You figure out what your motherboard is by going into your control panel and selecting the device manager.Then you look it up on the internet and the manufacturer will specify what processors it works with.
The temperature at the CPU varies from CPU to CPU, the best thing to do is to find your CPU model at Intel or AMD (more likely) look at the specs. and should tell you the maximum temperature it can handle
The most important thing to watch is that the mhz speed of the Ram matches the cpu operating freqeuncy. Not matching them can cause erratic behaviour of the CPU
chipset and socket type
Try selecting "Opt Out" to get out of the new eBay beta style, as this has been shown to cause high CPU load in older computers.
If your talking about a video game switching to CPU is switching that person to a computer.
The CPU fan and the CPU heatsink (in liquid coolers, this would be the radiator).
you would have to look it up or else just take it apart.
YES Just look under the performance tab and you will see cpu usage.
A person can conduct a cpu stress test by using the How Does it Run website. They are able to test what a computer can and can't do, and how fast it runs.
you should on the computer
The gold arrow on a CPU typically points to the corner of a motherboard socket where it should line up. This is so the CPU is installed correctly.