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I just bought a new SSD, and installed a fresh copy of Windows on it. I didn't see any noticeable difference in boot times, app start-up times, so I decided to benchmark it.

  • Asus P7P55D-E
  • Intel i5-760
  • Samsung 830 256GB SATA III
  • Windows 7 Ultimate 64-bit

The Windows experience index gave the drive a 7.3 rating, but real-world performance is not particularly impressive.

ATTO AS SSD Samsung SSD Magician

Any ideas why the numbers are so low?


It turns out that SATA III support is turned off by default on the P7P55D motherboard. After enabling it in BIOS (Tools -> Level Up), the scores went up:

      Read  Write
Seq   325   183
4K    16    49
IOPS  32K   28K

It's an improvement, but still far below what they should be for this drive.

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What is low about these numbers? Doing random 4K IOps on a 15K RPM SAS drive yield speeds in the single digit MB/sec. Your drive benchmarks those at 12MB/sec. A order of magnitude faster. (Ignore the sequential stuff). –  Hennes Nov 29 '12 at 7:49 Go check the advertised specs for this drive. There are plenty of reviews and benchmarks that back up those numbers. And why are you comparing an SSD to a HDD? –  alekop Nov 29 '12 at 8:11
Yes, the SATA bus in AHCI mode. And the mobo supports SATA III (though these numbers are kind of slow even for SATA II). –  alekop Nov 29 '12 at 8:34
@alekop Yeah I just noticed in the screenshot you're using msachi. I agree your numbers are low for that drive, the WEI is too. –  Louis Nov 29 '12 at 8:36
How is the partition aligned? –  Hennes Nov 29 '12 at 8:41

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