Ambitious forthcoming games-on-demand service OnLive has opened its best test, inviting American users to sign up and put it to the test.

The OnLive founder Steve Perlman said one of the main benefits of using the service will be that aims to offer consistently high quality access to a wide range of broadband speeds on PC and Mac.

Due to launch later this year, those who are interested in testing out the service will need to enter specific information about their computer set-up.

"Beta is an awesome milestone for OnLive, capping many years of work. We’re really looking forward to hearing what you think," staes CEO Steve Perlman.

The service aims to allow consumers signed up to a monthly subscription to stream games directly to their computer or TV with no large files or discs.