If you have your 6000 set to output 1080i, then YES, it will convert a 720p signal to 1080i.
The next question is harder, but the academic answer is that some degradation must occur. There is going to be some spatial aliasing, and some temporal distortion. Can your monitor even resolve 1080x1920? Probably not, so the spatial part may not be discernable, depending on how good the 6000 performs anti-aliasing. The temporal part probably will be noticeable in rapid motion scenes, but this effect will depend on how the source material was recorded (i.e. was it native progressive video, or 24p film, etc.?)
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