Morphevz
@devsfan1830; I'm not sure if your doubt is if the gsync + non-gsync are compatible to work within a OS environment, or if you plan to dual screen games with it.
 
If your concern is if they'll be compatible for desktop use, I can confirm (as Eddie mentioned) that it won't be a problem. I have a multimonitor setup with the Asus ROG Swift as my main screen, and a 1080p Benq on the side, with then my 55" TV connected as well. I never had any issues either on desktop use or single screen gaming. But I can't recall having tried "stereo monitor" with it since the Switf has a different resolution than the other two.

matthewdg1973
I currently have 2 Benq XL2420Z's and I am very pleased with them. If you decide to get one of these get it from either Newegg or Amazon. That way you are sure to get one that has version 2 firmware installed. With a little bit of tweaking they are amazing. Games look like they are running on a CRT monitor (smoothness, vertically no blur). This site is a good resource as well if you decide to go this route: www.blurbusters.com

matthewdg1973

devsfan1830

matthewdg1973
I currently have 2 Benq XL2420Z's and I am very pleased with them. If you decide to get one of these get it from either Newegg or Amazon. That way you are sure to get one that has version 2 firmware installed. With a little bit of tweaking they are amazing. Games look like they are running on a CRT monitor (smoothness, vertically no blur). This site is a good resource as well if you decide to go this route: www.blurbusters.com

Yeah i see that all over the place, but i dont see what difference that makes. it seems like all that does is make it play nice with a benchmark tool. plus if im using gsync on my primary then that does nothing for me and gsync is its own scaler. benq doesnt do firmware for that module, its nvidias.

I was speaking solely of the BenQ XL2420Z not Nvidia's G-Sync concerning the firmware version. I'm not sure what you mean by benchmark tool. The utility on the Blurbusters site helps to reduce or nearly eliminate blurring associated with LCD monitors. And it works. If you like G-Sync, by all means go for it, I was just giving a option to think about. The Benq's are great. I don't have any tearing, motion blur while gaming. Maybe I just read your post wrong.

devsfan1830
With the benq 2420G/Z, does it have a display port cable in the box? How long is it?

EVGATech_EddieH
Hello devsfan1830,
 
It just so happens that I do run a dual monitor set up like the one you looking at myself.  I have a GTX 780 Classified, on a Z77 motherboard with a 3770K clocked at 4.2 with 8GBs of DDR3 1600.  The monitors are both 27 inches displays, my secondary one is a standard 1920x1080 @ 60HZ nothing fancy.  My main is a Acer XB270H 144Hz @ 1920x1080 thats G-Sync and 3D ready.
 
The primary Acer monitor;  is for lack of better word, awesome!  Right off the bat when it was set up, I put it at 144Hz, which did give a warning for games, which need to be played at full screen to take advantage of G-Sync.  No issues with any type of stuttering, lag, crashes, or issues of any kind when playing games or movies.  All games that I've tried will stick at the 144hz mark with no problem. 
 
The secondary 1080P @ 60Hz monitor; was my primary bofore the Gsync one.  Never had any issues with it prior to adding the 2nd monitor.  But one thing I have noticed, is video quality stutters/waves/distorsions on it when I have a game running on the the Gsync monitor.  Since I will usually play a game at the same time have netflix or a movie playing on this 2nd monitor, it is very apparent.  If your just streaming music from pandora or spotify, on that 2nd monitor there are no issues, I've only really seen issues with movies.  Be it in full screen or windowed mode.
 
Though this is just my own experience and others may have no issues at all.  Now one thing to note, that my system is a Z77 running a 780.  These issues may not exsist if you are running a newer mb/processer with a 900 seires GPU.  I am in the process of upgrading to the X99 platform with a 980, and at that point will retest this and see if the troubles with the secondary monitor still exsist. 
 
Depening on your setup, the BenQ monitors you are looking at may or may not have any issues.  I would suggest checking out reviews on the Gsync monitor and checking out their forums.