Acer Aspire 4755g Processor Upgrade

JayAr25
JayAr25 Member Posts: 4 New User
edited October 2023 in 2020 Archives
Hello I have an Acer Aspire 4755G Laptop which has a Intel Core i7 2670qm 2.2gHz and i Like to upgrade with Intel Core i7-3940XM if possible

Best Answer

  • aphanic
    aphanic Member Posts: 959 Seasoned Specialist WiFi Icon
    Answer ✓
    Checklist for processor upgrades (most data can be found in the specs of the manufacturer, Intel in this case):
    • Socket, it's the receptacle in which they plug, it has to be the same. ~> It is in this case, rPGA988B

      NOTE: If the processor were soldered, i.e. BGA instead of PGA, while it is certainly possible to replace one with another it'd be far from trivial for most people.

    • Bus type and memory support, they ought to match too. ~> Both use DMI (2.0 I think) for the buses and the memory controller of the new one supports the same and more types of RAM as the old one.

    • TDP, complex thing to explain... you can think of it like this: the higher the value the more power hungry the processor it is. Going for more to less presents no problems, going from less to more may mean the laptop runs hotter (because you replace the processor, not the cooling system).

      The one you have has a TDP of 45W and the new one 55W. Still the new one is manufactured in a smaller lithography (i.e. it's made of smaller parts inside) so it should be more efficient overall.

    • Last but not least, firmware support. And this can be tricky, the only way of knowing is to either replace it and see what happens, or search the net to see if anyone did the replacement already and it worked (or not). Some manufacturers limit which processors can be run in their machines, or rather have a whitelist of them.

      If it isn't supported just because of the firmware, there are several BIOS modding communities that could help in that regard, maybe. Keep in mind that flashing a modded firmware is by no means sanctioned by the manufacturer and if you were still within the warranty period you'd void it completely I believe haha. But that's the least concern give the age of the machine at this point.
    So... personal opinion, I'd say you're good to go, aside from the firmware support the other things seem to check; still I guess you won't know until you try. And by the way, if you do replace it, don't tighten too much the screws of the cooling solution that goes on top of the processor, sometimes if they're too tight making too much pressure over the chip the machine refuses to boot up :D

Answers

  • aphanic
    aphanic Member Posts: 959 Seasoned Specialist WiFi Icon
    Answer ✓
    Checklist for processor upgrades (most data can be found in the specs of the manufacturer, Intel in this case):
    • Socket, it's the receptacle in which they plug, it has to be the same. ~> It is in this case, rPGA988B

      NOTE: If the processor were soldered, i.e. BGA instead of PGA, while it is certainly possible to replace one with another it'd be far from trivial for most people.

    • Bus type and memory support, they ought to match too. ~> Both use DMI (2.0 I think) for the buses and the memory controller of the new one supports the same and more types of RAM as the old one.

    • TDP, complex thing to explain... you can think of it like this: the higher the value the more power hungry the processor it is. Going for more to less presents no problems, going from less to more may mean the laptop runs hotter (because you replace the processor, not the cooling system).

      The one you have has a TDP of 45W and the new one 55W. Still the new one is manufactured in a smaller lithography (i.e. it's made of smaller parts inside) so it should be more efficient overall.

    • Last but not least, firmware support. And this can be tricky, the only way of knowing is to either replace it and see what happens, or search the net to see if anyone did the replacement already and it worked (or not). Some manufacturers limit which processors can be run in their machines, or rather have a whitelist of them.

      If it isn't supported just because of the firmware, there are several BIOS modding communities that could help in that regard, maybe. Keep in mind that flashing a modded firmware is by no means sanctioned by the manufacturer and if you were still within the warranty period you'd void it completely I believe haha. But that's the least concern give the age of the machine at this point.
    So... personal opinion, I'd say you're good to go, aside from the firmware support the other things seem to check; still I guess you won't know until you try. And by the way, if you do replace it, don't tighten too much the screws of the cooling solution that goes on top of the processor, sometimes if they're too tight making too much pressure over the chip the machine refuses to boot up :D
  • JayAr25
    JayAr25 Member Posts: 4 New User
    Oh i see 45w only and viewed using Cpu-z program. Maybe i can check the clockspeed of 2820qm processor hehe. My other problem is, the processor heats up when gaming and reaches 90°c in 1hour any recommendations? I have already disassembled the laptop and heatsink and cleaned the fan but still the same.
  • JayAr25
    JayAr25 Member Posts: 4 New User
    I come up with an idea of placing a aluminum heatsink above the  heatpipes and i think it is a good idea. Without turbo boost, my cooling system can prevent thermal Throttling but if i turn it on, the cpu heats up quickly and throttles all the time when i launch the gta v. What do you think about placing additional heatsinks? And improving the airflow by means of cutting some of the air vents of the casing?


  • JayAr25
    JayAr25 Member Posts: 4 New User
    By the way, Thank you so much for your opinions 
  • aphanic
    aphanic Member Posts: 959 Seasoned Specialist WiFi Icon
    Hmmm... I've never modded a laptop heatsink before to be honest, but the science is sound: a bigger heatsink keeps things cooler (adding an aluminium block to the pipes would transfer part of the heat to it), but I'm not sure if cutting more vents in the case would be beneficial.

    The thing is the fan is able to push X amount of air through it, if you add more vents it won't make it suck more air (constraints would be its fin design and speed at least, but I'm sure there are way more things to take into consideration when designing fans). Cooler air in the intake certainly helps, but there's no easy way to get that.

    By the way, how would that aluminium piece be cooled? The basic working of the fan(s) is to get fresh air (from below in this case) and force that air through part of the copper pipe / aluminium fins so there's a heat exchange, air gets hotter and the metal cooler, ultimately keeping the CPU & GPU at lower temps for longer.

    Just by having it you may see improvements, there are fan-less systems out there that rely on passive cooling through heatsinks alone, but those systems generate way less heat. It seems difficult to improve thermals in laptops :anguished:

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