A computer with a dual-core processor (one processor with two cores) and a computer with a dual processor (two separate physical processors) will perform largely the same. However, there are some differences. For example, a computer with a dual-core processor puts a lot more stress on the processor. Depending on what you are using your computer for, you may want to know whether you have a dual-core processor or a dual processor. This is relatively easy to find out.
Right click on "My Computer" or "Computer." The icon can be found on your desktop or by clicking "Start."
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Click "Properties" from the drop-down menu.
Scroll down the properties window until you get to the heading "System."
Look under the "System" heading to where it says "Processor." Next to processor, you will see the name of the processor you have. If it says "dual processor," this means you have two processors. If it says "dual core," this means you have a dual-core processor.
Turn on your computer and wait for the "Finder" window to pop up.
Choose "About This Mac" from the Apple menu.
Look at the Processor line to see which kind of processor you have. If it says "dual processor," this means you have two processors. If it says "dual core" or "dual-core processor," this means you have a dual-core processor.