What does 4x mode mean

racerzx

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Aug 19, 2017
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I have a Asus m5a97 r2.0 motherboard and recently found out that on the black PCI express slot there is something called 4x mode. Does anyone know what that means?
 
Solution
That just means that that slot has 4 pcie lanes. So anything in that slot will run with x4 bandwidth. Nvme ssds are x4. Graphics cards are x16.