A display device of an addin card generally includes, in structure, an addin card, a display device, a control board, and control software. The addin card is in information connection with the display device and the control board. The control software is loaded in the control board and is in information connection with the addin card. The display device access and reads hardware status data of the addin card, such as an operation temperature, a fan rotational speed, and a processing frequency. As such, in an attempt to observe the current hardware status data of the addin card, a user is allowed to make direct observation of the data on the display device without activating the control software. To change the operation performance of the addin card, the user may operate the control software to control the addin card, without entering BIOS, this being very convenient for the user.
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