I've just received a new 990 Pro 4TB and went to test it against my existing 970 Pro 1TB.

I'm using Samsung Magician 8.0 with the latest firmware for both drives. Both drives are in a PCIe Gen 3 x4 slot.

I'm not expecting ground-breaking sequential throughput as I'm using PCIe Gen 3, but Samsung Magician is reporting oddly low IOPS for the 990 Pro.

I also tested using CrystalDiskMark (C: is the 970 Pro, Z: is the 990 Pro) - This shows the drives as being comparable on my system.

Is Samsung Magician incorrect or have I received a bad 990 Pro?