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We're currently in the process of testing all three releases, but we wanted to get some results to you as quickly as we could, so we concentrated efforts on the original GTA4 - and the results are fascinating. There's no doubt that frame-rates are improved over original hardware, and in many other back-compat titles, that's a very good thing. Red Dead Redemption and Undead Nightmare offer up a tangibly improved experience on Xbox One, after all. GTA4, however? We're not so sure.
The key difference here is that the original game operates with an unlocked frame-rate, running above and indeed below the console-standard 30fps. New frames are delivered somewhat unevenly as a result, usually at 16ms and 33ms periods when the game is running well. On paper, Xbox One looks good. It hits the same performance level as original hardware, but can actually deliver anything up to a 5fps advantage. In terms of the quality of Microsoft's virtual machine, this is impressive - GTA4 hits CPU hard, in particular.
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