Back in 1997 I used an HP Vectra tower with Pentium Pro, 32mb RAM, and SCSI harddrive. I ran WinNT 3.5.1
It was a pretty reliable workstation but I do remember it crashing and blue screen a few times.

In the educational classrooms we taught WinNT 4.0 Workstation and Server on Pentium 90 and 100mhz CPU.
We taught everything program you could think of.
These computers were pretty stable and reliable. They did not crash.
So these CPU’s were fast enough.

I would say as long as you put a good install on that computer it should be okay.
I don’t think the CPU should be a problem.
All you need is 16mb to 32mb of memory.
Increase your page file and virtual memory
Install the service packs and updates.

For me NT4 was the first to rip CD's and later DVD's! I used (still have) an Abit IT5H in the range of 233-292 with a Buslogic 932 and a 952 handling a few drives, external Pioneer changers and stuff. It started at 32MB and ended at 192 or something. Started with dual head Appian graphics and ended with some ATI. I ran Acad12 for DOS with the help of a pif and pharlap. It was a very productive machine at the time. I fired it up a few years back and cleaned up the 80 pin drives. It still worked.
I wasn't much of a gamer except for a few DOS games, mainly Descent. Sound was Ensoniq. I noticed on that last run that it is actually kinda noisy.