Many consumers may experience suboptimal performance from their NVMe SSDs due to limited PCIe lanes. Typically, these drives are designed to utilize four lanes (x4) for maximum speed, but configurations may inadvertently restrict them to only two lanes (x2), effectively halving their performance.
For instance, a PCIe 3.0 SSD operating at x4 can achieve throughput close to 4GB/s. However, if it is limited to x2, the performance cap drops to around 2GB/s. This reduction might not be evident during system startup or in the BIOS, making it a hidden issue for many users.
To verify the operational speed of an NVMe SSD, users can utilize a tool like CrystalDiskInfo. After installation, selecting the NVMe drive will reveal the “Transfer Mode” field, where the maximum supported configuration and current active link can be checked. If the active link indicates x2 instead of x4, this highlights the need for potential adjustments to restore optimal performance.