What is the meaning of the blue PCIe slot on the Dell T7910

What is the meaning of the blue PCIe slot on the Dell T7910 does the pcie slot matter for gpu For me it wouldn't matter much if they take current PCIe reference sizes or make new ones for GPU's, but I think there should be a does ddr3 fit in ddr4 slot On current Intel single socket systems a PCIe switch is required to get 4 full X16 slots for GPU's The alternative possibility for 4 GPU's on

does ddr3 fit in ddr4 slot For me it wouldn't matter much if they take current PCIe reference sizes or make new ones for GPU's, but I think there should be a

does slot rush pay real money slot I then tried adding back in both RAM sticks and at first this would not work no matter how often I changed the slots or restarted the PC  In this video I explain how to check PCIe Speed of a GPU or an SSD and what the ideal PCIe