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IDE vs AHCI mode - big performance difference?


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#1 karlm

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Posted 05 August 2011 - 08:08 PM

So I just finished rebuilding my machine with Win7 Ultimate, SP1 and the myriad of updates (takes a long while on 512K...) and have just realised that I had my drives on IDE (legacy?) mode in the BIOS instead of AHCI. Is it worth changing it over in the BIOS and doing a repair in Win7, or is the speed difference not going to be that great? Machine seems MUCH more responsive than Vista ... Cheers.

#2 tantryl

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Posted 05 August 2011 - 08:41 PM

Repair not necessary. Small regedit is all that's required.

See hmyah: http://support.microsoft.com/kb/922976
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#3 karlm

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Posted 05 August 2011 - 09:15 PM

thanks tantryl. now you mentioned that, I'm kicking myself for forgetting it. Guess the brain is really a FIFO device after all ...

#4 Dasa

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Posted 06 August 2011 - 12:09 AM

ahci is normally faster with ssd depending on the mb controller but in my experience it may be slightly slower with hdd

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#5 GhostFaceKilla

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Posted 06 August 2011 - 11:08 AM

ahci is normally faster with ssd depending on the mb controller but in my experience it may be slightly slower with hdd



yep

AHCI for an SSD (when as a boot drive)

IDE for a HDD (when as a boot drive)

Having AHCI wont make any difference really to any HDD's that you have set as storgae when you have an SSD as a boot drive so dont worry about that anomoally. Rule of thumb still stands despite some saying that there is/isnt a difference (note that most manufacturers of SSD's suggest AHCI as well).





So I just finished rebuilding my machine with Win7 Ultimate, SP1 and the myriad of updates (takes a long while on 512K...) and have just realised that I had my drives on IDE (legacy?) mode in the BIOS instead of AHCI. Is it worth changing it over in the BIOS and doing a repair in Win7, or is the speed difference not going to be that great? Machine seems MUCH more responsive than Vista ...

Cheers.



Only if the boot drive is an SSD, otherwise leave the HDD's on IDE.

#6 robzy

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Posted 06 August 2011 - 01:12 PM

Don't you lose NCQ by not using AHCI? Does anyone actually have any benchmarks showing that AHCI negatively affects the performance of HDDs? Rob.

#7 Master_Scythe

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Posted 06 August 2011 - 10:49 PM

Don't you lose NCQ by not using AHCI?

Does anyone actually have any benchmarks showing that AHCI negatively affects the performance of HDDs?

Rob.


im +1-ing this remark. benchmarks pls, or I was under the impression you lost NCQ as well

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#8 UberPenguin

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Posted 07 August 2011 - 11:23 AM

SSD benchmark (its sata 2 but you get the idea) http://benchmarkrevi...mp;limitstart=9

Heres a HDD benchmark http://expertester.w...mark-advantage/ the results are oddly mixed

These are pretty much the first benchamarks that I found and unfortunately they are a little out of date but I think they give a decet indication of the principal
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#9 robzy

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Posted 07 August 2011 - 09:29 PM

Heres a HDD benchmark http://expertester.w...mark-advantage/ the results are oddly mixed

Funny, to me that shows (quite unequivocally) that, bar a few instances here and there, AHCI is faster. But not by much.

Rob.

#10 Dasa

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Posted 07 August 2011 - 10:35 PM

here is some quick tests i ran a while back i was focusing more on the ssd at the time though looks like i didnt take a screen shot of the hdd difference just remember that it was slightly slower
http://forums.atomic...s...st&p=577058

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#11 UberPenguin

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Posted 08 August 2011 - 10:52 AM

Heres a HDD benchmark http://expertester.w...mark-advantage/ the results are oddly mixed

Funny, to me that shows (quite unequivocally) that, bar a few instances here and there, AHCI is faster. But not by much.

Rob.


Yeah I would agree but with some drives it was slower, problems with the controller?

Anyway it is out of date and all of those companies would have new controllers by now so although it demonstrates that HDD's can loose performance it does also show that (to me) they mostly don’t.

I haven’t noticed any difference in HDD speed with ACHI - in my imagination it would decrease seek time on fragmented disks but I have no solid info to back it up. However, on my ssd the difference was in the vicinity of 50mb a sec.

Edited by UberPenguin, 08 August 2011 - 10:52 AM.

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#12 karlm

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Posted 08 August 2011 - 08:07 PM

It's interesting to note that different manufacturers have different benefits and detriments - some benefit on reads, some on writes. One weird thing though now is that I have the ability to Safely Remove Hardware/Eject all of my drives which previously only allowed me to do with USB connected devices. Just have to be careful when ejecting my usb keys ...

#13 aliali

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Posted 08 August 2011 - 11:31 PM

It's interesting to note that different manufacturers have different benefits and detriments - some benefit on reads, some on writes.
One weird thing though now is that I have the ability to Safely Remove Hardware/Eject all of my drives which previously only allowed me to do with USB connected devices. Just have to be careful when ejecting my usb keys ...

That's a function of the chipset and AHCI. Thankfully my mobo has options in the bios to enable or disable the hotswap part of it. So I can disable this function on the individual ports my permanent HDDS are connected to and only have safely remove available for the hotswap drives.
Odd thing is this is not mentioned anywhere in the manual I just discovered it when looking through the BIOS options and wondering what this "ESP" setting thing was.

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#14 feysal

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Posted 22 November 2016 - 01:09 AM

Of course AHCI faster and better in term of compatibility. Am i right? Follow this link for more information about AHCI vs IDE.


Edited by feysal, 19 March 2017 - 03:08 PM.


#15 Rybags

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Posted 22 November 2016 - 01:19 AM

Dig up a 5 year old thread then link to a pointless website.  In fact so pointless it has no popups, no dodgy software to try and trick you to install.

Just a few pages of this vs that in poorly constructed Chinglish.



#16 Xen

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Posted 29 November 2016 - 08:28 AM

Fucking necro threads, I thought Robzy was back for a bit there.






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