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I would copy the cpu pic to cllipboard by selecting the entire image and pressing ctrl + c.

Then in your psd template click on in the layers panel the insert image layer thumbnail icon (the left one of the two icons) while holding ctrl - this will select that layer.

In the edit menu find "Paste Special" and click paste into.

Then hit ctrl + t to transform the cpu image that you pasted into something you like. You will be able to reposition the cpu pic with the move tool inside the box.

You may or may not want to get rid of the triangle separator layer.