I was thinking about changing my laptop CPU to a more powerfull one. I've already checked the chipset compatibilities and I thought about replacing my Intel Dual Core T4200 2.0 GHz for an Intel Core 2 Duo T9400 2.53 GHz. But, as it's a laptop, the cooling system will remain stock. The T4200 voltage range is 0.975V-1.15V and the T9400 voltage range is 1.05V-1.162V. With the T4200 I'm getting pretty good temperatures (I think). About 30ºC idle and 60ºC load. So my question is: despite the T9400 increased clock speed, but practically the same core Voltage (only +0.012V), would I have much higher temperatures than I have with the T4200, or just a little bit higher? Is the CPU clock speed or voltage that increases temperature?
And I thought about two more CPUs to replace the T4200, and they are: Intel Core 2 Duo P8400 2.26 GHz and the Intel Core 2 Duo P8600 2.40 GHz, both with voltage range 1.05V-1.15V.
What do you recommend?
changing a dual core to a dual core will do nothing... the T is laptop oriented but the core 2 duo and pentium dual-core share many of their components... the core 2 duo sure will perform better but not by far...
Anyway, are you sure your motherboard will run a 1066mhz CPU cause although it's the same CPU socket, maybe your laptop motherboard doesn't support 1066FSB... (the t4200 is 800mhz and all the other CPU listed here are 1066mhz)
PS: the T9400 score 1752 in passmark and the t4200 1270, the p8400 scores 1521 and the 8600 1630... in comparison the slowest i3 scores: 3862 (and it's a dual-core too) Maybe it's the time for an upgrade... anyway i don't think you want to throw money out when buying a 125-150$ CPU and notice the difference only in bench cause it's roughly 25-30% more, nothing else... and the slowest I3 is 110$ and more than the double performance in all type of scenarios...
Temperature-wise the Core 2 chips run amazingly cool. Your cooling system should handle that chip just fine. A good way to get that some certainty would be to go to the manufacturer of your laptop, look it up and see if they produce a model of that same laptop with a similar chip to the one you have in mind. Manufacturers don't like to use multiple cooler types in the same laptop model. There will be one cooler type for it and they will use the same cooler for all CPU chips they support. If the laptop maker lists a chip like the one you want to put in as an option, then you are set.
Keep in mind though that when you change the chip you may need to upgrade your bios to recognize the Core 2.
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