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CPU Speed or Cores for Terminal Server

Posted on 2013-05-31
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Last Modified: 2013-05-31
I am building a new server to host Windows Server 2012 Terminal Server in Hyper-V sessions.  This will be an IBM x3550 with two CPUs.

We plan to host about 50 total users in two seperate VMs.

For the same amount of money, I can get 8 core CPUs with 20 MB cache running at 2.1 GHz or I can get 4 core CPUs with 10 MB cache running at 3.3 Ghz.

What is more important for terminal server, cores or speed?
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Question by:richn
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by:Haresh Nikumbh
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by:richn
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That test was for VDIs.  Do we know is the same holds true for traditional terminal services sessions?
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andyalder earned 350 total points
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With anything that involves a large number of threads such as terminal server cores always win over clock speed because each thread (and therefore each core) spends a lot of its time waiting on I/O. For the same reason you should enable hyperthreading so it can push the thread that's waiting on I/O to one side and run another thread on that core instead.

http://globalsp.ts.fujitsu.com/dmsp/Publications/public/Terminal_Server_Sizing_Guide_EN.pdf
Page 16(46) shows little difference (about 10%) between 2.0 and 3.16GHz but page 20(46) shows good scaling (70%) when doubling the number of cores.
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by:Haresh Nikumbh
ID: 39211722
correct that test was done for vdi. .if its such performance for vdi then ofcourse you get better on physical
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by:richn
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Thanks for the quick answers.
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