Latitude E6540 with and without AMD

l had a Latitude E6540 with an AMD 8790 controller as well the Intel 4600 one. It got water damage although the hard disc was okay; so my PC repair guy sourced a machine with what he thought was the same spec (apart from the hard drive) so that he could put the old drive in the new machine.

However, it turned out that the machine he sourced didn't have the AMD controller, only the Intel one. But he advised me to go with it because he said he'd done some research into the E6540 and discovered that the models with the AMD controller were prone to overheating and that the AMD controllers were liable to eventually fail as a result - so he thought the new machine would be more reliable as a result of not having the AMD controller. He said that Dell fairly quickly discontinued the models that had the AMD controller built in, and latterly only supplied the models that only had the Intel controller on the motherboard.

At first it seemed that the new machine was still able to do everything I needed to do, so I went along with his advice - but now I've discovered that although it can record true HD (1080p) videos, which I need to be able to do, my video editing software really struggles on the new machine - whereas it performed fine on the old one. It's just about useable but it worked far more smoothly before. I had tested the ability to record in HD before agreeing to go ahead with it but hadn't thought of testing the ability to edit videos.

So my question is: is he right that the machine is likely to be more reliable without the AMD controller and that the AMD controller on the Latitude E6540 was prone to overheating and eventually to failing as a result? Or would I be better off trying to source a Latitude E6540 with an AMD controller, given that some of my important software struggles to run without it?

There are complex reasons why I chose the E6540, which I don't want to repeat now as I've explained them in previous threads - but that's definitely the model I need. I'm just not sure whether I should go back to the version with the AMD controller or not.

Dave