  The server is working as intended. There is nothing to fix. This has been reported before and we have investigated it. Our 12th generation servers had a massive overhaul with thermal and acoustic design. Because of this the chassis can get hot to the touch at the rear of the system, but it poses no risk to system components. You can change the default fan control to increase air flow and reduce the exhaust temperature, but this will increase noise and electricity usage. Go into the iDRAC - iDRAC Settings>Thermal. Change the User Option to Fan Speed Offset and set the Fan Speed Offset to High Fan Speed Offset. Thanks
      hi we purchased 6 servers from dell india.  we are facing a severe heating issue on top of the chassis above the raid card with all these 6 servers. server configuration R420 - single hexcore processor 2.2 ghz, 32gb ram 4 X 600 gb 15000 rpm drives(configured as 2 drives in raid 1 + 2 drives in raid 1) these servers are placed in a datacenter -- temperature is around 18 deg C we are facing a severe heating issue at the on top of the chasiss just above the raid controller when the servers are placed one above the other like they are normally placed in a datacenter the servers heat up between 50.4 - 57 deg celcius dell support has changed motherboard, raid card , power supply etc of one of the above servers which is non-production (heating to 50.4 deg celcius) but the issue is not resolved On closer examination of the raid controller card i noted that the fins of the heatsink on top of the raid controller card --  instead of being parallel to the airflow is actually perpendicular to the air flow and is actually trapping all the heat the same card in a R620 server has the heatsink fins parallel to the air flow which remains cool has anybody else in this forum noted this and are facing such a heating issue ? could you please check this and let me know the resolution to this problem can the heatsink be turned around by 90 degrees so that the fins of the heat sink are parallel to the airflow ? thanks for your help  rajesh mahadevan mumbai , india      
R420 chassis heating due raid controller card