As with all of our tests, the following tests were performed after a secure erase of the drive. The drive was also conditioned with a predefined workload until it reached steady state. We also test across the entire span of the drive.
For sequential operations, both the S3500 and SM843 are pretty evenly matched. The S3500 holds a slight lead for writes, while the SM843 wins for reads. Neither drive really separates itself from the other. What was fun was putting four 480GB S3500s on an LSI HBA. With a simple software RAID, we were able to get over 1200 and 1800MB/s for sequential read/write operations, respectively.
Random 4KB reads and writes were the exact opposite of sequential operations. The SM843 holds a slight lead for write operations while the S3500 pulls away in random 4KB reads. On the flip side, it took four S3500s to match a single S3700 for random 4KB writes. Those same 4 drives had no problem posting nearly 300K read IOPS.