Netflix is bumping up the quality of many of its instant streaming titles to what it calls Super HD, but you won’t be able to enjoy it unless you are with one of two U.S. Internet service providers.

Super HD is basically Netflix’s branding for 1080p full HD content. It requires at least 5Mb/s download speeds, or 7Mb/s for the highest available video quality. It works with Netflix on PlayStation 3, Nintendo’s Wii U, Windows 8, Roku, Apple TVs with 1080p, and certain smart TVs and Blu-Ray players.

The big caveat with Netflix Super HD is that in the U.S., you will only be able to enjoy full HD streaming if you are with Cablevision or Google Fiber. The two providers are part of Netflix Open Connect, a content delivery network meant to improve video streaming from the service. No other U.S. provider is currently part of it.

Outside the U.S., Netflix Super HD will also be available in the U.K. from most major providers, including Virgin Media and British Telecom, and globally from the likes of Telmex, Telus, TDC and GVT, totaling more than 25 million streaming subscribers.

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