I had to remove the Dell heatsink from my CPU, but i mounted a slot 1 golden orb to it just fine after i removed the old one. As for the retention mechanism, you need a SECC2 retention mechanism ...

Dell's latest Inspiron 15 7000 clamshell laptop packs a punch with an Intel Core i7-9750H and an Nvidia GeForce GTX 1050 GPU, along with a big 15.6-inch screen, all for just over a thousand dollars.