Please, how can I run 64-bit guests on a 32-bit host?

I have Oracle VM Virtualbox 4.3.12. When I choose: screenshot of the VirtualBox window to select guest machine type

I can only find 32-bit. My host CPU is Intel(R) Core(TM)2 Duo CPU T6600 @ 2.20GHz.

from cat /proc/cpuinfo processor:

flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 constant_tsc pni monitor ssse3 bogomips

  • Your screenshot is from Windows version of VirtualBox. Which makes your question off-topic.
    – Danatela
    Jun 2, 2014 at 10:13

2 Answers 2


Your CPU does not provide VT-x harware virtualization needed for running a 64-bit guest OS in a 32-bit host. There is nothing we can do to overcome this.

In order to still be able to run a 64-bit application (as was said in a comment) let me suggest you run Ubuntu 64-bit either by a dual-boot, or as a live system from USB. A live system in persistence mode allows to save files in a reserved area.

Alternatively it is also possible to completely install a bootable Ubuntu on a USB drive/key:

  • Ok,i will try this solution.. Please, where can i find unbutu 12 64bits intel ? i founded only AMD which is not compatible with my host! releases.ubuntu.com/12.04
    – researcher
    Jun 2, 2014 at 14:50
  • 1
    Intel 64-bit CPUs use AM64 architecture. That's the one you need.
    – Takkat
    Jun 2, 2014 at 16:06
  • ok i will try ubuntu-12.04.4-desktop-amd64.iso with USB.. Thanks a lot.
    – researcher
    Jun 2, 2014 at 16:08
  • Please i have a question, in my host i have windows 7 32bits, it's necessarly that the cpu is in 32 bits ? where can i find if my processor is 32bits or 64 bits ? Thanks a lot.
    – researcher
    Jun 5, 2014 at 10:02
  • it's 64-bit: ark.intel.com/products/37255/…
    – Takkat
    Jun 5, 2014 at 10:28

Support for 64-bit guests requires CPU virtualization support in the host, A.K.A. VT-x (or AMD-v). You need to verify that your CPU has this feature.

Navigate to BIOS and enable it if it’s supported by your CPU, try to google your CPU Specs.

Conditions for running 64-bit guests on 32-bit hosts:

VirtualBox supports 64-bit guest operating systems, even on 32-bit host operating systems, provided that the following conditions are met:

  • You need a 64-bit processor with hardware virtualization support (see Section 10.3, “Hardware vs. software virtualization”).

  • You must enable hardware virtualization for the particular VM for which you want 64-bit support; software virtualization is not supported for 64-bit VMs.

  • If you want to use 64-bit guest support on a 32-bit host operating system, you must also select a 64-bit operating system for the particular VM. Since supporting 64 bits on 32-bit hosts incurs additional overhead, VirtualBox only enables this support upon explicit request.

  • On 64-bit hosts (which typically come with hardware virtualization support), 64-bit guest operating systems are always supported regardless of settings, so you can simply install a 64-bit operating system in the guest.

  • Warning

    On any host, you should enable the I/O APIC for virtual machines that you intend to use in 64-bit mode. This is especially true for 64-bit Windows VMs. See Section 3.3.2, “"Advanced" tab”. In addition, for 64-bit Windows guests, you should make sure that the VM uses the Intel networking device, since there is no 64-bit driver support for the AMD PCNet card; see Section 6.1, “Virtual networking hardware”.

  • My CPU is: Intel(R) Core(TM)2 Duo CPU T6600 @ 2.20GHz
    – researcher
    Jun 2, 2014 at 9:54
  • thats not what you should know , you should see if it support VT-x or AMD -v
    – nux
    Jun 2, 2014 at 9:56
  • ark.intel.com/fr/products/37255/… Technologie de virtualisation Intel® (VT-x) ‡ No
    – researcher
    Jun 2, 2014 at 9:59
  • then you could not run 64 bit system
    – nux
    Jun 2, 2014 at 10:02
  • OK, i ask, please if there is x86-64 virtual machine , i said perharps, it works on my machine ? i'm really blocked because i have to work with a tool which run only on 64bit !!!
    – researcher
    Jun 2, 2014 at 10:06

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