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set maxdop > # logical processors?

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Is there a way to set maxdop to a value greater than the number of schedulers on the system?  I've got a VM with 4 vCPU that has a fairly low user concurrency but the queries that are run require lots of IO so the threads typically spend most of their time in IO wait.  There is a fairly large group of SSDs behind the LUNs for this VM and I'd like to be able to throw a lot more threads at it without having to allocate gobs of vCPU just to see the CPU utilization at 5%.

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