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Windows 7: AHCI : Enable in Windows 7 / Vista

14 May 2010   #110
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate
 
 

Quote   Quote: Originally Posted by LM2008 View Post
mine shows 3, should i change it to 0? strange thing is that my laptop has the AHCI option in the bios, but windows or the registry shows "3"


Hello LM2008.



Yes, starting at step #3 and finish what the tutorial says to do.


My System SpecsSystem Spec
15 May 2010   #111
LM2008

Windows 7 Home Premium 64bits
 
 

no AHCI drivers message appeared or asking to restart, is there anyway to verify is active?
My System SpecsSystem Spec
15 May 2010   #112
Bare Foot Kid
Microsoft MVP

W 7 64-bit Ultimate
 
 

Quote   Quote: Originally Posted by LM2008 View Post
no AHCI drivers message appeared or asking to restart, is there anyway to verify is active?


Howdy.


After you changed the registry value in step #3 did you re-start the PC and change it to "AHCI" like in step #4 below?

Quote:
4)Now you'll need to restart the PC and go into the BIOS and enable AHCI; when Windows boots up it will finish installing the AHCI drivers.
My System SpecsSystem Spec
16 May 2010   #113
LM2008

Windows 7 Home Premium 64bits
 
 

yes
My System SpecsSystem Spec
16 May 2010   #114
atlcraig

Windows 7
 
 
AHCI Performance

Just an update of what I found out about ahci performance! After I installed and got ahci working I checked for any performance change in Windows 7 hard drives. My drive performance before I changed to ahci was 5.4 and after the change it was still 5.4. I then installed a SSD as my C drive and my drive performance went from 5.4 to 7.1! If I would have known this before I started I don't think I would have changed to ahci. So my advice to anyone wanting to increase the drive performance on their system would be to go out and buy a SSD.
My System SpecsSystem Spec
17 May 2010   #115
Dave76

Microsoft Community Contributor Award Recipient

Windows 7 Ult x64 - SP1/ Windows 8 Pro x64
 
 

The WEI is not a good benchmark.

If you what a more accurate benchmark use HD Tune or Crystal Disk.

AS SSD Benchmark is a good one for SSDs.

It will also depend on the specs of the HDD and SSD. An older SATA drive may not be able to directly use some of the benefits.
A WEI of 5.4 tells me it may be an older model or have other issues. A 'Green' version uses less power and has less performance.
For the best performance get a 7200 RPM, 32 MB cache, HDD. Be sure it is SATA 2 and supports NCQ, S.M.A.R.T. and Plug and Play.

There're other benefits like NCQ Native Command Queuing, will get the data faster with less wear on the HD. Plug and Play, if you need it, ie external HD. As mentioned earlier.

The best benefit with a SSD is AHCI will enable Trim when using win7.

Some SSDs will seem to have better specs but will get lower benchmarks and WEI score due to the I/O rates.
My System SpecsSystem Spec
17 May 2010   #116
ZaLiTH

Win7 Ult x64 / Win8.1 Pro x64 / Ubuntu 14.10 x64
 
 

Quote   Quote: Originally Posted by ZaLiTH View Post
Definitely, I will.. I'll be changing my setup over the weekend, so that gives me time to figure out the finer details and do some "before and after" benchmarks. I'll post the results of that in the performance sub-forum on Monday.
And here I am quoting myself, yet again... Lol.

Anyway, I ran into a few issues with trying to switch to RAID; my BIOS won't allow me to change my boot order when RAID is enabled... Everytime I try set my DVD drive as first boot device, when I go back into my BIOS my RAID array is back at the top of the list. I figure it's either an issue with my DVD-RW using a SATA interface, my BIOS version (1.6), or in the worst case my physical BIOS chip.. Hopefully a BIOS flash to 1.7 will sort it out, I'll see tonight.
My System SpecsSystem Spec
17 May 2010   #117
atlcraig

Windows 7
 
 

Dave76

Thanks for the information, I will try the other benchmark tools you listed and see what kind of score. I have four SATA drives on my system of different ages so that may be causing the low scores.
My System SpecsSystem Spec
17 May 2010   #118
Dave76

Microsoft Community Contributor Award Recipient

Windows 7 Ult x64 - SP1/ Windows 8 Pro x64
 
 

Your welcome, run the benchmarks on the HDDs and post them on the Show us your hard drive performance thread.

And your SSD on the Show us your SSD performance thread.

You might see some performance improvement by moving your OS to the fastest HDD, or obviously to the SSD, if your running only one OS.
My System SpecsSystem Spec
18 May 2010   #119
Gu1air

Windows 7 Ultimate x64
 
 

Thank you so much for this info. After getting a Sata Dvd-Rw I was having a lot of buffer problems and I noticed that my bios was set to IDE. I changed to AHCI and Windows7 said it could not boot

I had to change back to IDE. This allowed me to boot back to windiows and checked this forum for any solution. There was my life saver information. I quickly followed this tutorial and my windows was back up and running.

Excellent info. Keep up the good work.
My System SpecsSystem Spec
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