Does a 1066x CF card have speed difference to a 800x on a 5D Mark II?

Does a 1066x CF card have speed difference to a 800x on a 5D Mark II? Is there a limiting factor that I should have in mind in order to avoid unecessary expenses?
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Sorry, I missed that in your first post. Here is the data for the 5D Mk II: http://www.robgalbraith.com/camera_wb_multi_paged527.html?cid=6007-9784
(the drop down menu at the top lets you choose from many different cameras)
With a 400x 60MB/s card the write speeds max out at about 30MB/s.
With a 1000x 150MB/s card the write speeds max out at about 50MB/s.
Mike Sowsun
S110, SL1, 5D Mk III

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Hi,
text 3 thru 14 in largeText
character 3 thru 14 in largeText
text 3 in largeText
character 3 in largeText
These lines will be slow on Leopard
Getting some text in a variable that contains more than 60000 characters will be slower on Leopard,
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script o
    property t_text : ""
end script
set a to "abcdefghij"
set tResult to ""
repeat with i from 1 to 3
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tResult
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Getting text in the variable which contains 1310720 characters, (20 times) = 50 seconds.
Getting text in the variable which contains   327680 characters, (20 times) = 12 seconds.
Getting text in the variable which contains   163840 characters, (20 times) =   6 seconds.
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script o
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end findAll
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beep
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