RTX 4080 does not POST

[YouKnowZampe]

Hello, 

 

just upgraded to RTX 4080 from RTX 3080. But I can’t get it to POST consistently. If I remove the CMOS and remove the power from the PSU it boots sometimes and lets me go to bios or windows. If I then reboot/shutdown I have to remove the power again. So something is not cooperating with each other. I think it might be my B450 MOBO but it should still work. The POST led stops at VGA and the fans ramp up to 100%. The rest of my setup is ryzen 7 5700x3D and 32gb of ram. 
 

1. Should it work?

2 do I need to upgrade to B550 or AM5? 
 

/ Zamplex 

[Hinjima]

38 minutes ago, YouKnowZampe said:

Hello, 

 

just upgraded to RTX 4080 from RTX 3080. But I can’t get it to POST consistently. If I remove the CMOS and remove the power from the PSU it boots sometimes and lets me go to bios or windows. If I then reboot/shutdown I have to remove the power again. So something is not cooperating with each other. I think it might be my B450 MOBO but it should still work. The POST led stops at VGA and the fans ramp up to 100%. The rest of my setup is ryzen 7 5700x3D and 32gb of ram. 
 

1. Should it work?

2 do I need to upgrade to B550 or AM5? 
 

/ Zamplex 

Yes it should work.
No, you shouldn't need to upgrade to a b550 or AM5.

 

Is this a new or used 4080?

[YouKnowZampe]

6 hours ago, Hinjima said:

Yes it should work.
No, you shouldn't need to upgrade to a b550 or AM5.

 

Is this a new or used 4080?

Used

 

the seller had videos where it worked, and I got it to boot a few times but after a reboot/shutdown I had the issue again.

[Renegade042]

PSU?

[YouKnowZampe]

8 minutes ago, Renegade042 said:

PSU?

The psu is 1 day old. Bought a new so I could have the atx 3.1 and I had to few cables for the adapter