Solved PCI-E 8x Slot not working on new MB

April 24, 2020 at 04:43:31
Specs: Windows 10, i9 9900k
I just built a new PC and everything posted ok. I installed the graphics card in the 16x slot but due to the amount of heat coming off of it I would like to put it in the 8x pci-e slot. When I installed the gtx 980ti in the 8x slot it's not detected by the system so I am not getting any video. The onboard graphics is working fine and when the card is in the 16x slot it is working fine as well. I didn't find anything helpful in the bios in regards to the PCI-E slots. Any thoughts on what I could do to troubleshoot the problem? Thank you for any suggestions.

Case: Fractal Design Define XL R2

Motherboard: MSI Z390 Gaming Pro Carbon AC

Processor: 9900k

Ram: Corsair Vengeance Lpx 2 x 8gb 300mhz xmp

Power Supply: Corsair TX850M

Graphics Card: EVGA GTX 980ti

CPU Cooler - Gemini II S ( not 9900k worthy, Just ordered Noctua DH15-S)

HDD - M2 1TB Samsung 970 EVO Plus

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April 24, 2020 at 05:54:24
The manual recommends using PCI_E1 when installing a single card.

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April 24, 2020 at 06:20:06
Thank you! That’s frustrating but I still want to say the slot should work but maybe it requires a card in the pci_e1 and the 8x slot. This is the first ATX board i’ve had with 2 slots for the graphics cards. Is there a way to confirm that the slot isn’t defective?

The main reason I want to move it down to the 8x is due to the 980ti getting pretty hot and it’s close to cpu cooler. I figured giving it more space will lower temps. The 9900k runs pretty hot. I upgraded from a 2500k so I am not used to seeing such high temps (65+ Celsius) while gaming for an hour or so. I ordered a new cpu cooler which should help.

Thank you!

message edited by yakird520

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April 24, 2020 at 08:41:38
✔ Best Answer
A better air cooler should help a lot, I use Noctua 14 and (idle 30's C, max low 50's C) it is great just make sure that you do not over apply (or under apply) thermal compound!!! See:
for more details

You have to be a little bit crazy to keep you from going insane.

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