Changing your Intel® Dual Band Wireless-AC 7260 for the Intel® Tri-Band Wireless-AC 17265 will not make you get the satisfying results you want. Your best option would be to consult with Dell* and/or HP* about what are the compatible systems they have available for Intel® WiGig. You must consider that these systems will work only with their own docking device and none other. Check these links: Dell Wireless Doc - WiGig and HP Advanced Wireless Docking Station - Docking & port replicators - HP: F7M97AA#ABA for further information. You may want to contact Dell and HP here: Chat Technical Support | Dell US and Contact HP - Phone Assist | HP® Official Site
*Please know that any wireless adapter replacement is not supported by Intel. Please check the link below for further information on this matter.