Benchmark test e^x^3

[Beginner]

Some time ago I came across a youtube video in which as a benchmark test is suggested to calculate the intervall of e^x^3 between 0 and 6. The result is 5,96 E91. It takes about 1 second for the HP Prime, it takes more than 1 min for the HP 50G.

https://www.youtube.com/watch?v=DHRsvSTGiBc

I used this test for several other calculators (it takes about 4 seconds for the new Casio CG50 to accomplish this task, several smaller scientific calculators need more than 1 minute) and tried some variants for larger calculators:

It is possible to calculate the intervall of e^x^3 between 0 and 10,5 with the HP 50G (which takes several minutes but finally succeedes as expected, because the resultat is under E499 (2,22 E498).

I was astonished, that the HP Prime could calculate the intervall of e^x^3 only between 0 and 8,9 - the result being 6,14 E303. It should be able to do the same as the HP 50G because the limit is also E499. Why does it fail?

Does the second generation of HP Prime succeede?

The TI NSpire can calculate the intervall of e^x^3 between 0 and 13 (result: 2,75 E951) in about 2 sec. It's limit is E999.