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Z370 Extreme 4 - GFX card not running at 16x
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johnnyw View Drop Down
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    Posted: 05 Apr 2018 at 3:27am
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


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Xaltar View Drop Down
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Points: 25268 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 05 Apr 2018 at 4:06am
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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johnnyw View Drop Down
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote johnnyw Quote  Post ReplyReply Direct Link To This Post Posted: 05 Apr 2018 at 11:01am
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.


Edited by johnnyw - 05 Apr 2018 at 11:03am
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 05 Apr 2018 at 11:44am
How are you deciding it is running at whatever PCIe? GPU--z?
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johnnyw View Drop Down
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GPU-Z and HWinfo both shows those readings.
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johnnyw View Drop Down
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote johnnyw Quote  Post ReplyReply Direct Link To This Post Posted: 05 Apr 2018 at 11:49pm
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.


Edited by johnnyw - 05 Apr 2018 at 11:50pm
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2018 at 3:08am
Originally posted by johnnyw johnnyw wrote:

GPU-Z and HWinfo both shows those readings.


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?
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johnnyw View Drop Down
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Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote johnnyw Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2018 at 3:12am
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.
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2018 at 3:42am
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?


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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2018 at 3:44am
If that EVO is m.2, which slot/port is it secured into?
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