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If you have a generic desktop system, if you know the motherboard make and model number, you can look up which cpus you can use with it here:
The model of a generic desktop system's mboard is usually printed in larger characters on the surface of the mboard, often between the slots. If you can't tell the manufacturer of the mboard, search using the model number on the web to determine it's brand. If there is a Version number e.g. V x.x or Ver x.x , or a Revision number e.g. R x.x or Rev x.x , beside that model number, you need to make note of that too.
The lists often show which bios version your mboard must have at the end of each line for it to be able to use that cpu.
The blue numbers at left in the lists are the cpu part number, or the cpu box part number - the cpu with a heat sink and fan in a box. Clicking on the blue link reveals more info about the cpu.
If the list does not show which bios version your mboard must have for each cpu, then you need to go to the maker of the mboard's web site and find the supported CPU cpu list for your mboard model - the required bios version will be shown there, if that applies.
If you have a brand name system computer, we need the make and model of your computer.
However, there is usually no info, or limited info, that can be found about which cpus can be used on a brand name system's mboard, other than what was available from the brand at the time the system was made, or what cpu your model already has on it.
The specific model of a brand name system is shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.
For Dell computers, they have a Service Tag number - the specific model can be determined by using that on their site, or can often be determined there automatically by you downloading some software, if Windows is still working, on the subject computer. The Service Tag number should be on a label on the outside of the case, probably on the bottom on a laptop, often but not always on the back on a desktop, and is often also shown in the bios Setup.
For a Dell computer.....
Go here for how to find the Service tag "number":
Tell us what that is.
For a HP or Compaq computer....
Scroll down a bit.
You need to find a similar label that's on the outside of your computer somewhere.
Tell us the specific Model number - that's at the end of the first line
and the Product Number (p/n) - that's on the third line.
A brand name system's mboard may have a model number printed in larger characters on the surface of the mboard, but the mboard is usually an OEM only model with the brand name system's bios version on it - made only for brand name system builders - there is no retail model - info about it, if any, is usually only available only from brand name system web sites,
- or - it's a retail mboard model with the brand name system's bios version on it - you can't use bios updates from the mboard manufacturer's web site without risking making the mboard useless, and the brand name bios version may not support recognizing the same specific cpus the mboard manufacturer's bios versions do.