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Help with new 3090

YourMateSonic
By YourMateSonic
in Troubleshooting
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Hello everyone.

I made a post a couple days ago on here but all the comments were based around my PSU which I know isnt the issue so I'm gonna try and be clearer than I was last time.

Whenever I install my 3090, I never get anything displayed on my monitor. I know that my PC is booting all the way to windows because I can see my streamdeck is working and hear windows making notification chimes and whatnot. 
If I install my old 1080 back in, it works fine. The 3090 works in neither the 16x slot nor the 8x slot.
 

I've installed the 3090 into a brothers computer and it works fine. I've installed his 2070 into my computer and it works fine. I have also had both my 1080 and 3090 installed at the same time and my motherboard can see my 1080 in a PCIE slot but not the 3090.

I have an Aorus z390 Pro and an 8700k installed in it all running from a 1000w PSU.
 

Here is a list of other troubleshooting methods I've tried:
Resetting CMOS
Using DDU to remove old NVidia drivers
turning off the iGPU
Using different power cables from my PSU to the GPU
Trying both of my sticks on RAM individually
Turning off UEFI and turning on Legacy, and then going back when that didnt work
Edit: I also updated my BIOS
 

This is really just a last ditch effort at this point. I'm fairly certain I just got unlucky and for some reason this specific motherboard just wont work with my specific GPU. Any further help will be greatly appreciated. Thanks!

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Hate to say it but if old GPU works and new one doesn't I would be looking at a dead GPU being the most likely culprit. Your PSU should easily manage unless it's a garbage brand which given the other hardware you specified I would doubt, however I would add to that that maybe with the 1080 in as well you might be pushing the limits under load but not idling. 

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1 minute ago, Chris Fortune said:

Hate to say it but if old GPU works and new one doesn't I would be looking at a dead GPU being the most likely culprit. Your PSU should easily manage unless it's a garbage brand which given the other hardware you specified I would doubt, however I would add to that that maybe with the 1080 in as well you might be pushing the limits under load but not idling. 

I would have thought the same thing but my brother was gaming on the thing all last night. We cranked a few ray traced games and the thing handles easily. It's the reason I suspect my motherboard is the issue.

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Many reviews have noted significant spikes but that should not affect boot/idle behaviour. Thinking about it perhaps the line load on the PSU to GPU is an issue rather than the overall power capacity of the PSU? Just spitballing here trying to think of something that fits your data

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1 minute ago, YourMateSonic said:

It could be. I was just fairly certain it wasnt because it runs games perfectly on the older hardware and has never let me down. Maybe the power draw of the 3090 is too much. 

Could it be mobo drivers? Try updating them. Im no expert but it's worth a shot since its a brand new card

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3 minutes ago, Chris Fortune said:

Many reviews have noted significant spikes but that should not affect boot/idle behaviour. Thinking about it perhaps the line load on the PSU to GPU is an issue rather than the overall power capacity of the PSU? Just spitballing here trying to think of something that fits your data

That might be it. I was thinking if it works with 2 other GPUs than it should work with the better one, but the PSU is on the older side now. Still good quality, but older. I'll try and dig my brothers PSU out and give it a shot.

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4 minutes ago, YourMateSonic said:

That might be it. I was thinking if it works with 2 other GPUs than it should work with the better one, but the PSU is on the older side now. Still good quality, but older. I'll try and dig my brothers PSU out and give it a shot.

Worth a try if only to eliminate a dead end. I actually hope this is a dead end as high end PSU's are just as hard to source as GPU's atm

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