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Interestingly, the 840 Pro provided a sequential read speed of just 499.6MB/s, slightly slower than the 830's 512.9MB/s as well as the Intel SSD 520 Series, Kingston HyperX 3K and the Crucial m4.
The SSD 840 Pro delivered Samsung's promised 450MB/s throughput in CrystalDiskMark's sequential write test, faring 11% better than the 830 and 4% worse than the Vertex 4.
Although the 840 Pro struggled in the sequential read test, it delivered significant performance gains over the 830 when measuring random 512K reads, scoring 42% faster than the 830 in addition to outpacing the SandForce-driven Kingston HyperX and Intel SSD 520 Series by a convincing margin.
The 840 Pro remained strong in the random 512K write test, crushing the old 830 by 92% and the HyperX by 44% while edging ahead of the Vertex 4 by 3%.
The 840 Pro was 7% faster than its predecessor in the random 4K-QD32 read test while also besting the HyperX and Vertex 4 by 4% and 18% margins.
The 840 Pro outpaced the 830 by 52% in CrystalDiskMark's random 4K-QD32 write test while being on par with the Crucial m4 and Vertex 4 and slipping behind the SandForce SSDs.
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