SSD performance degraded after installed Intel RST???

[ziggie216]

I was trying to optimize Win 7 w/ SSD and read some where that the Intel drivers are better than what MS released. Tried it out by installing latest Intel RST and Intel SSD toolbox

Before drivers update
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CrystalDiskMark 3.0 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 252.578 MB/s
Sequential Write : 107.767 MB/s
Random Read 512KB : 185.665 MB/s
Random Write 512KB : 108.688 MB/s
Random Read 4KB (QD=1) : 12.946 MB/s [ 3160.7 IOPS]
Random Write 4KB (QD=1) : 18.687 MB/s [ 4562.3 IOPS]
Random Read 4KB (QD=32) : 150.712 MB/s [ 36794.8 IOPS]
Random Write 4KB (QD=32) : 84.651 MB/s [ 20666.7 IOPS]

Test : 1000 MB [C: 47.2% (27.8/58.8 GB)] (x5)
Date : 2010/05/23 22:09:04
OS : Windows 7 [6.1 Build 7600] (x64)

After driver update
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CrystalDiskMark 3.0 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 252.578 MB/s
Sequential Write : 78.840 MB/s
Random Read 512KB : 185.850 MB/s
Random Write 512KB : 79.872 MB/s
Random Read 4KB (QD=1) : 14.520 MB/s [ 3545.0 IOPS]
Random Write 4KB (QD=1) : 3.585 MB/s [ 875.3 IOPS]
Random Read 4KB (QD=32) : 154.773 MB/s [ 37786.4 IOPS]
Random Write 4KB (QD=32) : 4.100 MB/s [ 1001.0 IOPS]

Test : 1000 MB [C: 47.4% (27.9/58.8 GB)] (x5)
Date : 2010/05/23 23:04:54
OS : Windows 7 [6.1 Build 7600] (x64)


Write performance had a significant impact, unless I'm this info wrong. Any idea what happened here?