virtualbox.org

Hong wrote:the Acceleration tab nder Settings > System is grayed out (4.3.30)

That means the VM is not powered off.

noteirak wrote:How did you get there?
I said that the text from Genymotion, extracted into a quote 2 replies above mine is a dumb version of the warning in the VirtualBox manual.

Genymotion version is less precise which makes it missleading, including their poor choice of words.
VirtualBox verison is detailed and clear in what is and is not possible.

Actually what I should have said is, Genymotion's warning is the same thing we all have said to users thousands of times. Instead of something like "You can run Hyper-V and VirtualBox together, just not very well."

But that's not what we say. We shorten it to "Disable Hyper-V".

noteirak wrote:

Hong wrote:the Acceleration tab nder Settings > System is grayed out (4.3.30)

That means the VM is not powered off.

In VirtualBox 4.3.x the Acceleration tab is also greyed out when the host doesn't support VT-x and only 32-bit VMs are available (as is the case with this Hyper-V + Genymotion discussion).

I think the mystery is resolved. Genymotion can clearly be installed and used under Hyper-V, but no VT-x is available for the devices and they run 32-bit OSs in the VMs. Hong's and my experiences prove this.

Makes one wonder how much better they would run with Hyper-V disabled. At least it makes me wonder.

I have not done any benchmark test to compare running VirtualBox with and without Hyper-V disabled. I ran VirtualBox5.0 only briefly with Hyper-V disabled. I remember it was fast. I am running it with Hyper-V enabled. I don't think the difference is dramatic. However, it is certainly dramatically faster than Google's official Android emulators, and this is why I choose Genymotion. My machine has an Intel quad-core i5-3570K 3.40 GHz, 16GB RAM.

Thank you Hong. it was a somewhat rhetorical question but the info is good to know.