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Odd 4k Read/Writes with Intel 520SSD in RAID0

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July 9, 2013 3:33:37 PM

Setup:
4670k Haswell @ 4.6GHz
Gigabyte GA-Z87MX-D3H
16GB DDR3 2400
2x Intel 520 60GB SSDs in a 16k RAID0 Stipe (Write-cache buffer flushing Disabled, Cache Mode Write back)

I have the newest drivers for everything (newest firmware for the Intel SSDs). Newest RAID and RST Drivers.


This is after about a week on a fresh install of Windows 8:


This is my other PC (AMD FX8150, Gigabyte 990FXA-UD7, OCZ Vertex 3 120GB, single drive)


Why are the 4k Read/Writes on my slower single Vertex 3 much faster than my Intel 520SSDs in RAID0? Same goes for the 4k QD32 Read speed? Any ideas?

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July 9, 2013 3:46:33 PM

Casey Williams said:
Setup:
4670k Haswell @ 4.6GHz
Gigabyte GA-Z87MX-D3H
16GB DDR3 2400
2x Intel 520 60GB SSDs in a 16k RAID0 Stipe (Write-cache buffer flushing Disabled, Cache Mode Write back)

I have the newest drivers for everything (newest firmware for the Intel SSDs). Newest RAID and RST Drivers.
<snip'd>

Why are the 4k Read/Writes on my slower single Vertex 3 much faster than my Intel 520SSDs in RAID0? Same goes for the 4k QD32 Read speed? Any ideas?


All I can do at the moment is provide my own data point (Z68 chipset, 2x Vertex 3 120GB)

Honestly, your speeds look about right, for whatever reasons, the increased latency from going through the RAID controller seems to make the 4K read/writes slower.

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