Dell computers use BTX design, which involves a BTX HSF system that blows air from the front directly to the rear.
99.99% of aftermarket CPU coolers use ATK designs. So no, it will not be compatible.
However, BTX designs are generally more efficent than ATX designs, so a BTX heatsinkfan will be better than a stock or cheap ATX heatsinkfan.
Clean out your current heatsink and see if it improves your temperatures. If you were planning to buy the AC Freezer7 Pro for overclocking, note that Dell motherboards usually have their BIOS locked so you can't overclock.