Need help with MSIZ170-M5, not working with three on-board 1080Tis

[U253]

hi, guys

I am wondering whether anyone got similar issue before.

I have got MSI-Z170-M5, paired with G4400, as recommended by some bros here (saying working fine with 7 X 1080). I was playing it with two on-board 1070 very well. Now I have got a few 1080Tis, and risers are on the way. I tried to plugin 3 X 1080 Tis on board but only got two recognized no matter what I did. Then I replaced one 1080 Ti with 1080, and it's working. Really don't understand the difference between 3 X 1080 Tis vs 2 X 1080 Tis + 1 X 1070. Note that all my 1080 Tis should be ok as I have four on hands and already tested different combos.

any feedback is really appreciated.
 

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[Elder III]

My first thought is that perhaps the greater tdp of the 1080 Ti might be preventing the motherboard from running 3 of them when plugged directly into it.  If it works when your risers arrive then that would prove that possible theory.

Is it this motherboard that you have?

https://www.newegg.com/Product/Product.aspx?Item=N82E16813130873

[U253]

My first thought is that perhaps the greater tdp of the 1080 Ti might be preventing the motherboard from running 3 of them when plugged directly into it.  If it works when your risers arrive then that would prove that possible theory.

Is it this motherboard that you have?

https://www.newegg.com/Product/Product.aspx?Item=N82E16813130873

thanks a lot for your kind feedback. I will definitely try a riser later on. Yes I have this board (MSI-Z170-M5), while some one here earlier confirmed it's working with 7 X 1080, but that should be with risers.

warm regards