Bottom line:  that system was never designed to handle that CPU.  You may face a no-POST (the system firmware isn't coded for it), and even if the system will POST, it'll likely run so hot the CPU throttles to the point that the MX CPU is actually slower than the MQ CPUs the system is designed to handle.  
Hello everyone.I find DELL Precision M4800 to be an optimal choice for my budget at the moment. It comes with great cooling system (according to notebookcheck.net) and has good CPU on the board. Particularly these 2 components are the the major things I was looking for.And such a combination got my curiosity. NO video editing or CAD work expected. Audio work only.So, at first I thought the model with i7-4940MX would fully cover all my needs. According to PassMark Benchmark, GeekBench 5, userbenchmark and similar it really doesbut the problem is that all other CPU for that model (4800MQ, 4810MQ, 4900MQ, 4910MQ) have 47W TDP and cooling system is designed to handle those CPU pretty well. And I found no info about 57W TDP. All I found was only bunch of discussions about constant overheating complaints...Moreover, on notebookcheck.net it is clearly said:"The i7-4940MX is rated at a TDP of 57W including graphics card, memory controller and VRMs. Therefore, the CPU is only suited for laptops 17-inches or greater"So one can think about this CPU only when choosing M6800 ? How correct is that ?So my question is : how good is Precision M4800 with i7-4940MX in the context of cooling system ? Does it work well ? Does laptop suffer from throttling or overheating ? Or should I choose i7-4910MQ of 47W instead ? I asked some of my local sellers, and also some Amazon sellers, and received 50/50 answer, some say it is capable to stay cool, some say no way pick the i7-4910MQ. But I dont want that one, it seems to be weaker for today's needs.Would you please share your opinion and experience on this ?Much obliged
Precision M4800 i7-4940MX 57W TDP: can cooling system handle that?