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Is eXtreme Transaction Processing (ie In-Memory OLTP) Supported?

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Someone recently asked under which circumstances SQL Server 2014 would return false when interrogated for the IsXTPSupported server property.

I looked into the source code and this is what I encountered there. For the boxed version of SQL14, that server property would return FALSE if:

1) lightweight pooling (fiber mode) is enabled,

2) the instance is not one of the SKUs where the feature is supported (Enterprise, Developer, or Evaluation), or

3) the PF_COMPARE_EXCHANGE128 processor feature is not supported by the computer where SQL Server is running.