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I’m considering buying an Intel Core i7-4790, which has 4 cores and 8 threads.

With a 4 core, 8 thread CPU you should see 8 CPU available in the green slider area; see picture below. I set the slider to one per virtual machine. Afterwards I try to run 8 virtual machines at the same time.

Does this mean each virtual machine will use one thread or will each virtual machine use a full core?

Please have a look at this picture for reference:

enter image description here

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    Unless you pin VCPUs to CPUs (as seen by the OS), they can be executed on any physical CPU. – Daniel B Mar 6 '15 at 15:50
  • If you had 4 cores, and 4 VMs were using 1 core each, exclusively, then the world would implode since the host also needs CPU resources. ;) Anyhow, each VM will use multiple threads, even if they're using only one Core, so your question (as-is) is a little off-kilter, and doesn't really show any research effort. – Ƭᴇcʜιᴇ007 Mar 6 '15 at 15:58
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Each CPU from this screenshot is physically a thread and for the guest OS it is presented as a virtual core (a single-threaded core, not an HT core).

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