What on a pc can't be upgraded

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It's not that of a strict and "Must obey" rule actually it's stupid to think that,

Everything in a PC is upgradeable, some are easier to upgrade while some are harder ones and some require another upgrade before doing the update, if you know what I mean.

In the case of the motherboard its the part which has all the components held onto itself so it depends how far is the upgrade it could be (In older days) that harddrives won't work with a newer mb (IDE >>> SATA) and incase of RAM (DDR2>>DDR3) and so on but the most important thing on the motherboard is the processor itself, as long as the Processor is compatible...
with pc it depends on the age of the pc and how old it is. a 10 year old pc or more wont be able to use newer parts out there and it not worth the upgrade. at some point you wont be able ot get parts for older pc or those parts will cost more then a newer pc. motherboards and cpu chips are made for each other. if you look at any mb online there a ram and cpu guild for know tested parts. with today cpu and mb dropping every 12-18 months there not made most times to swap. haswell cpu has 1150 pins the skylake has 1151. that extra one pin wont let haswell mb run a skylake cpu.
 
What you probably heard was that you could never upgrade only the motherboard. Even that isn't really true since you can usually find a better motherboard that uses the same processor and RAM but you can't upgrade a motherboard across generations of system, i.e. you can't upgrade to an Intel motherboard if you have an AMD processor or vice versa, and you can't upgrade a motherboard from DDR2 RAM to one that uses DDR3 RAM and use the DDR2 RAM from the old one in the new one.

Generally speaking it is best to upgrade the motherboard, RAM, and CPU all at the same time.
 


It's not that of a strict and "Must obey" rule actually it's stupid to think that,

Everything in a PC is upgradeable, some are easier to upgrade while some are harder ones and some require another upgrade before doing the update, if you know what I mean.

In the case of the motherboard its the part which has all the components held onto itself so it depends how far is the upgrade it could be (In older days) that harddrives won't work with a newer mb (IDE >>> SATA) and incase of RAM (DDR2>>DDR3) and so on but the most important thing on the motherboard is the processor itself, as long as the Processor is compatible with it.

Nowadays usually 2 things go together Motherboard and Prcoessor upgrading the motherboard to a newer platform you also need to upgrade the processor aswell and vice versa but the 3rd Determinant here is the RAM which has been coming in 4 alterations now but currently on the Market you will find DDR3 and DDR4 only, 1st gen - 4th gen use DDR3 and 5th gen was able to use both (depending on mb), while 6th gen uses DDR4 and some other 6th gen motherboards were able to use ddr3 but not ddr4.

"However, replacing your computer’s motherboard or CPU will likely be so big a change that it prevents the PC from automatically activating. Windows 10 will see it as a different hardware configuration, one which isn’t allowed to have the free upgrade.

If you run into this problem, you should just be able to clean-install Windows 10 normally. Skip both prompts when you’re asked to enter a product key. After it installs, it will attempt to activate itself with Microsoft and won’t automatically activate. It will be considered non-genuine until you activate it. The activation screen will prompt you to purchase a new license from the Windows Store.

According to Gabriel Aul, Vice President of Engineering for the Windows & Devices group at Microsoft, you can then contact support from within Windows 10, explain the situation, and they’ll activate Windows 10 for you."


the passage in Italics was taken from here
 
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