Any experience out there upgrading a Dell's CPU and boot drive? From what I read, finding documentation for a Dell can be frustrating. I have a Latitude 6540 with an i7-4800M at 2.7 GHz, and a HGST 320GB hard drive. Bios is A12. If I could move to a CPU above 3 GHz, I might swap in a SSD. I've built or upgraded several desktops, but never climbed the Dell wall before. Suggestions?