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Why is this happening? it should be PCIe3.0x16, I plugged it into the right slot. It shows this in the bios, cpu-z and gpu-z, My graphics card is a Galaxy Nvidia GTX 670, Processor is i7-3770k
There is no specific reason for this behavior to occur reason why we recommend testing with a different GPU to ensure this is not a compatibility issue with the card itself and test the system with a different power supply out of the chassis.