After obtaining advice from Bob, I recently purchased an HPE-180t with the following customization: i7-930 CPU, NVIDIA GeForce GTX 260 CPU and 8GB DDR3-1066MHz SDRAM [4 DIMMs]. Although I have been happy with the machine in my signature for editing with PRE7, the bottleneck in the creation process has been the encoding of the HD MPEG2 1920 x 1080 30 files that I use both for playback on my 52-inch HDTV and for burning Blu-ray disks. So I bought the HP with the intention of using it exclusively for encoding my PRE7 PREL files, which frees up the machine in my signature for beginning the editing of a new project.
But this evening, out of curiosity, I tried for the first time to edit with PRE7 a new project using the new HP. To my surprise, I discovered that not only can I edit with PRE7 on my 52-inch Samsung but also I can play back the unrendered PREL file in Full Screen Mode extemely smoothly. This a tremendous time saver as I no longer need to render the project for smooth playback so I can check for flaws prior to burning the MPEG2 file.
My connections are as follow: the video is output from the HPE-180t via HDMI to the HDMI In on my home theater, which is in turn connected via HDMI to the HDTV; the audio is output from the Optical Audio Out on the machine to the Optical Audio In on the home theater. The audio is then fed by the home theater to its 7.1 speaker system, so I am getting 8 channels of sound from the audio in WAV format that I use for all my projects.
Bob, I can't thank you enough for so generously sharing your expertise.