We already knew that Home Box Office was champing at the bit to rid itself of anything less than pure, unadulterated (okay, maybe just a little bit) HD, and now the outfit is announcing that its Cinemax channel will be going 100% high-def on September 1st. Granted, we're talking about the main channel only here, but this fall / winter is shaping up to be a good one for Cinemax HD. Subscribers will see the pay-TV premieres of The Bourne Ultimatum, Rendition, The Assassination of Jesse James by the Coward Robert Ford and The Darjeeling Limited, and in the near future, viewers will see I Am Legend, Juno, Alien vs. Predator: Requiem and In The Valley of Elah. Of note, the release states that "true HD (1080i)" won't begin until September 6th -- odd, but we suppose a few extra days won't kill us. [Disclosure: Engadget is part of the Time Warner family]

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