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Windows 7: Questions about AHCI and SSD

27 Apr 2010   #1

W7 Prof 64 bit
 
 
Questions about AHCI and SSD

I don't understand what AHCI is use for, could someone elaborate on this.

Do I need AHCI with an SSD and why?
I don't want to run a Raid setup.
I have 6 Sata II Seagate drives now so will AHCI screw them up if needed for the SSD?

Thanks much.

My System SpecsSystem Spec
27 Apr 2010   #2

Windows 7 Professional x64
 
 

Read this article on AHCI: Advanced Host Controller Interface - Wikipedia, the free encyclopedia

Also see this tutorial: AHCI : Enable in Windows 7 / Vista

I imagine the SSD will run a lot faster with AHCI than IDE (non-RAID).
My System SpecsSystem Spec
27 Apr 2010   #3

Windows 7 Ultimate x64
 
 

The 2 primary advantages from AHCI are hot swapping (which is advantageous on eSATA drives) and NCQ (native command queueing).

As far as performance goes, with my SSD on AHCI I see maybe a 10% performance increase at most. My random write 4k benchmark increased substantially when I went to AHCI.

Your other hard drives should be find...provided they aren't bootable drives with operating systems installed.

And finally, you don't need to run AHCI if you have an SSD drive. SSD's will run just fine under IDE mode.
My System SpecsSystem Spec
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27 Apr 2010   #4

Windows 7 Professional x64
 
 

I see almost no improvement using AHCI with my SSD (about 3-4%) and I have tried both extensively. Also, Patriot (the brand SSD I have) has recommended I use IDE because firmware updates and performance restore tools Patriot has do not work well with AHCI. Hope that helps.
My System SpecsSystem Spec
28 Apr 2010   #5

W7 Prof 64 bit
 
 

Thanks everyone!
My System SpecsSystem Spec
28 Apr 2010   #6

Windows 7 Ultimate (x64) SP1
 
 

Quote   Quote: Originally Posted by Jonathan_King View Post
I imagine the SSD will run a lot faster with AHCI than IDE (non-RAID).
Not the case for me. As I posted in the SSD Performance thread, the speed increase was minuscule. I reverted back to IDE mode because with AHCI enabled, boot time increased by nearly 10 seconds.
My System SpecsSystem Spec
28 Apr 2010   #7

W7 Prof 64 bit
 
 

Forgot to ask is there a hard drive utility program to copy files from a standard hard drive onto the SSD drive?

I should state that I have used CopyWipe for cloning drives. It's extremely fast and reliable.
I have used this for cloning the 'c' drive and it worked every time. It gets everything.
However I don't this it works with SSD's. I will send the developer an email asking.
My System SpecsSystem Spec
28 Apr 2010   #8

Windows 7 Ultimate (x64) SP1
 
 

You don't need a program to copy files from a HDD to a SSD. Just copy as usual
My System SpecsSystem Spec
28 Apr 2010   #9

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by tw33k View Post
Not the case for me. As I posted in the SSD Performance thread, the speed increase was minuscule. I reverted back to IDE mode because with AHCI enabled, boot time increased by nearly 10 seconds.
Yeah, that was the case for my. On my gigabyte GA-ep45-ud3r with the F9 bios, turning on AHCI introduced an 8 second delay at boot. With an upgrade to the F12 bios, that delay dropped to under 2 seconds. But I wasn't willing to give up 8 seconds at each boot for such a miscule performance increase.
My System SpecsSystem Spec
28 Apr 2010   #10

Windows 7 Ultimate (x64) SP1
 
 

Me either. I'm sticking with IDE mode.
My System SpecsSystem Spec
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