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Relative Strength Index: Yahoo vs Google Finance
Look at the 'as of'.  Google's as of is 11:27 whil Yahoo's is 11:19.  Given the shape of the Google curve, it looks to me that Yahoo's may well drop that much in the next 8 minutes. In fact, looking at it now, Yahoo's algorithm showed it as about 30 at 11:24, before going back up again some.  It may not have been identical to Google's, but it was certainly close.