Z370 Extreme 4 - GFX card not running at 16x
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=8288
Printed Date: 29 Jan 2025 at 8:27am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z370 Extreme 4 - GFX card not running at 16x
Posted By: johnnyw
Subject: Z370 Extreme 4 - GFX card not running at 16x
Date Posted: 05 Apr 2018 at 3:27am
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" rel="nofollow - Build new computer today and having strange problem with it. On some reason my gfx card doesnt run at x16 on any PCI-E slot, on the main slot it runs only at x8 3.0, if i move it to the lower x16 slot it runs only at x4 3.0 speed. Any ideas, or could it be that motherboard is just faulty out of the box? Asrock Z370 Extreme 4 (latest p1.80 bios) Core i7 8700k 2x8GB Corsair LPX 3000mhz Asus GTX 1080 strix Samsung 850 EVO 250GB SSD Seagate 3Tb HDD Seasonic 660W XP2 PSU Windows 10 Pro 64bit |
Replies:
Posted By: Xaltar
Date Posted: 05 Apr 2018 at 4:06am
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With everything installed, clear CMOS, make sure the PC is powered off and the power switch on the PSU is off. While you have the case open, make sure the GPU is fully seated in the slot and not drooping at the unsupported end, this can cause the symptoms you describe. If you have a bit of droop, you can support the GPU with a box or other appropriate height object to test and see if you get the full x16 with it supported there. The GPU should be perfectly level with maybe an ever so slight upward pressure. Let us know if any of that resolves the issue for you. I suspect clearing CMOS should do the trick. Good luck and let us know how it goes. ------------- 
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Posted By: johnnyw
Date Posted: 05 Apr 2018 at 11:01am
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Hey. Clearing cmos was first thing i tried, also did reseat the card several times with no luck. There is something serisouly strange going on, yesterday when tried the lower x16 slot again latere card was running only at x2 3.0 speed, then put it back to the primary slot where it earlier worked x8, but now it was running only x4 3.0 on that aswell. After that cleared cmos and it got back to x8 3.0 on that primary slot. But on some reason it simply wont run at full x16 3.0 no matter that i do. Gfx card is not the culprit, it runs fine on my old cpu + motherboard combo. |
Posted By: wardog
Date Posted: 05 Apr 2018 at 11:44am
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" rel="nofollow - How are you deciding it is running at whatever PCIe? GPU--z? |
Posted By: johnnyw
Date Posted: 05 Apr 2018 at 2:11pm
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GPU-Z and HWinfo both shows those readings. |
Posted By: johnnyw
Date Posted: 05 Apr 2018 at 11:49pm
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I guess the motherboard or cpu is faulty. Even took the mobo out from the case and run the system above cardboard box, yet still same issue. I think bent CPU socket pins could cause it as the PCI-E controller is at CPU, but not going to take CPU off the socket. Bought the CPU & motherboard as bundle CPU pre installed, so not going to touch the socket simply to avoid shop blaming me of those possibly bent pins. But if someone still has suggestions im open to try anything. |
Posted By: wardog
Date Posted: 06 Apr 2018 at 3:08am
" rel="nofollow -
There's a Graphics Render Test in GPU-z, the ? displayed along the right side of the opening tab. Click on the ? , the choose "Start Render Test". Does your GPU's "speed' change while the test is active? |
johnnyw wrote:Posted By: johnnyw
Date Posted: 06 Apr 2018 at 3:12am
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Yes it changes from x8 1.1 to x8 3.0. Even tried with friends R9 390 gfx card today and still had same problem, so i guess either mobo or cpu is faulty. |
Posted By: wardog
Date Posted: 06 Apr 2018 at 3:42am
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" rel="nofollow - Johnny, The hardware you list in your 1st post. This is with only that listed installed? The EVO. Is it M.2 or 2.5"? Memory. Kit number please. You do have all 8 pins powered on the 8-pin ATX from the psu correct? 1080 or 1080ti? |
Posted By: wardog
Date Posted: 06 Apr 2018 at 3:44am
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" rel="nofollow - If that EVO is m.2, which slot/port is it secured into? |
Posted By: johnnyw
Date Posted: 06 Apr 2018 at 4:03am
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EVO is normal 2.5" SSD, Gfx card is Asus gtx 1080 strix A "non ti". Yes 8pin is plugged as is every other cable, dont think system would even start if 8pin wouldnt be plugged in :) All the relevant hardware is mentioned at the opening post. Top of those Fractal Define C case, 3x case fans and noctua D14 cpu cooler. Ram kit is: CMK16GX4M2B3000C15 |
Posted By: wardog
Date Posted: 06 Apr 2018 at 5:35am
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" rel="nofollow - Relevant huh? ok then............ |
Posted By: johnnyw
Date Posted: 06 Apr 2018 at 9:59am
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Well as non native english speaker i could of probably describe it better, didnt mean anything bad. But really case fans or cpu cooler shouldnt really have impact to PCI-E lane speeds. |
Posted By: badbri
Date Posted: 08 Apr 2018 at 12:16am
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" rel="nofollow - Do you have ANY other PCIe cards plugged in besides the Gfx card ? If you do.. which PCIe slot is it in ? ------------- https://www.passmark.com/baselines/V9/display.php?id=99573335296 |
Posted By: johnnyw
Date Posted: 08 Apr 2018 at 2:16pm
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No other cards/PCI-E devices plugged in. If i plug gfx card to the primary x16 slot (closest to cpu) it runs at x8 3.0 instead of x16, if i plug it to secodary x16 slot it runs only at x4 speed. I have now tested it with 3 different gfx card which are all verified to work on other systems, and behaviour is same with all of those. Allready filled RMA form to the shop i bought the mobo & cpu as either of those is faulty. |
Posted By: johnnyw
Date Posted: 13 Apr 2018 at 1:30am
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Quick update. Send the parts back to the shop some days ago, today got email from them that parts are faulty and they send the replacement motherboard and cpu for me. They didnt describe was it mobo or cpu or even both, but it was hardware fault anyway. I hope the new parts works, kind of sucks to buy new hardware via post just to find them faulty. |
Posted By: Xaltar
Date Posted: 13 Apr 2018 at 4:23am
Thanks for letting us know and good call sending both the board and CPU back. It really could be either so better both than the wrong part  Good luck with the replacements, let us know how it works out  -------------
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