Hi, Just purchased and installed a Geforce RTX 3080 XC3 12G-P5-4868-KL.
 
I installed it with the radiator a the top of the case and two separate 8 pin power cables. GPU temps 29c. Noticed that all three fans come on at start up but the one on the card powers off after about 5 or 10 seconds.
 
checked for latest monitor and motherboard updates.
 
installed and reinstalled latest drivers with clean install, even went back one driver.
 
When into control panel and set max performance and debug checked.
 
It happens constantly windows, browsing or gaming. I'm thinking card might be bad but want to try everything before I make the call.
 
BTW my previous card had no issue 1060.
 
Thanks                                                                                                                                                                                        ASUS ROG STRIX B560-A [motherboard]
EVGA RTX 3080 12G-P5 4868-KL [graphics]
INTEL I5-11400 2.6GHZ 12MB CACHE LGA1200 [processor]
CORSAIR DDR4 2X16GB 3600MHZ VENGEANCE PRO [memory]
SABRENT ROCKET 4 PLUS M.2 PCIe GEN4 X4 NVMe 1TB [Hard drive]
 EVGA 850 GQ 210-GQ-0850-V1 [power supply]
ANTEC DP502 FLUX DARK PHANTOM  [case]
SAMSUNG G9 ODYSSEY C49G97TSSN  [monitor]
WINDOWS 11 HOME 64 BIT [os]

The card fan shuts off way earlier, especially in Normal switch bois. It lags way behind in the heat curve, Try linking the fans and make a custom curve and it should stay spinning, I always set a floor of 30% and it keeps cool and blows the card down after a heavy load.

Good to know!