Mobo for two 4k monitors

a generic motherboard won't support this what you need is a graphics adapter that supports what you want. 2 x GTX 980's will do it. (approx $1K) or 2 x GTX 970 (approx $700)

@David - see:

https://www.experts-exchange.com/questions/28938414/PC-build-question.html
https://www.experts-exchange.com/questions/28938414/PC-build-question.html

For previous history on this.

Intel's Iris/Iris Pro graphics will allow it on a suitably equipped motherboard without separate GFX boards - Thunderbolt ports are the limiting factor hence my earlier recommendation that wfcrr goes down a DisplayPort route as Iris supports 3 x UHD displays at 60Hz over DP/HDMI/DP (not for anything that is the least bit graphics intensive obviously!)

Another question is does your TV support 60hz refresh or 30hz refresh? Most 4K TV's only support 30hz refresh.

@David Johnson 3840 x 2160p frequencies 24 / 25 / 30 / 50 / 60Hz are listed on page 144 of the manual....however at this time the one TV I am running from my graphics card seems to be running at 30Hz, I assume due to the graphics card.

 @everyone else.  I had opened this new question because I was having so much trouble finding a  Thunderbolt 3 to Display Port adapter and then get that to go to HDMI port....where it would support 3840x2160@60Hz.  That was why I opened this question, assuming there would possibly be a mobo out there that would run 2 ports to HDMI at that res.

 I don't mean to bug you guys.  Is there a better way to search/source for this?

In my post, I gave you a link to the various HDMI specifications and told you you had to have HDMI 2.0 to get 60Hz.  Did you read it?
I also gave you a link to a Gigabyte Z170 system board that has HDMI 2.0; but, only Gigabyte can tell you if the display port will allow you to run a second display at the same resolution.  Did you try asking them?
I also said that just getting the wrong cable will knock your 60Hz out of the water even if both ends support it.

@Davis, thanks for the post. I had read the HDMI spec link and the Gigabyte mobo link and found it helpful.  I think I can feel my brain melt a little when I read some of this tech stuff...when I re-read the Gigabyte mobo specs again today, I realize that mobo will probably work.

@Masq, good point, I'll look at mobo's and with one HDMI and one DP port and see if that gets me there.  Thanks for sending the ASUS mobo link. I will look into that one as well.  I recently built an ASUS and it gave me a lot of trouble after installing the Win7Pro OS and drivers. Had to dink around with it. Seems like the Gigabyte mobo's I built in the past have been less trouble, driver-wise

I do have support questions posted with Gigabyte, waiting for responses from Gigabyte.

From the same page:
Expansion Options
PCI Express Revision       Gen2
PCIe Mini Card Slot (Half Length)       1
PCIe Mini Card Slot (Full Length)       1

You need to drill the case to get SATA ports out.

@gheist, thanks for the comment.  Does this apply to the question of getting two monitors to run at 3840x2160 60Hz using on the ports from the mobo, ie, not having to run from graphics cards?

Nope; not a thing....

Found a Club3D Display Port to HDMI 2.0 adapter that supports 3840x2160@60Hz and ordered it with a HDMI cable that is also 2.0 compliant and rated to support 3840x2160@60Hz.  Will be ordering a mobo this week and will see how it goes.  Thanks for all the input!

Active or passive DP/HDMI adapter?  If you have a choice I'd go active, a few extra $$ but more likely to give you the result you want.

I may have closed this question too soon? Here is the adapter I ordered...I think it's active:

http://www.club-3d.com/index.php/products/reader.en/product/displayport-12-to-hdmi-20-uhd-active-adapter.html

I just got off the phone with Gigabyte support and that left me a little puzzled.  The guy at Gigabyte said the limitation of 30Hz was governed by the mobo...then I told him I was using the core i7 6700 Skylake processor which supports 60Hz, then he said I would be able to run 60Hz, but he only thinks one port will do the 60Hz. I kind of got the impression he was not sure, though, as he kept saying it is based on the processor I use...

How do I nail this down, definitely?  Sales rep at Superbiiz, doesn't really know, and now that Gigabyte was a little fuzzy on it, leaves me wondering about  the two monitor question.

Wrong thread oops...

You're on the bleeding edge of current technology and I don't think you'll really know until you try it!
I'm also curious to know where you think you're going to find 4K to send to the monitors?  It won't be on blueray.

I think we're just looking at getting 2 x 3840x2160 of desktop real estate - the Iris chipset isn't going to be coping with rendering too!

Thank Davis and Masq, I just need it for space, not for intensive graphics. I have been using one 55" Samsung TV at 3840x2160 30Hz and four 24" monitors each at 1920x1080. The Samsung TV at that resolution is similar in sizing to the four 24" monitors. Now I want to replace the four 24" monitors with the second 55" TV.

Actually, I am getting ready to replace several employees computers and since most use 2-3 monitors, I am planning on building PC's that can output to HD TV's, instead.

The only noticeable difference I can see is the TV shows the colors slightly differently than the monitors.  I wonder if the 30Hz vs 60Hz will make much difference?