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Old 01-11-08, 07:43 PM   #1
ATOJAR
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Default IDE vs AHCI

So i have just enabled AHCI in the bios, i heard that its supposed to increase performance of the HDD! is this correct? is it better to have AHCI enabled instead of IDE?

I heard that if you try to enable it while you already have it set to IDE and already have the OS installed it gives a BSOD on reeboot! .... however i followed this little trick >> http://support.microsoft.com/kb/922976

All seems to be running fine! ... but as said is it actually better\faster set to AHCI? ... how many people are using the AHCI setting?
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Old 01-11-08, 08:37 PM   #2
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Default Re: IDE vs AHCI

just a word of warning, most sata optical drives hate AHCI.
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Old 01-12-08, 04:59 AM   #3
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Default Re: IDE vs AHCI

Hmmmm ..... it seems to bne running ok!

So you its best not to have it set to AHCI?

Im going to run HD Tune to see if theres any difference.
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Old 01-12-08, 05:25 AM   #4
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Default Re: IDE vs AHCI

Check cpu usage during long disk transfers. AHCI has some cool features to improve performance, lower the cpu usage, save energy, support huge hdds, hot swap, ...
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Old 01-12-08, 07:15 PM   #5
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Default Re: IDE vs AHCI

Well i decided to try alittle test using HD Tune, i defragged and re-booted before each test, heres the results

Set to IDE.



Set to AHCI.



As you can see there is a slight perfroramce increase, ive been running with AHCI enabled now for over 2 days without any issues what so ever, ill leave it like this unless i come across any issues.

By the way notice how the burst rate in AHCI mode had dropped quite alot, is this a good or bad thing? what does this mean?
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Old 02-06-08, 11:40 PM   #6
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Default Re: IDE vs AHCI

I changed over to AHCI and saw no performance increase at all. It actually seems a bit slower. From what I've seen on my own system and read, AHCI only benefits a SATA hard drive that has NCQ (and most of them don't). Also, you have to use a third party program (Intel Matrix Storage Manager) to view the settings as they are not in Device Manager anymore. I also saw that some benchmark programs like SisoftSandra report some oddities in some of the stats. Seems some benchmarking programs don't communicate well with the Intel Matrix Storage Manager.

I'm seriously thinking of going back to the Windows IDE setup. Thankfully, going from AHCI to IDE is easier than going IDE to AHCI (without re-installing OS). When I went from IDE to ACHI (without re-installing OS), it was a bit of work.

There is a lot written and a lot of disputes if AHCI, even with NCQ, is actually showing tangible increases in benchmarks and every day use in a desktop environment vs just straight IDE. A lot of this stuff (feeling of speed increases) is really more subjective than objective. The day when we see true solid state hard drives (with no moving parts) in the mainstream is when we will really be seeing a big speed increase as the hard drive is the slowest component (by far) in the computer.
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