Intel Motherboards - Z390 Pro4 5th GPU won't post

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Z390 Pro4 5th GPU won't post

Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=18933
Printed Date: 27 Jul 2025 at 12:39am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Z390 Pro4 5th GPU won't post

Posted By: Matsonbeast
Subject: Z390 Pro4 5th GPU won't post
Date Posted: 25 May 2021 at 7:20am

So.. After a couple of days of banging my head to the wall and now already given up so that I putted my 5th GPU for sale I decided to give it a one more try if I can get any help from here.

The problem is that when I'm adding 5th GPU in any way to my rig it won't post. No display and msOS gives only "undetected hardware" and won't show even the 4. I can't get any display.

Specs:

Asrock Z390 pro4
Intel i5-9400f
Kingston 250gb nvme m2
8gb ram
3x asus rtx 3070 dual
Inno3d RTX3060ti
PNY RTX3060ti
Corsair RM1000x
EVGA G3 850W

Tried basicly everything I could find from the wonder world of internet. Gen1, Gen 2, Above 4g decoding...

And the thing is that the problem occurs when using both PCI-E X16 slots. When using any combination of 1:s and 1 x16 it works like a miracle. I'm certain that there is some setting in BIOS that I just can't handle or find. Or to be honest, I have absolutely no idea.

Any ideas? Thank you in advance all!