PC satellite TV software generally costs less than $60 while PCTV cards at the stores can fall within the range of $100 to $300. One thing people complain when they watch satellite TV on PC is the size of the monitor screen. This is no fault of PC satellite TV but it can affect the viewing experience. You can always switch to a larger LCD monitor screen but it can cost you quite a fair bit. Another cheap method is to plug a video card with S-Video output that can be connected to your TV for viewing.
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Ideally you need at least 512 MB of memory to prevent 'lags' in the transmission of the video. Basically, the more memory you have to spare, the more 'wiggle room' can be allotted to the TV software application, which it uses to 'buffer' the video.