240 GB benchmarking at half speed

Internal SSD All Other Internal SSD
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I don’t know what you are talking about. The write speed looks perfect for an SSD that has been used some days.

Other get nearly the same results, see last post in the thread I linked in my first post: 

http://forums.sandisk.com/t5/SanDisk-Extreme-SSD/Sandisk-Extreme-240GB-Benching-slow-Win-7-Asus-P8Z68-V-Pro/td-p/278556 

The write speed is always slower that read speed.