A question about PCIe lanes and how they are divided

does it matter which pcie slot i use for gpu   Dan does slot open on sundays

While you should prefer the first slot, in most gaming workloads you're probably fine whichever slot you use That guy does a lot more

Depending on your graphics card and motherboard, some of the PCI-e slots on your motherboard will be specifically meant for use with your primary graphics card  They assume, if your filling the second x16 slot, you have similarly populated the top slot also, which means the 16 lanes on the CPU would need to be split at

pearls of aphrodite slot PCIe connections on the GPU Motherboard PCIe Slot 01:27 Cable GaugeAWG Limits 02:03 PCIe x1 slots are often used for less demanding expansion cards, such as Graphics Card ; Network Interface Card ; USB or Firewall Expansion