CASIO fx-991CW

[ThomasK]

Got a Casio fx-991DE CW today, for 10.99€ (German "Mediamarkt" store)!
Not sure if that price was an error, "sold out" a few hours later.

Tried summation benchmark first:
max = 10000
~ 598.5s - casio fx-991DE CW, 13955.8579 (sum function)
max = 1000
~ 60.8s - casio fx-991DE CW, 1395.346288 (sum function)
max = 100
~ 6.8s - casio fx-991DE CW, 139.297187 (sum function)

A little slower than fx-991CW or may be not all calculators have exactly the same speed.
This calculator is light as a feather - is there anything inside? ;-)