[NAME] & [NAME]  Thank you for your answers!   I solved the issue by myself ... The "original" fan of the tower cooler was the solution ... I got one here in Germany from the brand "Xilence" ... it's probably the cheapest you can get here ... Less than 13€ (around 16 USD) on amazon.de for a tower cooler including fan + thermal paste & delivery by amazon ... The best part: the preinstalled screws fit perfectly to the dell backplate ... it is pre-assembled ... unscrew the old cooler, put new thermal paste on the CPU, and mount the new cooler at the same place ... Of course, you'll need 5pin to 4pin adaptors for both fans (or a least one for the CPU cooler)   So if someone is looking for a replacement of the whole cooling system of your Dell 3020 / 7020 / 9020 (perhaps later models as well) ... Take the "Xilence Performance C Series I402" ... [IMAGE]   It's available on most European amazon-market-places ... The max. temperature of the Intel Xeon E3 1271v3 is now down by 15°C, and there is no more thermal throttling.   So the Optiplex 7020 can stay for a few years, at least as long the Windows 10 is supported ... Or there is a solution found to install Windows 11    [NAME]  Yes, It would be a possible solution to buy a replacement fan ... but I' couldn't find any new and ... All the used ones will probably have the same problem ... I had seen a few YouTube "How To" videos on refurbishing fans ... but I didn't manage to disassemble mine without putting much pressure on it ... I don't want to break it ...
Hello Dell Experts ... Got a "noisy" issue here ... The Fans of my Dell Optiplex 7020 were very noisy (perhaps became so with time) ... So i decided to replace the standard CPU-cooler with a small 92mm tower cooler and also replaced the rear fan ... Since I'm using SSDs only the PC became ultra-silent ... now I can hear the "coil whining" of my monitor's power supply ...   The real issue here is ... Each boot process is interrupted with an alarm "Alert! Rear Fan Failure" ... The fans are both spinning but with a far lower speed ... they get faster after windows login appears ...   I'm using the autoboot feature from the BIOS to access the PC through remote desktop if needed (also it's ready to work then I need it in the morning) ...   The alarm prevents any possibility to complete the boot process automatically ... So is it possible to set the BIOS to ignore such alarms and boot even without the rear fan? Thanks upfront for the help!
Dell Optiplex 7020: Possible to ignore rear fan failure on boot?