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Relative Strength Index: Yahoo vs Google Finance
Google's RSI is using a 10 period on 2 minute bars - i.e. it is based upon the last 20 minutes of data. Yahoo's RSI is using a 14 period lookback on an undetermined timeframe (you could maybe mouse-over and see what incremental part of the chart is giving) and given the "choppier" price chart, probably 30 second or 1 minute bars.   Given the difference in both the period specified and the periodicity of the charts - you should expect different results.