SSD - Normal Read Speed but Slow Write Speed

I have a GA-Z68X-UD3-B3 board with a 2500k Intel processor coupled up with 2 x 64GB SSD Crucial SSD's.

One reads and writes fine being the M225 64gb SSD (I use this one for my flight sim x drive)

However the Crucial C300 SSD (my C: windows 7 64bit drive) reads at a similar speed, but the write speeds are well below I will post more details when I go home from work at 5.

I have changed from IDE to AHCI by registry tweaking inside the regedit. It installed the AHCI drivers when I rebooted and enabled Ahci within the Bios settings.

I don't understand why the two are differing so much on their write speeds.

Any thoughts or suggestions, downloaded relevant drivers for the mobo and installed, any other settings in bios may need changing? Thanks.

Worked it out - The setting for my SATA 3 two connectors that the SSD's were connected to was IDE not AHCI!

Edited by benbird7 (Mon 26-Mar-12 17:26:42)

Just ran tests on both drives now, I note that the system disk (M225) is not aligned correctly but I don't think it warrants a reinstall of windows.

M225 Disk

Sequential Read : 186.278 MB/s
Sequential Write : 98.427 MB/s
Random Read 512KB : 152.268 MB/s
Random Write 512KB : 93.486 MB/s
Random Read 4KB (QD=1) : 24.737 MB/s [ 6039.2 IOPS]
Random Write 4KB (QD=1) : 7.748 MB/s [ 1891.6 IOPS]
Random Read 4KB (QD=32) : 62.787 MB/s [ 15328.8 IOPS]
Random Write 4KB (QD=32) : 8.677 MB/s [ 2118.5 IOPS]

Test : 100 MB [C: 63.9% (38.1/59.6 GB)] (x2)
Date : 2012/03/26 17:58:36
OS : Windows 7 SP1 [6.1 Build 7601] (x64)


C300 Disk

Sequential Read : 340.281 MB/s
Sequential Write : 71.565 MB/s
Random Read 512KB : 320.495 MB/s
Random Write 512KB : 71.545 MB/s
Random Read 4KB (QD=1) : 27.007 MB/s [ 6593.6 IOPS]
Random Write 4KB (QD=1) : 48.395 MB/s [ 11815.3 IOPS]
Random Read 4KB (QD=32) : 126.531 MB/s [ 30891.3 IOPS]
Random Write 4KB (QD=32) : 71.368 MB/s [ 17423.8 IOPS]

Test : 100 MB B: 94.1% (56.1/59.6 GB)] (x2)
Date : 2012/03/26 18:01:36
OS : Windows 7 SP1 [6.1 Build 7601] (x64)