Dell wireless 1515 card: This is a Dual-Band card which supports 2.4 GHz and 5 GHz.

Inspiron 1545 was shipped with 3 different wireless cards: Scroll down to check the system specifications.Select 'System Configuration' and expand 'Components'.Enter your system's service tag and click on 'Submit'.You should first check the wireless card install on both of your laptops: Both these laptops were shipped with different wireless cards with different specifications.