Maybe you dont understand me right.
Revit can work with all configurations that have a minimal req ( click here ).
Ábout CPU frequency i'll avoid complicated conversations and fight for possitives and negatives. I was on negative side befor i get a boxx workstation. I have too hp z840 and i make my conclusions on real projects work. For me working on 3.5GHz CPU (2xE5-2637 in hp z840) vs working on 5.7GHz CPU i7 6700k (overclock in my i7 to 5.7GHz its extreamly high and req independence fluid cooling system. This overclock is not making by BOXX ) results are clear. Overclocked i7 works better and faster than dowble stock xeon when i create a model (Design MEP installations and architecture). When i go to render step than double xeon kicked out i7.
All depends on what do you need ! For what you use revit? What is your work flow and more and more factors.
Yes overlocking is risk but BOXX overclock is not extream. They have good air cooling with custom cases.
Here and here have some good old discussions about revit hardware.
My opinion is that overclocking of mid range workstation without xeon CPU are good way to raise your machine capability.
If your machine use xeon CPUs that is other discussion. I avoid overclocking my xeons. They are made to work non-stop and stable with shop configuration and overclocking may cause problems with overheating.
I'm agree with that BOXX are good for small count orders. Yes they are limited , they cant provide you lots of machines for small amount of time.
HP Dell and Lenovo are huge companies and they have amaizing products.
I'll say it again - all depends on personal needs !
Its not a advertisement of BOXX. I think that they products have good quality but for high price.
PP: I'm not a gamer and i'm not walking around with a measuring stick.
Eng. Iliev L. 



⁞|⁞ BIM Implementer, Project & BIM Manager, Coordinator, MEP Engineer
⁞|⁞ http://www.TechRoom.bg