24 cores in a CPU for the new Intel Xeon Broadwell-EX solutions

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The American company announces the new declination of processors for high-end server systems, increasing the number of maximum core considerably thanks to the technology transition to 14 nanometers

Pass 24 as the highest, from the previous 18 cores that can be made available by the next-generation Xeon processor E7 family. We speak of the Xeon E7-8800 v4 and  Xeon E7-4800 v4  models that Intel has officially announced these days, based on the architecture known by the codename of Broadwell-EX code.

These solutions are offered by Intel for higher-end servers multisocket systems, while maintaining compatibility with the platforms of Brickland family-based CPU Xeon E7 8800 v3 and 4800 previous generation v3 provided to update the BIOS on the motherboard. The microarchitecture at the base of these CPUs is that Broadwell, with production technology to 14 nanometers: this has allowed to increase the number of core up to a maximum of 24 for the socket, with a parallel increase in the amount of cache LLC (Last Level Cache) integrated into the processor.

In the cache end models reach a total capacity of 60 Mbytes, compared with 45 Mbytes of the previous generation proposals based on Haswell-EX architecture. Not so changes its cache amount, which is equal to 2.5 Mbytes per core integrated in the processor.

xeon_e7_ex_broadwell

Does not change the memory controller, always of type quad channel DDR4 with the possibility of installing up to 3 memory modules for each channel so as to reach a maximum capacity of 24 modules per processor socket. The resultant is that it can reach a maximum of 12 Terabytes which system allocation of memory, combining 96 DIMMs on a 4-socket platform.

In addition to a third integrated link QPI in each processor, a feature that allows in a quad configuration socket to each processor to communicate directly with the 3 remaining, we find also the insertion of the COD mode (Cluster On Die) also for 4-socket configurations. This feature allows you to increase the speed performance by dividing the core, the last level cache the home agents in distinct clusters that operate within a NUMA domain. In this way, the latency is reduced access to the LLC, with a positive impact on speed performance. Haswell-EX processors in the COD mode was present but restricted to 2-socket configurations.

Intel positions the new processors between the higher-end solutions, live confrontations with Power8 Intel CPU based systems. In comparison with these Intel architectures declares speed performance equal to 1.4x, a consumption which can reach half and a relationship between performance and cost that is higher up to 10 times. The prices are very far from those customary for consumer solutions: starting from a minimum of $ 3,000 up to above 7000 for the declination with 24 core and TDP of 165 watts.

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