Dell Latitude E6540 OR Precision M4800 ..........!

Hi,

I am looking for new laptop and confused between below two.

Dell Latitude E6540 OR Precision M4800 ..........!

I already own Latitude E6540 from last two years, now it is getting warm and hot and some time blue screen and shut down and now slow too.

I need something better, longer working hours in normal environment (no air conditioner and 45 degree temp.)

Price is not a problem.

I need a machine that can work for 18 hours a day without shutting down.

I am not...

Dell Latitude E6540 OR Precision M4800 ..........!