Whoa, not so fast - you might want to reconsider your choice.
Here's my understanding of what it means to be an "Avid qualified" machine... Take a look at the current list:
At the very bottom of this Avid list you'll see that the Dell M4600 is "qualified" for MC 8.3, with no limitations. This is 4-year-old laptop running an Intel quad-core i7 (with hyperthreading) at 2.2 Ghz. (BTW, I use one of these old warhorses as my personal carry-around Avid and it works just fine at DNxHD resolutions.)
And at the very top of this Avid list you'll see that the HP Z840 is "qualified" but only if it has dual 8, 10, or 12 core Xeon processors. However, HP now lists 19 processors as options for the Z840 from a 6-core single-threaded Xeon, to an 18-core hyperthreaded Xeon.
Avid engineering doesn't have the time to test every possible option of every make & model of computer; they have to limit their "qualification" to a selection of machines they deem most useful for their predicted market. The fact that for the Z840 they have only tested a few of the Xeons, and only in dual-processor rigs, doesn't mean that no other configurations work.
In fact, I'll bet that lots of other "not qualified" configurations will work just fine, or even better. If a dual 8-core is "qualified" I'll wager that the single 18-core works too. But a single 18-core costs more than even dual 12-cores, so there's not gonna be much demand from Avid users for that configuration, and Avid isn't gonna test it so it'll never get "qualified."
If a Z840 is your preferred machine, sure, go ahead & buy it, but feel free to choose whatever processor(s) make sense for the work you're going to do. You can always upgrade processors later.
Disclaimer: I don't speak for Avid; I'm just an end-user making television. YMMV.
