AHCI : Enable in Windows 7 / Vista

Buggsy2 said:

OCZ Technology says not to activate AHCI:

AHCI
AHCI is not official supported on OCZ SSDs and may under some circumstances affect performance, specifically during windows installation. Enabling AHCI can result in higher performance in synthetic benchmarks for SSDs and HDDs alike, but can cause hang-ups and intermittent freezes in SSDs since it allows multiple access requests to compete for a drive that is not made to address re-ordering of commands in the queue. We recommend AHCI is set to disabled in both Windows and in the BIOS.
Native Command Queuing greatly increases the performance of standard rotational drives but it has no bearing on SSDs.

They should get Intel then eh, I've been using my Intel X25 M 80GB G2 for about 10 months and haven't had one single issue; I couldn't count the number of re-installs (with 'clean all' - secure erase) I've done while working on this.


SSD / HDD : Optimize for Windows Reinstallation



Thanks for taking time to post the info though.

Buggsy2 said:

OCZ Technology says not to activate AHCI:

AHCI
AHCI is not official supported on OCZ SSDs and may under some circumstances affect performance, specifically during windows installation. Enabling AHCI can result in higher performance in synthetic benchmarks for SSDs and HDDs alike, but can cause hang-ups and intermittent freezes in SSDs since it allows multiple access requests to compete for a drive that is not made to address re-ordering of commands in the queue. We recommend AHCI is set to disabled in both Windows and in the BIOS.
Native Command Queuing greatly increases the performance of standard rotational drives but it has no bearing on SSDs.

The address "res_old" makes me wonder just how old this article is.

Can you post the address that it originated from?

This is for early editions of their SSDs.

Edit:
From the OCZ support site,
If using an Intel chipset based system please use the newest Intel chipset drivers for Vertex LE, vertex2 and Agility2

For now its important you use the Intel chipset driver for ahci mode.

This is for the gen2 versions, with FW updates AHCI should be the best way to go on all OCZ SSDs.

And this from 'Official Staff':

I see arguments and conflicting advice...so lets settle the debate here in this thread before i write a new guide.

At this time when I test a system i do the following tweaks and NOTHING ELSE..

1) I check the board is in AHCI mode, if no option is available there is nothing you can do.

... (see the link for more)

The SSD forum here has got cross saturation from the gen1 forum where tweaks were needed. Vertex, Agility, Turbo and Summit are all what we call Gen2 and do not need tweaking at all. On the most part win7 in AHCI mode will do all the tweak you need for single disk operation all by its self...it looks like people on the whole have forgotten that part.

Please, take care to post accurate information, we don't want to give the wrong guidance to other viewers.

Hello dengland, welcome to Seven Forums; glad we could be a help.

Hello bearcave, welcome to Seven Forums!





If the value in the registry was at ' 0 ' to start with, AHCI was already enabled in Windows.

bearcave said:

Bare Foot Kid said:

Hello bearcave, welcome to Seven Forums!





If the value in the registry was at ' 0 ' to start with, AHCI was already enabled in Windows.

That's what I had figured,

but why then would it just continually reboot when I set it to AHCI mode in the bios?

Something is out of order, if it's not/wasn't set in the BIOS to AHCI, Windows automatically disables the AHCI drivers during OS install.
Do you have a lot of data to lose if you re-install; just asking.



These are the wrong ones, as far as I know; I haven't used this technology.

Matrix Storage manager" and "Rapid Storage Technologies"