explodes (and higher power). It remains to see the price of the solution and the performance of disk subsystem and network subsystem.
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