1. Yes, that is correct. It does not have the option of a second CPU.
2. If you are talking about a different model of server - one that supports two CPU's - then yes, you could end up with the same processing cores and "roughly" the same performance with a 1x8 or 2x4, although heavy multi-threaded workloads will benefit from two physical CPU's over cores.
3.
Memory
Because the memory controller is now in the chip, more processors gives you access to more memory; a two-socket server will have two memory banks, each belonging to a processor, so if one socket is not populated, its memory bank cannot be used.
Cost
Fewer cores per chip is much cheaper, so if you needed 8 cores, 1x8 will likely cost $1000, while 2x8 would likely cost $500 (2x$250):
(Also note that cache is usually attached to cores, so the fewer cores, the less overall cache, although the amount of cache per core typically stays constant.)
Application
If you are using some single-threaded application, then only clock speed matters, not cores, so it depends on what you will be doing. Workloads like this aren't common but do exist.
theflash1932
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August 11th, 2014 09:00
1. Yes, that is correct. It does not have the option of a second CPU.
2. If you are talking about a different model of server - one that supports two CPU's - then yes, you could end up with the same processing cores and "roughly" the same performance with a 1x8 or 2x4, although heavy multi-threaded workloads will benefit from two physical CPU's over cores.
3.
Memory
Because the memory controller is now in the chip, more processors gives you access to more memory; a two-socket server will have two memory banks, each belonging to a processor, so if one socket is not populated, its memory bank cannot be used.
Cost
Fewer cores per chip is much cheaper, so if you needed 8 cores, 1x8 will likely cost $1000, while 2x8 would likely cost $500 (2x$250):
1x8 ($1100):
http://ark.intel.com/products/75264/Intel-Xeon-Processor-E5-2450-v2-20M-Cache-2_50-GHz
2x4 ($300x2=$600):
http://ark.intel.com/products/75787/Intel-Xeon-Processor-E5-2609-v2-10M-Cache-2_50-GHz
(Also note that cache is usually attached to cores, so the fewer cores, the less overall cache, although the amount of cache per core typically stays constant.)
Application
If you are using some single-threaded application, then only clock speed matters, not cores, so it depends on what you will be doing. Workloads like this aren't common but do exist.