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The following are specifications to consider before downloading UTAU.

Minimum System Requirements

Operating System: Windows 2000
CPU: Intel Celeron Class CPU, 2 GHz and above. (tested)
Soundcard: Any
Disk Space: At least 100 MB

Recommended System Requirements

Operating System: Windows XP Professional SP2 and above. (Vista, 7, 8 and later)
CPU: At least 2 GHz; Intel Core CPU (Duo, Quad or i5 and better), AMD (Sempron, Athlon, Opteron, Phenom) or better. Multicore preferred.
RAM: 1 GB RAM or more. 2 GB results in faster rendering in addition to better CPU.
Soundcard: Any high-definition soundcard.
Disk Space: Anything above 200 MB; expect your disk requirement to rise as you get more voicebanks.

UTAU should be able to run in any system emulation environments such as virtual machines, though this has not been extensively tested.

A guide on how to run UTAU in Linux can be found here.

It can run in Macs via Apple BootCamp. This has been tested and it works fine; however, there may be a problem when applying the English patch. It works in VirtualBox and VMware Fusion.

It is able to run in any 32 or 64-bit OSes, such as Windows XP, Windows Vista, Windows 7 and Windows 8.

Other Required Software

You will need to download Visual Basic 6 runtimes if you are unable to run UTAU. You may also need to set your System Locale to Japanese if you are planning to use Kana-based Japanese voicebanks. (Windows XP and 2000 only; Vista and 7 has built-in provisions for such.) Or, you might also need Japanese Language Support or Microsoft AppLocale.