I am pretty sure this thread will once again be full of desktop naysayers trying to convince you away from gaming laptops and back to desktops, maybe they feel threatened desktops will become a rarity in the future or something... Anyway, I am a laptop gamer, and here is my view on it (I am actually currently on the market for a new gaming PC, and with 90% certainty it will be a laptop and not a desktop):
VVNiels: I plan to replace my fixed PC with a game laptop. I wondered who is playing on a laptop and what the experiences are with regard to heat dissipation, etc. With my current game PC, I never worried about the temperature of the CPU and the graphics card. I wonder how the fans will perform after several years of use in the laptop. I clean my PC thoroughly once a year.
Yes, thermal control is a bigger problem on (gaming) laptops than desktops, so you should pay attention to those in laptop reviews, especially as nowadays most laptop makers try to make their laptops as thin as possible, which tends to make the problem worse. One thing that somewhat helps with the problem nowadays is that most laptops have now gone fully SSD, not even offering an option for an internal 2.5" HDD (nor a DVD-drive, but those went away even sooner). With SSDs, laptops can both remain smaller/thinner and SSDs naturally produce much less heat too than HDDs. While I prefer the extra capacity of HDDs, I guess this is a reasonable trade-off: for archives I then use bigger external USB HDDs.
Naturally laptop CPUs and GPUs also tend to run on lower frequencies than their desktop counterparts, in order to use less power/produce less heat.
To me it would appear these design decisions would help laptops to remain cooler:
- As said, the laptop is not as thin as possible, but thicker. This allows for better thermal control, better fans etc. Too bad the trend appears to be towards thinner laptops, and most laptop reviews also give extra points for a laptop for being thinner, which to me doesn't make that much sense in gaming laptop reviews (they should always favor better thermal control over the thinness of the laptop in gaming laptop reviews, IMHO).
- The laptop case is made of e.g. aluminum or magnesium alloy, instead of cheap plastic. This lets the whole case help with the heat dissipation as then the whole case is removing heat from the innards, not only the fans/heatsinks. I guess this can also be tricky to design and implement so that the keyboard won't feel uncomfortably warm.
I think this latter is what e.g. Intel did with this laptop:
https://www.youtube.com/watch?v=YlkFUB_XLVs I wish more laptop makers would design their laptops like that.
Cleaning a laptop (ie. completely opening it up that you can reach all the innars to blow all the dust away) takes more effort than on desktops, but usually can be done (not sure about the ultrathin MacBooks and ZenBooks and whatever. maybe they are glued shut for all I know, like modern mobile phones). My ASUS G75VW laptop is now like 8 years old, still working great (besides naturally not being able to run the latest games fine, the most demanding games I can fathom playing on it are like The Witcher 3 and GTA V, and those in medium settings or so).
This is its maintenance history:
- Besides blowing some canned air into it from the air vents once in a while, I have opened it up once completely during these years to clean its innards completely. Yeah there were quite a lot of dust inside which I blew out.
- At the same time, I replaced both of its two fans (GPU and CPU fans), which was the main reason I decided to open it up completely (ie. remove its keyboard etc.). One of the fans had started keeping extra noise so I figured it is about to break up and stop working, so I ordered replacement fans online and then changed both just to be sure. The laptop has worked great ever since.
ASUS G75VW is one of those older thicker and more massive gaming laptops so its thermal control and cooling is quite good, ie. less overheating problems. This even though it has three 2.5" (3x 2TB) HDDs inside which produce more heat than modern SSDs. It originally had a DVD-RW drive inside but once it got broken, I took it out and replaced it with a third HDD. I have an external USB DWD-RW drive if I ever need to use it.
So to your question about how long the fans last: they are normally replaceable in laptops. The only question is whether you can find suitable fans for your laptop, but at least I didn't have problems finding ones for my G75VW, many years after I had bought the laptop. I just googled for G75VW fans and ordered some third-party replacement fans online. I guess the Chinese produce these quite a lot even for older laptop models.
Of course, if in doubt, you can always buy replacement fans in reserve already when the laptop is new, if you need to replace them at some point in the future. I guess it also helps if your laptop used to be quite popular and from a big manufacturer, probably easier to find replacement parts years later then. In my case, the fans worked for like 5 years before one of them started giving warning sounds of possibly breaking up.