Or mount a SPOT cooler somewhere in the case where it blows on the passive heat sink.
https://www.ebay.com/p/Antec-Spot-Cool-100-System-Cooler-Fan/1800513511
https://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=Antec+SpotCool
$10
Mounts virtually anywhere inside a case to cool your RAM, chipset, graphics cards, etc.
Flexible head and arm allow you to aim your Spot Cool fan anywhere you want to
Dual-mode switch allows you to choose either full-speed or thermal sensor mode
Thermal sensor mode adjusts fan speed according to temperature
3 pin Motherboard connector