Samsung 850 Pro 256 GB SSD gives bizarre benchmark using Magician

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PC-Cobbler

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I bought a Samsung 850 Pro 256 GB SSD and installed W-7 64-bit on it (this is a desktop). I installed Magician and ran benchmarks. First I set it for Maximum Reliability and was disappointed in the numbers I saw for random R/W, around 60,000. Then I changed it to Maximum Performance, but the numbers do not make any sense:
-sequential read: 1373
-sequential write: 3853
-random read: 155965
-random write: 74143

Advertised maximum sequential R/W speeds are 550/520, so what's up with the astronomical figures? And random read is about 50% larger than the maximum of 100,000. Are Samsung's benchmarks always nonsensical?
 
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PC-Cobbler

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It never occurred to me that Samsung would display the overall speed, especially given that the titles over sequential read/write are "Up to 550" and "Up to 520" and the ones over random read/write are "Up to 100,000" and "Up to 90,000." But I think you are correct. By the way, Samsung support only gave the usual answers -- update SSD firmware, update Intel RST, blah blah -- and did not mention RAPID. I thought about disabling RAPID and rerunning the benchmark, but Magician warns that a reboot is necessary after it rearranges the drive. I won't tempt fate.

P.S. I added 10% over-provisioning and and reran the benchmark:
sequential read: 5280; write: 3806
random read: 168480; write 85687

The only number not way over the limit is random write for whatever reason.
 
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