"The Samsung 840 Pro is an excellent evolutionary improvement over the company's previous-generation 830 Series SSD. The included five-year warranty underlines Samsung's confidence in their new product, and the thin 7 mm form factor makes this drive a perfect match for Ultrabooks. We see around 2% higher real-life performance if compared to the 830, making the 840 Pro the fastest SSD in our test group - tied with the OCZ Vector and the MX-DS Turbo, which uses SLC flash chips and costs twice as much. Looking at the synthetic performance section, we see superior read performance, but write speeds are lower than even some SandForce-based drives, and the OCZ Vector.
Our Steady State Performance Testing reveals that while Samsung has improved things considerably compared to the 830 Series, easily surpassing SandForce-based drives, the 840 Pro is unable to match OCZ's latest Vector SSD. Moving on to MySQL Enterprise testing, the 840 Pro doesn't shine until it's subjected to a concurrent user count of 48 and above, after which it consistently delivers slightly higher performance than most other drives, albeit a tiny bit less than the 830..."
