Intel X25-M slow read speeds Windows 7 64bit

[idata]

I have a problem with my newly bought Intel X25-M SSDSA2MH160G2R5 160GB SSD with Intel's latest firmware 02HD.

I installed Windows 7 64bit on it using a Compaq Presario v6346ea notebook with 4GB Ram which is also updated with the latest firmware F.2D (Phoenixbios)

I've checked the speed of the Intel X25-M under 2 circumstances with CristalDiskMArk and in both cases the READ speads are way too low:

1) Sata Native Mode Disabled in BIOS (Standard AHCI 1.0 Serial ATA Controller is NOT visible in Device Manager and programs in Windows 7 reacted slow):

2) Sata Native Mode Enabled in BIOS (Standard AHCI 1.0 Serial ATA Controller is visible in Device Manager)

I also checked my registry and I found HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Services \ Msahci \ Just start already value 0

My SSD is never seen as a removable drive though which I've read seems to be the case when using AHCI

When Sata Native Mode enabled:

1st ATA Channel 0: is ATAPI Cdrom - DMA Mode 2 (DMA enabled) - drivers atapi.sys, ataport.sys

2nd ATA channel 0: ATA Disk State Mode 6 Ultra DMA (DMA enabled) - drivers atapi.sys, ataport.sys

ATA Channel 2: I see no devices

I can't seem to get the speed of the Intel X25-M any higher, no matter what tweaks I try ("Superfetch/Prefetch/Drive Indexing/Search Indexing/System Restore Points off", Write Cache on)

I haven't tried the Intel Matrix drivers yet as I have heard that they don't support automatic Trim and I've seen many other Intel X25-M users using the Windows 7 drivers with much higher CrystalDiskMark speeds, so that shouldn't be an option.

Does anyone have similar experiences or can give any advice to make the read speeds get to their expected levels?

[idata]

Something to keep in mind is that even if the chipset is capable of 3 Gb/s, the laptop BIOS may be configuring it for 1.5 Gb/s - and not exposing this as a setting you can change. One possible reason would be that it uses less power, although I've seen varying opinions on this.

[SKlin]

If I was to guess, it's the controller. It's a notebook, not a desktop. How old is the notebook? I just upgraded my desktop with an AMD 965be quad core CPU, MSI 790FX-GD70 mb etc. My speeds with the 80 gig Intel G2 are faster but my controller is a SATA II with the newest features. The question to ask is "Is my notebook faster than when I had the mechanical hard drive?"

[idata]

I was having the same problem. Turns out my motherboard has two SATA controllers, an Intel and a Gigabyte. The Intel has 6 ports and the Gigabyte has 2. My SSD was plugged into the Gigabyte, which was causing the issues. Plugging it into an Intel port immediately fixed the problem.

[SKlin]

Aluc: Your speed s are very fast!

[idata]

This is my new speed with a Raid0 setup