No, it's not possible to use a PCIe 4.0 NVME SSD in a device with only PCIe 3.0 support.
No, it's not possible to use a PCIe 4.0 NVME SSD in a device with only PCIe 3.0 support.
Will it work better than the Best PCIe 3.0x4 NVMe SSD? (Perhaps a Samsung 970 EVO Plus could be an option.)
In most scenarios, performance will remain similar. However, in extreme cases, Gen 4 drives might lag slightly due to their focus on raw speed rather than overall efficiency. Actual IOPS often fall marginally behind Gen 3 models unless your workload demands more capacity. Generally, choosing a Gen 3 drive is preferable unless you need the additional bandwidth.
It might perform slightly worse, especially with the drive type. However, it will generate significantly less heat compared to PCI-E 4.0.