kritisharma :
I personally think that with i3 you cannot run software like AutoCAD smoothly. My personal recommendation is to use at least i5 for these types of software
I'd be interested in your thinking in which an 8th gen i3, which is FINALLY a true quad core like the i5 was, wouldn't be able to perform the same work, that the i5 has been recommended as an entry level chip for, in these kinds of work loads.
The new i3 might not have as much L3 cache as the i5, but the 4 cores and high clock speeds make it just as capable as older i5s. There is no reason an 8th gen i3 can't be the entry level suggestion. Sure, the 8400 would do better with its two more cores, but it also costs a significant amount more than an 8100.