Why some people say that the video card is not plugged into the motherboard with an extension cable can Some people say that it must be plugged into the motherboard

You said do not know is a desktop or laptop, in general: now many ultra-thin laptop with a dedicated USB and special power supply port of the external CD-ROM drive wiring, and the external CD-ROM drive integrated high-definition graphics card function, embedded in the high-definition graphics card on the board. Then this connection is a matching connection, and can be and what you said extension cable to connect, but in general USB or high-speed interface and power supply port are very special, so the extension cable if the original production has, then also be able to play a role, if the messy connection will cause accidents. Then come back to the desktop matching PCI extension cable, generally this cable is rare, in the production of motherboards in the factory is able to see, they can also be called professional flywire. Its call is actually no more standard call, can also be said to be a test line, then this line can be external graphics card, but the graphics card itself is made to plug in the motherboard for a combination of the efficacy of the card, if the use of the joint line external, in fact, it is not impossible, but just think it is very strange, before Lenovo has also done a kind of external connection to the way of the CPU, the chassis can be external to the CPU, greatly improving the heat dissipation, and indeed Not the so-called water-cooling system of the external, but absolutely developed to the external mode, generally for government agencies and hospitals medical long time work of the important equipment and production, but now it is also not good to see, so that a lot of equipment can be connected outside the motherboard 。。。。 The way it works and the mode can be forced unusual changes, but does not affect its own function and performance of the play, I hope to be able to help you!