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Windows 7: Speed difference going from AHCI to IDE

19 Dec 2010   #1

Windows 7x64 Home Premium SP1
Speed difference going from AHCI to IDE

I had some reason for moving from Sata mode AHCI to IDE (Reason in this thread)
Most material I read didn't have any compelling speed disadvantage so I did some informal speed tests. Results for those interested (This not an SSD):
CrystalDiskMark speed tests don't show any significant difference.
The first row is a sequential 1GB R/W test. Next rows are various random R/W tests.

Name:  ahci speed.JPG
Views: 26
Size:  69.1 KBName:  ide speed.JPG
Views: 25
Size:  68.8 KB

A four thread unindexed search for a text string in
1,164 pdfs (1.7GB)
from 253,302 files (173GB)
Took: 2min 12 secs for AHCI and 2min 5 secs for IDE

Informal conclusion: No significant speed difference.

Add: In addition to specs listed. Seagate 1TB (ST31000528AS), AMI BIOS.

My System SpecsSystem Spec
19 Dec 2010   #2
Microsoft MVP

Windows 7 Ult. x64

Compelling indeed. Do you think the resuts might be different for varying brands of SSD?
My System SpecsSystem Spec
19 Dec 2010   #3

win 7 ( 64 bit)

i think the AHCI advantage is for ssd's drives.
My System SpecsSystem Spec

19 Dec 2010   #4
Microsoft MVP

Windows 7 Ult. x64

Quote   Quote: Originally Posted by scrooge View Post
i think the AHCI advantage is for ssd's drives.
Ahh, my bad
My System SpecsSystem Spec
19 Dec 2010   #5

Windows 10 Pro

If you read here.... Reason in this thread you'll note the OP isn't using an SSD drive.

Quote   Quote: Originally Posted by GeneO View Post
Does IDE support TRIM for your SSD? I would think that important.
Quote   Quote: Originally Posted by mjf View Post
I'm not running an SSD so is trim important?
My System SpecsSystem Spec
20 Dec 2010   #6

Windows 7x64 Home Premium SP1

I was able to run sata mode AHCI enabled in the BIOS after making the msahci registry change and driver change due to my Nvidia nForce board. But no speed improvements for a conventional HDD.
Name:  ahci speed2.JPG
Views: 11
Size:  49.4 KB
But still had a problem with Hirens boot disk running mini XP not recognising the sata drive. Probably due to the Nvidia board.
So I'm staying with the IDE mode setting for now.

My System SpecsSystem Spec
20 Dec 2010   #7

Windows 10 Pro (x64)

Does the board and drives use SATA 2 or greater? Your benchmarking misses one important benefit of SATA using AHCI and that is Native Command Queuing. Native Command Queuing - Wikipedia, the free encyclopedia
My System SpecsSystem Spec
20 Dec 2010   #8

Windows 7x64 Home Premium SP1

I've seen reference to the NCQ and the Wikipedia article represents the depth (or lack of) my knowledge. The last 4 rows in the speed test tables are various size random R/Ws. I might have thought this NCQ effect in terms of performance imrovement would have shown up here?

My BIOS has been previous set to AHCI since I owned the PC (default setting).
It is only that I want to boot to the Hirens (12.0) boot CD/USB using mini XP that I've changed the setting.
My System SpecsSystem Spec

 Speed difference going from AHCI to IDE

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