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Old 10-18-09   #1 (permalink)
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Default AHCI or IDE...what's the difference?
i'm about to reinstall my OS because i really screwed things up, and this time i was looking into using ACHI because i heard it improved performance...is this true?

what is the difference between setting my BIOS to AHCI vs IDE?

what are the advantages and disadvantages of using AHCI?

also my BIOS allows me to set SATA ports1-4 and 5-6 differently, except i only have 5 onboard SATA ports?

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Old 10-18-09   #2 (permalink)
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AHCI allows for Native Command Queing and Hot Swapping, if your drives allow it. Most SATA drives can be hot swapped, but not all of them have NAQ as a function.

Therefore, if your drives allow for NAQ, then you might see a marginal performance gain. If they don't then the only reason to use AHCI is for hot swapping, which may not matter to you at all.

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Old 10-19-09   #3 (permalink)
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except i only have 5 onboard SATA ports?
It's your eSATA port.


Most of the time AHCI will improve system performance. You can check out this great AHCI vs IDE test if you want specifics.

This about sums it up.....

Quote:
These extensive benchmarks clearly show to us, AHCI (NCQ) definitely could improve computer system responsiveness, transfer rate, number of IO per second and the list goes on.
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Old 10-19-09   #4 (permalink)
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.. and ports 5 and 6 are on a different SATA controller.
..a
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Old 10-19-09   #5 (permalink)
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Originally Posted by grishkathefool View Post
AHCI allows for Native Command Queing and Hot Swapping, if your drives allow it. Most SATA drives can be hot swapped, but not all of them have NAQ as a function.

Therefore, if your drives allow for NAQ, then you might see a marginal performance gain. If they don't then the only reason to use AHCI is for hot swapping, which may not matter to you at all.
NCQ does nothing or hurts desktop performance due the overhead . NCQ benefits truely random access like in servers with multiple users.
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Old 10-19-09   #6 (permalink)
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NCQ does nothing or hurts desktop performance due the overhead . NCQ benefits truely random access like in servers with multiple users.
Are you saying the tests in my link do not translate into a performance increase for a deskktop user?
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Old 10-19-09   #7 (permalink)
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Are you saying the tests in my link do not translate into a performance increase for a deskktop user?
Linked is blocked at work.

NCQ does not improve desktop performance. A single users HD access pattern is still too linear for the added overhead.
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Old 10-19-09   #8 (permalink)
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Well then...Get Back to Work!
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Old 10-19-09   #9 (permalink)
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Well then...Get Back to Work!
Reports are running.... awaiting results.... always waiting for code completion.

(hence my post count)
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Old 10-19-09   #10 (permalink)
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Quote:
Originally Posted by DuckieHo View Post
NCQ does nothing or hurts desktop performance due the overhead . NCQ benefits truely random access like in servers with multiple users.
Okay, Duckie, I should have put the word MIGHT in bold and italics... that was the general point I think I was trying to make, though. However, there is still the benefit of hot swapping, assuming that the OP needs to do this for some reason, right? I mean, lets say you have several different media drives...?

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