No. On the SA8300HD DVR you need to connect one or the other (component OR HDMI) not both, only one of those two HD outputs can be active.
However the fixed 480i outputs on RF, composite and s-video are output simultaneously with whichever single HD output you use. Useful for recording to VCRs or DVD recorders or also outputting to a SD TV or display, even in another room - particularly from the channel 3 RF output with a coax cable!
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