CPU stands for Central Processing Unit. It is the brain of a computer because it handles all the tasks that a user performs on his/her computer. All the arithmetic and logical calculations required to ...
A Graphics Processing Unit or GPU in short is used as a co-processor along with the CPU for heavy tasks and computing. Generally, GPUs are used to accelerate or speed up memory-intensive tasks such as ...
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You could be buying the wrong GPU

Don't waste your money (and power).