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I just installed Windows 7 Ultimate 64-bit to a new Samsung 850 Pro 256 GB SSD on a system with an Asus Sabertooth P67 motherboard and 16 GB of RAM. The drive is plugged into a 6 Gbps Intel port and the UEFI is set to AHCI for the Intel SATA ports. Windows is up to date and the Intel drivers are all the latest drivers that I can find, although the SATA AHCI Controller driver is version 10.5.0.1026 from 4/26/2011 as it was downloaded from Asus and I could not find a more recent driver from Intel.

Here are the Samsung Magician benchmark results: enter image description here Note that I have performed the disk and OS optimizations.

I could live with the sequential speeds, but the IOPS are just pathetic compared the drive's capability. I do have TrueCrypt 7.1a with full disk encryption, but given that the system has hardware AES, TrueCrypt reports throughput benchmark of 3.4 Gbps, so I'm not clear that this would affect anything.

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  • What do you expect the numbers to me? Have you consulted the OS optimization section of Magician? – Ramhound Sep 11 '16 at 19:00
  • @Ramhound Something better than 8% or 18% of capacity? I stated in the question that OS and disk optimization has already been performed. – Paul Sep 11 '16 at 19:01
  • TrueCrypt comes at a cost: IO is serialized. This is, what you see in the RIOPS, where parallel execution is much more of an issue than with sequential speeds. – Eugen Rieck Sep 11 '16 at 19:04
  • @EugenRieck Do you have any links to explain this? – Paul Sep 11 '16 at 19:06
  • Many things influence performance, especially in a system using encryption. This may help explain some security.stackexchange.com/questions/61089/… – acejavelin Sep 11 '16 at 19:12

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