Have problem with RX5700XT Red Devil card in ITX build

ZoomZoom

I recently bought a RX5700XT Red Devil and a Gigabyte B550I pro ax, with an R5 3600. I put together the build in an NZXT H1 case, and it will not display anything. Went to family members house to troubleshoot. swapped my GPU for his which is a GTX760 and it works perfectly in my system. The weird thing is I put my RX5700XT in his system and it works. While using his GTX760 I updated windows and installed AMD drivers on the system. Swapped back the system and it will still not display. After about 2 hours of troubleshooting, we got it to come up once, it was very choppy. I tired to update drivers while it was on. It installed but after a restart. Can't get it back up again. Would like some help with this. Thanks in advance. 

PowerSpec_MichaelB

Welcome to the forum, @ZoomZoom. This is certainly an interesting situation, and it appears you've done quite a bit of troubleshooting already. Based on the details you've provided, I am leaning towards PCIe 4.0 being the culprit here. The fact that the GTX 760 (PCIe 3.0 card) worked fine in your system, and that your 5700XT works fine in your friends system (likely a PCIe 3.0 slot, given the older Nvidia graphics card), leads me to believe this is related to the PCIe bandwidth configuration. To test this, can you use your friends GPU to get back into the BIOS, navigate to Settings > Miscellaneous and adjust PCIe Slot Configuration to Gen 3.

Afterwards, reinstall your RX 5700 XT and see if you can get into BIOS with it. If you get visuals, this will confirm that something is up with how the PCIe Gen 4 interface is interacting with your card, and would likely require a BIOS update on the motherboard or VBIOS update on the graphics card to resolve the issue. If this doesn't resolve your issue, I would look into isolating as much as you can. Remove all but one DIMM of memory, remove your SSD, try a basic known working monitor/cable, and see if it can POST. In the meantime, I'll look around online to see if others are experiencing a similar issue with your hardware configuration.

ZoomZoom

@TSMichaelB, Thank you so much. The PCIe was the issue. The Motherboard and GPU are PCIe 4.0 but the Riser cable was Gen3. It was such a quick fix I couldn't believe it. You sir are the best! I really appreciate the quick response as well. You have a good day. The Computer is working beautifully now. Thanks

PowerSpec_MichaelB

ZoomZoom said:

@TSMichaelB, Thank you so much. The PCIe was the issue. The Motherboard and GPU are PCIe 4.0 but the Riser cable was Gen3. It was such a quick fix I couldn't believe it. You sir are the best! I really appreciate the quick response as well. You have a good day. The Computer is working beautifully now. Thanks

That is fantastic news! I completely forgot to ask about a riser, given most ITX builds now utilize risers for vertical mounts for a slimmer form factor. Happy to hear you were able to get to the bottom of it and resolve it. Should you have any further issues, please do not hesitate to reach out! Enjoy your system and have a wonderful rest of your week.