Since the fx-9850gb plus (BE) became my first full-fledged graphical calculator from CASIO in 1998, I have been watching with interest the development of this (or like this) line for about 20 years.

For a more objective assessment of the speed of calculations, I took two different programs. The first of them is the well-known 8-queens benchmark. The code with the

**List**variable was selected as less effective for the fx-9750gii/9860gii.

0➝A~Z:8➝R R➝Dim List 1 Lbl 0:X=R⇒Goto 4 Isz X:R➝List 1[X] Lbl 1:Isz S:X➝Y Lbl 2:Dsz Y Deg Y=0⇒Goto 0 List 1[X]-List 1[Y]➝T T=0⇒Goto 3 X-Y≠Abs T⇒Goto 2 Lbl 3:List 1[X]-1➝List 1[X] List 1[X]⇒Goto 1 Dsz X:Goto 3 Lbl 4:SThe second one solves a fun problem: how many integers (from 1 to 9999) are evenly divisible by the number of letters in their name? First one is 4 (divisible by f-o-u-r (4 letters): 4÷4=1). Last one happens to be 9999 (divisible by n-i-n-e-t-h-o-u-s-a-n-d-n-i-n-e-h-u-n-d-r-e-d-n-i-n-e-t-y-n-i-n-e (33 letters): 9999÷33=303).

[[0,3,3,5,4,4,3,5,5,4] [3,6,6,8,8,7,7,9,8,8] [0,0,6,6,5,5,5,7,6,6]]→Mat K -1→N:0→K For 1→E To 10:Mat K[1,E]+8(E≠1)→S For 1→D To 10:Mat K[1,D]+7(D≠1)+S→T For 1→C To 10:Mat K[3,C]+T→U (C=2)+1→B For 1→A To 10:Mat K[B,A]+U→V N+1→N:V≠0⇒(Frac (N/V)=0)+K→K Next:Next:Next:Next:"K=":Kspoiler: K=359.

This code contains the operations

**For...Next**and

**Mat_**, which fx-9750gii/9860gii perform very quickly.

The results are shown in a table from my paper notebook. The measurement and rounding error does not exceed 2%.

When comparing the results obtained from 9750gii and 9860gii, an unexpected conclusion arises: the speed of the calculator is directly proportional to its power consumption. And if I didn`t know anything about their hardware stuffing, I would say based on these tests: the fx-9750gii is a 56 MHz overclocked fx-9860gii. No special technological advantages of the 9860gii calculator compared to the 9750gii have been observed. A similar proportionality between speed and power is seen when comparing results between fx-9750g plus and 9750gii/9860gii.

Probably, the CPU clock speed can not serve as a true characteristic of the calculator, since the manufacturer also regulates the speed in other ways.

And brief conclusions that I made for myself: 1) such a calculator as 9750g plus is still relevant today; 2) I will not upgrade the 9750gii. Even with the old OS 02.00, it is an excellent calculator; 3) there are no complaints about 9860gii.

**Edited by Hlib2, 20 June 2020 - 12:41 PM.**