For the long term performance stability test, we set the drive up to run a 20-minute 4K random test with a 30% write, 70% read split, at a queue depth of 256 over the entire disk. The 2TB Samsung 970 EVO averaged 159,114 IOPS for the test with a performance stability of 87% which, for a consumer drive, is excellent – getting near to enterprise-class ratings.