128K Sequential Read/Write
The Samsung 840 Pro excels at sequential write workloads, and here manages to beat the Optimus and the Vector. This seems to be a clear win for the Samsung 840 Pro, but once we look at histogram reports below the picture changes.
The 128K sequential speeds reflect the maximum sequential throughput of the SSD using a realistic file size actually encountered in an enterprise scenario.
The Samsung 840 edges the Optimus by a slight margin during our sequential read testing.
The Samsung 840 Pro rides the top of the charts in the sequential write testing exhibiting one of the great strengths of the 840 Pro. Though the 840 Pro has impressive 100% write performance, below we can observe the difference with mixed workloads.
The performance of the consumer SSDs drops quickly with the introduction of a mixed workload, though the Vector manages to best the Optimus in the 50-90% range.
The 840 Pro nudges out the Optimus in sequential write performance, with 100% of I/O falling into the 60-80ms range. The Optimus delivers 95% of I/O in the same range, but 4.85% falls into the 80-100ms range, and a small amount falls in at 100-200ms. The Vector has operations as high as 600-800ms.
The Vector and 840 Pro manage to best the Optimus in performance per Watt in the 100% sequential write testing.