I tried the Following Method and I could able to install Mavericks 10.9.3. on my Latitude E6540 with QE/CI.(USB Pendrive)
https://osxlatitude.com/index.php?/topic/6461-guide-e7440-with-clover/
Right Now
Intel 4600 is working
Audio is Working with internal speakers, exception noise from headphones and external speakers.
ATI 8790 is not working.
Wifi Intel N6300 Ultimate is not working.
If any one is having Details for 8790 and N6300 Please reply.