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Question: questions upgrading and connecting through dish network

I have had the VGX-TP25e for more than a year now. My question is can i upgrade the ram? What is the clock on the bus? Does the optical out sync with the HDMI and is it 5 channel or 2? Onen last problem. I am connected to Dish networks Vip 622 dvr. the dual cablecard recievers will not connect even with a duplexer; at least the remote will not. without the remote, I cannot control the tv. This has caused some serious problems; cable tuners still in box, but cost $1,500. What options do I have for better connectivity?