Understanding the use of PCI-E lanes with my CPU

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

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 turning up the volume on a slot machine help Sticking with PCIe Gen 3 is acceptable for any previous series of GPUs or accessories due to the bandwidth capabilities for gaming Looking

does it matter which gpu slot i use 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