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https://serverfault.com/questions/124056/no-dual-cpu-support-for-virtualbox-with-a-cpu-that-doesnt-support-multicore/124087
It sounds like VirtualBox doesn’t support multiple virtual CPUs on your processor. I know it works on all modern machines I’ve tried, but if your processor is socket 604, it’s quite old. Have you tried creating a new clean VM as a last resort? As another option, set it to a different OS like Windows 2003 instead of Windows XP.
https://www.mihaimatei.com/virtualbox-performance-issues-multiple-cpu-cores/
Running a development environment inside a VirtualBox Debian, for serving Magento with NGiNX revealed a tremenduous slow performance when VirtualBox was configured to use more than one core, as any enthusiast with a multi-core recent generation CPU would intend to set it.
https://superuser.com/questions/33723/getting-2-processors-to-work-with-virtualbox-on-dual-core-celeron
Virtualbox v3.0.4. is going way too slow on one core and the slider is grayed out to disallow me from adding my second processor. I'm not really certain why it doesn't work with 2, I've looked at some sources that say older dual-core celerons may not support hardware virtualization.
https://forums.virtualbox.org/viewtopic.php?t=24823&start=0
I have a desktop PC that supports VT-x and has single dual core processor. I have virtual machine that had 1 CPU defined. Now I have changed in VirtualBox GUI to 2 CPUs. Starting guest OS and I still see only one CPU (single column in Windows Task Manager). Is this OK? What does it means "Processors" in VirtualBox?
https://www.quora.com/Does-the-Intel-Pentium-processor-support-VirtualBox
Mar 13, 2018 · Virtualbox should run on all current Intel Pentium processors released in the past 10 years or so. However, virtualisation will be slow on models which don’t have Intel VT-x enabled, i.e most Pentium 4 and Pentium Dual core (Core 2 based) processo...
http://www.virtualbox.org/manual/ch03.html
Oracle VM VirtualBox supports symmetrical multiprocessing (SMP) and can present up to 32 virtual CPU cores to each virtual machine. You should not configure virtual machines to use more CPU cores than are available physically.
https://www.virtualbox.org/ticket/5293
VirtualBox is very consistently using 50% of a multi-core host's CPU time when the guest is running very CPU-intensive processes simultaneously. Is it possible that some VM option is preventing it from using more than one core?
https://www.virtualbox.org/ticket/13024
As up to 4.3.10 version, VirtualBox engine only support multiCPU configurations, where guest sees multiple CPU's as one physical CPU, with more cores and siblings. For majority of use-cases this is sufficiant to emulate multi-cpu environment.
https://docs.oracle.com/cd/F22853_01/F22854/html/guestossupport.html
Oracle VM VirtualBox 3.2 added experimental support for Mac OS X guests, with restrictions. See Section 3.1.1, “Mac OS X Guests” and ... As a result, if your Intel CPU is newer than the Mac OS X build, or if you have a non-Intel CPU, you will likely encounter a panic during bootup with an "Unsupported CPU" exception. ...
https://www.virtualbox.org/
VirtualBox is being actively developed with frequent releases and has an ever growing list of features, supported guest operating systems and platforms it runs on. VirtualBox is a community effort backed by a dedicated company: everyone is encouraged to contribute while Oracle ensures the product always meets professional quality criteria. ...
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