fx-9750giii vs fx-CG50
03-08-2021, 03:05 AM
Post: #1
 lrdheat Senior Member Posts: 608 Joined: Feb 2014
fx-9750giii vs fx-CG50
Both calculators behave in a similar fashion. The 9750giii seems about 60% as fast as the CG50, a whole lot faster than the 991EX. The 9750giii is the first graphic calculator that fits in my shirt pocket. The CG50 has much higher resolution on it’s graph function, and offers a pleasing labeled graph paper-like function graph. The SolveN function is not as forgiving on the 9750giii as the CG50 when it comes to selecting a domain to search for a solution set. On the CG50 when looking for solutions for d/dx (e^(10*ABS(x-2)-x^2)=0 in the Run-Mat mode, it finds both -5 and 5 for a domain of -10 to 10. The fx-9750giii finds no solution with that domain, but if I use a smaller domain around each possible solution as found in the table function, it comes up with a correct solution (I tried -5.3 to -4.7, for example). Of course, using G-solve on the graph is easiest. I like how a function placed in the graphing environment can be found in the VAR key, and referred to elsewhere in the calculator without having to rewrite the function. The graphic options do not offer to integrate from one root to another, or intersection point as on the CG50, but it is easy to go back to Run-Mat, enter “x”, and save the result to a memory to use back in the graphic mode for such calculations. Nice machine! Office Depot was selling it for $65, but honored the$38 price shown on the Walmart site!
03-08-2021, 05:14 AM (This post was last modified: 03-08-2021 05:17 AM by Steve Simpkin.)
Post: #2
 Steve Simpkin Senior Member Posts: 563 Joined: Dec 2013
RE: fx-9750giii vs fx-CG50
It should also be noted that KhiCAS is now available on the Casio Fx-9750GIII (thank you Bernard!) giving it a CAS that is similar to the one in the HP Prime (same Xcas engine). This makes the Casio Fx-9750GIII the lowest priced currently produced graphing calculator in the U.S. with Python and CAS capabilities. Very impressive for under US$40 new. https://www.cemetech.net/forum/viewtopic...783#286192 03-09-2021, 12:25 AM Post: #3  lrdheat Senior Member Posts: 608 Joined: Feb 2014 RE: fx-9750giii vs fx-CG50 ...checking the 9750giii some more vs the CG50, using SolveN on d/dx(cos x/(2+sin x) for a 1 to 7 range on the CG50 brings up a solution of 7pi/6. Regardless of how tight a domain I try on the 9750giii, I cannot get it to find a solution. Solve (as opposed to SolveN) does find a solution on the 9750giii over a wide domain (1 to 7) in a decimal approximation. I wonder what causes the different behavior. 03-09-2021, 06:27 PM Post: #4  celltx Junior Member Posts: 22 Joined: Sep 2018 RE: fx-9750giii vs fx-CG50 The fx-9750giii advantage over CG-50 is that the results of the calculations can be easily copied to the entry line by just highlighting them and pressing "EXE". This is similar to HP Prime and TI calculators. Unfortunately, CG-50 does not support that. 03-09-2021, 09:21 PM (This post was last modified: 03-09-2021 09:21 PM by ijabbott.) Post: #5  ijabbott Senior Member Posts: 962 Joined: Jul 2015 RE: fx-9750giii vs fx-CG50 (03-09-2021 06:27 PM)celltx Wrote: The fx-9750giii advantage over CG-50 is that the results of the calculations can be easily copied to the entry line by just highlighting them and pressing "EXE". This is similar to HP Prime and TI calculators. Unfortunately, CG-50 does not support that. That is one of the most annoying things about the CG50. I didn't know the (updated) earlier models supported it. (I assume the 9xx0gII models support it the same as the 9xx0gIII models?) — Ian Abbott 03-09-2021, 09:47 PM Post: #6  lrdheat Senior Member Posts: 608 Joined: Feb 2014 RE: fx-9750giii vs fx-CG50 Thanks for this tip! 03-10-2021, 06:21 PM Post: #7  celltx Junior Member Posts: 22 Joined: Sep 2018 RE: fx-9750giii vs fx-CG50 Another fx-9750giii advantage is a much better key debouncing. Every keypress registers and does not create double or triple replicas. Unfortunately, CG-50 keys are less reliable. 03-11-2021, 07:11 AM Post: #8  toml_12953 Senior Member Posts: 1,646 Joined: Dec 2013 RE: fx-9750giii vs fx-CG50 (03-10-2021 06:21 PM)celltx Wrote: Another fx-9750giii advantage is a much better key debouncing. Every keypress registers and does not create double or triple replicas. Unfortunately, CG-50 keys are less reliable. I have a CG-50 and have no problem with the keys at all. Casio quality is variable, I guess. Tom L Cui bono? 03-11-2021, 10:33 AM Post: #9  celltx Junior Member Posts: 22 Joined: Sep 2018 RE: fx-9750giii vs fx-CG50 (03-11-2021 07:11 AM)toml_12953 Wrote: I have a CG-50 and have no problem with the keys at all. Casio quality is variable, I guess. Interesting. I have two CG-50 - one made in China, another one - in Thailand. Both have key debouncing issues. Not something dramatic, but quite noticeable. fx-9750giii keys are much better in that respect. 03-11-2021, 05:35 PM Post: #10  Dave Britten Senior Member Posts: 1,833 Joined: Dec 2013 RE: fx-9750giii vs fx-CG50 (03-11-2021 10:33 AM)celltx Wrote: (03-11-2021 07:11 AM)toml_12953 Wrote: I have a CG-50 and have no problem with the keys at all. Casio quality is variable, I guess. Interesting. I have two CG-50 - one made in China, another one - in Thailand. Both have key debouncing issues. Not something dramatic, but quite noticeable. fx-9750giii keys are much better in that respect. I haven't noticed any bounce issues on my fx-CG50, but the keys definitely require a more deliberate press to register, especially compared to the wonderful keys on the fx-9860G Slim. The arrow keys are particularly fussy. The fx-9750GIII is quite a bit better than the fx-CG50 in that regard. But the fx-CG50 certainly isn't so bad as to be unpleasant to use, it's just a noticeable difference. 03-14-2021, 04:24 PM Post: #11  Eddie W. Shore Senior Member Posts: 1,195 Joined: Dec 2013 RE: fx-9750giii vs fx-CG50 (03-11-2021 05:35 PM)Dave Britten Wrote: (03-11-2021 10:33 AM)celltx Wrote: Interesting. I have two CG-50 - one made in China, another one - in Thailand. Both have key debouncing issues. Not something dramatic, but quite noticeable. fx-9750giii keys are much better in that respect. I haven't noticed any bounce issues on my fx-CG50, but the keys definitely require a more deliberate press to register, especially compared to the wonderful keys on the fx-9860G Slim. The arrow keys are particularly fussy. The fx-9750GIII is quite a bit better than the fx-CG50 in that regard. But the fx-CG50 certainly isn't so bad as to be unpleasant to use, it's just a noticeable difference. I concur about the keyboards. For a while I heard a snap pressing the minus key on the CG50 because it was a little hard to press compared to the rest of the keys. Thankfully the key settled down. 03-14-2021, 04:25 PM (This post was last modified: 03-14-2021 04:30 PM by Eddie W. Shore.) Post: #12  Eddie W. Shore Senior Member Posts: 1,195 Joined: Dec 2013 RE: fx-9750giii vs fx-CG50 (03-08-2021 03:05 AM)lrdheat Wrote: Both calculators behave in a similar fashion. The 9750giii seems about 60% as fast as the CG50, a whole lot faster than the 991EX. The 9750giii is the first graphic calculator that fits in my shirt pocket. The CG50 has much higher resolution on it’s graph function, and offers a pleasing labeled graph paper-like function graph. The SolveN function is not as forgiving on the 9750giii as the CG50 when it comes to selecting a domain to search for a solution set. On the CG50 when looking for solutions for d/dx (e^(10*ABS(x-2)-x^2)=0 in the Run-Mat mode, it finds both -5 and 5 for a domain of -10 to 10. The fx-9750giii finds no solution with that domain, but if I use a smaller domain around each possible solution as found in the table function, it comes up with a correct solution (I tried -5.3 to -4.7, for example). Of course, using G-solve on the graph is easiest. I like how a function placed in the graphing environment can be found in the VAR key, and referred to elsewhere in the calculator without having to rewrite the function. The graphic options do not offer to integrate from one root to another, or intersection point as on the CG50, but it is easy to go back to Run-Mat, enter “x”, and save the result to a memory to use back in the graphic mode for such calculations. Nice machine! Office Depot was selling it for$65, but honored the \$38 price shown on the Walmart site!

I have a black fx-9750giii and tempted to get a white 9750giii, especially at that price. I wish Casio made a blue 9750giii, like they had with the 7400gii/7400giii, as blue is my favorite color. The 9750giii does almost everything the CG50 does, just with a monochrome screen instead of a color, backlit one. The 9750giii also lacks 3D graphing and geometry mode.
03-14-2021, 05:07 PM
Post: #13
 Dave Britten Senior Member Posts: 1,833 Joined: Dec 2013
RE: fx-9750giii vs fx-CG50
(03-14-2021 04:25 PM)Eddie W. Shore Wrote:  I have a black fx-9750giii and tempted to get a white 9750giii, especially at that price. I wish Casio made a blue 9750giii, like they had with the 7400gii/7400giii, as blue is my favorite color. The 9750giii does almost everything the CG50 does, just with a monochrome screen instead of a color, backlit one. The 9750giii also lacks 3D graphing and geometry mode.

You can get the Geometry add-in from Casio's download site, as well as Physium if you need a bare-bones periodic table.
03-16-2021, 12:25 AM (This post was last modified: 03-16-2021 12:33 AM by ijabbott.)
Post: #14
 ijabbott Senior Member Posts: 962 Joined: Jul 2015
RE: fx-9750giii vs fx-CG50
(03-14-2021 04:25 PM)Eddie W. Shore Wrote:  I have a black fx-9750giii and tempted to get a white 9750giii, especially at that price. I wish Casio made a blue 9750giii, like they had with the 7400gii/7400giii, as blue is my favorite color. The 9750giii does almost everything the CG50 does, just with a monochrome screen instead of a color, backlit one. The 9750giii also lacks 3D graphing and geometry mode.

The screen is also lower resolution than the Prizm series, 128x64 compared to the Prizm's 384x216 (not including the border).

Actually, there is a blue one if you count the French version of the 9750GIII/9860GIII, namely the Graph 35+E II. Well, the back of the calculator is blue, and the front is white with blue trim.

— Ian Abbott
03-16-2021, 03:49 AM
Post: #15
 lrdheat Senior Member Posts: 608 Joined: Feb 2014
RE: fx-9750giii vs fx-CG50
Due to the lack of a backlit screen, the 9750 giii is listed at ~240 hours on batteries vs ~100 hours on the fx-CG50.

I do wish that the data such as trace, roots, extremums were shown below the graphing screen. To avoid this, I set a window setting for the y axis such that the curser on an extremum especially, will not lie on top of the data (x,y value).

The CG50 does that nicely.
03-16-2021, 02:03 PM
Post: #16
 Hlib Member Posts: 221 Joined: Jan 2015
RE: fx-9750giii vs fx-CG50
It is surprising that CASIO from time to time churns out new modifications completely out of line with the obvious needs of users. What would be wrong with 9860Gslim on a new processor? What`s wrong with the GII-2 series with a backlit display? All this confusion with the characteristics and names makes me uneasy.
03-24-2021, 01:26 AM (This post was last modified: 03-24-2021 01:32 AM by Mjim.)
Post: #17
 Mjim Junior Member Posts: 37 Joined: Nov 2019
RE: fx-9750giii vs fx-CG50
I don't have the fx-9750GIII so being able to copy the answer to the current line is something I would love to have. Does it work like the TI where you can copy them to any point of an equation you are building, or does it only copy the value to current line and erase all progress?

Concur with the keyboard issue on my fx-CG50; especially when hitting off center with the keys, as I have had double presses or missed presses. I haven't used it as much as my other calculators, so it does sound promising that it may settle down like Eddie's did if I use it more.

Physium is good for the constants (a shame you can't access these directly from RUN-MATRIX mode however), but the periodic table is pretty much useless. ChemTable for my old palm pilot is only 61kB and contains far more useful information on each of the elements.

Also agree with Hlib on the removal of the clamshell 9860G from their product lineup and the backlight on the GIII. Then again they removed the SD card slot version of the fx-9860GII from their product lineup.
03-24-2021, 04:01 AM
Post: #18
 Steve Simpkin Senior Member Posts: 563 Joined: Dec 2013
RE: fx-9750giii vs fx-CG50
(03-24-2021 01:26 AM)Mjim Wrote:  ...
Concur with the keyboard issue on my fx-CG50; especially when hitting off center with the keys, as I have had double presses or missed presses. I haven't used it as much as my other calculators, so it does sound promising that it may settle down like Eddie's did if I use it more.
....
Also agree with Hlib on the removal of the clamshell 9860G from their product lineup and the backlight on the GIII. Then again they removed the SD card slot version of the fx-9860GII from their product lineup.

I haven't noticed any issues with my CG50 and hope they don't show up later.

I suspect Casio decides what various models to make based on the different requirements of the countries and schools that make up the education market since that is the only real market left. Blame them for their often arbitrary and opposing requirements not Casio. While you or I would likely buy one of their innovative past models, we are an insignificant market for the bean counters that probably have a large part in the decision on what functions go into the models they produce. An SD card? Schools will likely nix that idea right away as a mass storage device for cheating. They probably see potential cheats everywhere where they look. When you are a hammer, everything looks like a nail.
03-26-2021, 02:26 PM
Post: #19
 celltx Junior Member Posts: 22 Joined: Sep 2018
RE: fx-9750giii vs fx-CG50
(03-24-2021 01:26 AM)Mjim Wrote:  I don't have the fx-9750GIII so being able to copy the answer to the current line is something I would love to have. Does it work like the TI where you can copy them to any point of an equation you are building, or does it only copy the value to current line and erase all progress?

Copying results (values) is similar to TI and HP. Copying the expressions works just like on CG50 with clip-paste button combo.
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