- Joined
- Jun 1, 2013
- Messages
- 310
- Motherboard
- Gigabyte Z490 Vision D
- CPU
- I7-10700K
- Graphics
- 5600XT & 6800 XT
- Mac
- Mobile Phone
Hi all,
Wondering if someone would have a suggestion. I posted this issue in one of the golden build threads that I keep an eye all the time but given that this forum is dedicated to graphics, I might be luckier. I have a Z490 Vision D and I was finally able to install the 6800XT that had been sitting in its box for the past 3 months following the release of 11.4.
But I have some issues during POST. I simply have no video signal during POST when using DP to DP cable. The system is booting and it is loading macos because once macos is loaded, I have a video signal and a full 4k@60Hz resolution. It is just during POST. It is annoying for several reasons amongst others:
- I can't get into the BIOS if I need to
- I can't get to OC picker to boot Windows if I need to or even when updating OpenCore
- I can't select another boot drive via F12 if needed
I did a few experiments based on suggestions from the golden build forum:
1. DP from the 6800XT to HDMI on the monitor via DP to HDMI cable: I have video signal during POST all the way to macos. But because I am using an HDMI input on the monitor, I can only get 4k@30Hz (not 60Hz) due to the monitor limitations.
2. HDMI from the 6800XT to HDMI on the monitor: same as above.
3. With a DP 1.2 cable and DP to DP, the video shows up when macos is loaded. With a DP 1.4 cable and still DP to DP, the video shows up a bit earlier (when the Apple logo and the progressing bar are displayed) but still misses the POST.
4. Following a suggestion on a separate forum, the 6800XT is now powered by 2 x 8 pins (6 pins + 2 extension) cables connected to my power supply as opposed to one cable with a splitter. When I rewired the power cables I also unplugged the monitor, waited about a minute and plugged it back. Upon starting up I missed the gigabyte logo (but that is understandable because my monitor is a bit old and slow to react) but I got the Oc picker. Unfortunately it worked only once. The next time I restarted the system either via "restart" or shutdown then restart, I had no video signal until macos loaded.
5. in the monitor settings, selected DP 1.1 instead of 1.2. The end result was similar to using the DP 1.4 cable; no video during POST then Apple logo/progressing bar and then macos. And limited to 4k@30Hz.
6. Updated the BIOS to the latest version. Same issues. No video during POST.
7. Relocated the 6800 XT in the second slot. Same result. No video during POST
8. Tried all the DP ports on the card with DP 1.2 or DP 1.4 cable; same issue.
Last suggestion that was given to me but I have not tried yet is the enable CSM in the BIOS.
Note that prior to the 6800XT I had a 5600XT and no issue during POST. I have exhausted all avenues I could read on the net. Only thing I can think of is a compatibility issue with the monitor which is a bit old (2015) when using that card and DP to DP cable.
I will also rule out an issue with the power supply. The power supply is only 2-3 months old and it is a 1000W.
I only get video during POST if I use an HDMI input on the monitor.
PS: recently read on another forum someone having black screens (but still able to POST) when running some rendering applications in windows and the solution was to increase the VCCSA and VCCIO to 1.3V in the BIOS. Not sure if it would help but worth mentioning.
Thanks for the help/suggestions.
Wondering if someone would have a suggestion. I posted this issue in one of the golden build threads that I keep an eye all the time but given that this forum is dedicated to graphics, I might be luckier. I have a Z490 Vision D and I was finally able to install the 6800XT that had been sitting in its box for the past 3 months following the release of 11.4.
But I have some issues during POST. I simply have no video signal during POST when using DP to DP cable. The system is booting and it is loading macos because once macos is loaded, I have a video signal and a full 4k@60Hz resolution. It is just during POST. It is annoying for several reasons amongst others:
- I can't get into the BIOS if I need to
- I can't get to OC picker to boot Windows if I need to or even when updating OpenCore
- I can't select another boot drive via F12 if needed
I did a few experiments based on suggestions from the golden build forum:
1. DP from the 6800XT to HDMI on the monitor via DP to HDMI cable: I have video signal during POST all the way to macos. But because I am using an HDMI input on the monitor, I can only get 4k@30Hz (not 60Hz) due to the monitor limitations.
2. HDMI from the 6800XT to HDMI on the monitor: same as above.
3. With a DP 1.2 cable and DP to DP, the video shows up when macos is loaded. With a DP 1.4 cable and still DP to DP, the video shows up a bit earlier (when the Apple logo and the progressing bar are displayed) but still misses the POST.
4. Following a suggestion on a separate forum, the 6800XT is now powered by 2 x 8 pins (6 pins + 2 extension) cables connected to my power supply as opposed to one cable with a splitter. When I rewired the power cables I also unplugged the monitor, waited about a minute and plugged it back. Upon starting up I missed the gigabyte logo (but that is understandable because my monitor is a bit old and slow to react) but I got the Oc picker. Unfortunately it worked only once. The next time I restarted the system either via "restart" or shutdown then restart, I had no video signal until macos loaded.
5. in the monitor settings, selected DP 1.1 instead of 1.2. The end result was similar to using the DP 1.4 cable; no video during POST then Apple logo/progressing bar and then macos. And limited to 4k@30Hz.
6. Updated the BIOS to the latest version. Same issues. No video during POST.
7. Relocated the 6800 XT in the second slot. Same result. No video during POST
8. Tried all the DP ports on the card with DP 1.2 or DP 1.4 cable; same issue.
Last suggestion that was given to me but I have not tried yet is the enable CSM in the BIOS.
Note that prior to the 6800XT I had a 5600XT and no issue during POST. I have exhausted all avenues I could read on the net. Only thing I can think of is a compatibility issue with the monitor which is a bit old (2015) when using that card and DP to DP cable.
I will also rule out an issue with the power supply. The power supply is only 2-3 months old and it is a 1000W.
I only get video during POST if I use an HDMI input on the monitor.
PS: recently read on another forum someone having black screens (but still able to POST) when running some rendering applications in windows and the solution was to increase the VCCSA and VCCIO to 1.3V in the BIOS. Not sure if it would help but worth mentioning.
Thanks for the help/suggestions.