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If you search for the word "convert" in the manuals for both of these receivers you'll see that both perform conversion of analog video signals to digital video (HDMI). This allows you to input different types of video sources (analog and HDMI) but to output all of them to the tv using a single HDMI cable. Both receivers also provide for A/V to a second zone.

Neither receiver scales up the resolution of the analog video signal when converting to HDMI (at this price, your TV does a better job of this anyway) and each uses its own proprietary speaker calibration algorithm. Both receivers decode DD TrueHD and DTS-MA lossless bitstreams from a Bluray player, although that doesn't matter to you now because your PS3 only sends the lossless PCM signals (identical result from the speakers).

Some differences are:

HDMI inputs: 919 = 4, 663 = 2

component video inputs: 919 = 2, 663 = 3

s-video inputs: 919 = 0, 663 = 5 (important if you have an s-video source)

preout connectors: 919 = 1 (subwoofer), 663 (7.2 channels, useful for connecting to separate AMP)

Your call. Good luck.
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