I agree with the above concerning "gaming notebooks". That is a fluffed up "marketing term" that in reality, makes no technical sense.
Consider this. A PC with a large mid or full tower case is still challenged to keep the innards properly cooled when tasked with heavy gaming. And these cases support many large (wide and thick), high volume (CFM) cooling fans to provide massive amounts of cool air flowing through the cases. Notebook cases, by their very nature, are designed to be light and "thin" - with "thin" being the operative word. Even if the maker puts two large fans in there, because they must be so thin, there is no way the blades can be thick enough to scoop up and shove lots of air through the case. And because the cases must be sturdy and support many ports and slide in devices (extra drives, cards, etc.) there is very little room for air intake or exhaust vents and that hampers good air flow too.
And because everything inside the case is so jammed together, there is very little room to allow what air is pushed in to flow throughout and extract the heat efficiently. And finally, notebook cases are NOT designed to allow the user to easily open a side panel for thorough cleaning of all the heat-trapping dust that gets drawn in.
So the problem is, makers can jam PC power into these tiny cases, but they cannot pack in the necessary cooling that hardware needs. So what happens? Notebooks run much warmer (dare I say "hot") and this means they will frequently throttle down to prevent stability issues - which of course, throttles down performance.
Then there are the issues other have already mentioned. They have expensive but limited to no upgrade capability. To ensure full speed performance, you must be tethered to a wall outlet anyway. They are expensive to repair (even if able to DIY - which most users are not). And with notebooks, you are forced into buying each time, a new keyboard, mouse, speakers, and of course, a "tiny" monitor. So unlike a PC where you can carry over many of those components to your new PC, you must buy all new with every new computer. There is no component "upgrade" path to stay current by "evolving" your computer over many years via "piecemeal" component upgrades.
These are the same reasons, in spite of what notebook marketing weenies tell us and want us to believe, there is no such thing as "desktop replacement" notebooks either.
So, if you must have a portable computer, and you want one for gaming, make sure you take the marketing hype about "gaming notebook" with a box of salt!
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