Stefan Mileschin

OWC this week introduced its second-generation ThunderBlade external SSDs, which are aimed squarely at the high-end, max performance external storage market. Offering up to 2800 MB/s sequential read speeds, the new drives offer the same performance as the first-generation ThunderBlade SSDs, but are priced significantly lower.

OWC’s ThunderBlade (Gen 2) DAS devices are available in 1 TB, 2 TB, 4 TB and 8 TB configurations, just like their predecessors. While the first-generation ThunderBlade drives were based on four Mercury M.2 SSDs (Silicon Motion SM2260, LDPC, 3D MLC NAND) working in concert, the ThunderBlade (Gen 2) devices use cheaper SSDs, almost certainly featuring modern 3D TLC NAND. Since 3D TLC is cheaper than 3D MLC, the ThunderBlade Gen 2 drives start at $799, down from $1,199 in case of the first-gen.

Performance-wise, the new and "old" ThunderBlades offer the same official specs: both generations are rated for up to 2800 MB/s sequential read speed as well as up to 2450 MB/s sequential write speed (keeping in mind performance levels offered by four PCIe 3.0 x4 SSDs, these must be sustained speeds). Meanwhile, when two ThunderBlade (Gen 2) drives are used and SoftRAID technology is enabled, performance levels go all the way up to 3800 MB/s, which is the maximum performance level offered by one PCIe 3.0 x4-based ThunderBolt 3 controller. Speaking of TB3, it should be noted that the latest ThunderBlade is still based on Intel's DSL6540 "Alpine Ridge" controller, so there's no USB fallback here.

https://www.anandtech.com/show/13928...0-mbs-from-799