You usually need to enable VT-x/AMD-v in the host PC BIOS.The CPU must be 64bit and support either Intel or AMD virtualization technologies: VT-x or AMD-v. Note your exact CPU model or part number, then go online and check its capabilities.To ensure that you can still run VMs in those categories, run through the following checklist :. The developers clearly feel that supporting older machines that don't have this hardware feature is no longer justified commercially. Starting with VirtualBox 6.1.0 the latter is now true for all other hosts. MacOS hosts require VT-x/AMD-v for every VM. This includes all 64bit VMs, and all VMs which use >1 CPU core. VirtualBox requires hardware support for virtualization (Intel VT-x or AMD-v) in order to run certain categories of VM. The original text remains below, the "bittedness" stuff is now less relevant, but the underlying problem and solutions have not changed. However VirtualBox 6.1.x now requires VT-x/AMD-v to be available (or Windows NEM, but we'll leave that for now) for all VMs, whether 32bit, 64bit, single or multiple vCPU and so on. If the topic had been called "VT-x not available error" then newbies may not have understood the relevance. This topic has the name it has because that was how most users encountered the problem of VT-x/AMD-v hardware accelerated virtualization not being available.
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