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Slow write speeds with Corsair Pro 256 GB

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Hi guys. This is my first post.

I have set BIOS to AHCI, but still getting slow write speeds.

I'm using Windows 7 Home Premium

Drive: Corsair Pro 256GB

Computer Specs: RAM: 16GB; Motherboard: ASUS P8B75-M

Processor: Intel i7 3770

Results are as follows using CrystalDiskMark 3.0.2 X64

5 1000MB C: 39% (94/238GB)

Seq Read: 489.6 Write: 65.10

512K Read: 374.6 Write: 61.75

4K Read 31.19 Write: 3.089

4K QD32 Read: 280.5 Write: 36.99


I have tweaked the OS a fair bit, but nothing has worked. I haven't changed settings in BIOS for C1 stepping etc. I figured there was a problem that needed fixing first if my read speeds are so slow.

Please let me know if there is more info you need and anything I can do.



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I have used a program to update all my drivers. As far as I am aware, I have the latest drivers for all my hardware. I also disabled any power saving features in the BIOS. There has been no change in the results. Tomorrow I will purchase another SATA 3 cable and see if there is any difference.
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Looks like a BIOS-Bug to me. Your read-rates are overall alright, but your write-rates are pretty messed up overall.


1. Could be a damaged cable indeed


2. See if ASUS got newer UEFI/BIOS, if yes upgrade.


3. Try the SSD on another mashine, when write-rates are still messed up you have to RMA the drive, if it is ok, then you have to refer to ASUS-Support to get a new UEFI/BIOS.


4. Another possible reason could be your HDD interferring somehow, so try to unplug that and repeat benchmark.

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Hi. I discovered that when I updated the BIOS the AHCI setting changed to IDE by default. Therefore when I ran the last ATTO benchmark I did so with IDE set in BIOS instead of AHCI. I have now changed it back to AHCI and I have better results with my SSD (Corsair Pro 256GB). I think the results are pretty normal now. Please check them out and tell me what you think.



Final #2.pdf

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