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The problem is, I just tested it vs my Extreme IV 8GB card. It is slower in every test. Needless to say I will be contacting sandisk regarding this to check if 1. if it is real, 2. if it is a bad copy or something, as the performance is nothing like it should be. On my 7D the max burst for raw files is 28 over 5 seconds (I ran the test several times). With the Extreme IV I get 31.
Usually one test the burst rate by taking as many shots as you can before you can hear a small “break”. According to:
http://www.digitalcamerareview.com/default.asp?newsID=4169&p=2 (and other sources) the rate should not change between a 300x and a 600x card, yet the time needed to restore the buffer should be lower.