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Hi all!
To my surprise I found that the HP-48GX is almost 8 times as fast as the much newer HP-49G. Can anyone confirm this?
Also, I've heard about a "speed module" for the HP-49G. Does this really exist and how much performance can be gained?
Thanks, Tony

I do not believe the 48 is even in the same league as the 49G, and for most applications the speed issue is reversed. The 49G is much faster for 90% of most tasks.

That said however, I do believe there are certain areas where the 48 is faster (numerical results where flags on the 49 will conflict and cause longer solve times). This is very common.

If you configure the 49 properly (and that is a science in itself) you will get better results.

Still I will agree that I do like my 48 better than my 49, due to the keyboard feel and the Enter key location.


you can get HP48G- as well as HP49G machines with internal speed modules at German company Dynatech (www.dynatech.com, I think). You may also consider to send in your "ordinary" (can an HP48/49G be called ordinary at all?) machine and get the module built into it (that, of course, would save you a lot of money compared with purchasing an overclocked machine). But be warned: With accelerated machines, the clock and thus the time and date functions are disabled!


I bet you tried with a loop indexed by an integer number: 49G defaults to long integers. Much more precision but slower and more memory hungry.

If so, try adding a dot (or comma based on your settings) after the index range (i.e. 1 10 FOR ... -> 1. 10. FOR ...)


Hi Massimo!
Many thanks a lot for pointing this out! Indeed, after adding decimal points to my integer numbers execution sped up by a factor of 10!
Couldn't believe that the HP-49G would be so slow all along...

Hello Tony!

Glad this helped pointing out one of the differences between the two calcs.

Indeed I too was amazed at first when trying the "empty loop test" on both...
At least this is one of the FAQs about 49G and the solution is quite simple :)


More infos and comparisons between the HP-48 and the 49G are available on www.hpcalc.org