Enabling AHCI on P55A-G55 (and SSD only getting 3gb/s from sataIII port)

[Mylar]

So yes, my first problem was that my ssd (80gb x25m gen2) says in bios that its only getting 3gb/s while my normal harddrive gets 6gb/s (which they both should get since they are both in sataII ports).

Secondly, I was told AHCI was a must to get decent speed out of my ssd, and I tried enabling the only non-raid AHCI option in my bios (after doing the registry-fix from windows) and the only result is that now my comp waits for 30-40secs when the windows-logo comes in early boot. The ssd gets the same speed as before.
The AHCI option I enabled was the one under the SataII header in integrated peripherals(i think).

What to do, and how can you fix the 3gb/s thing?

 

[lars36]

ok...after looking at Myler screen shot showing his ssd is only getting 3gb/s of speed and his wd getting 6gb/s, my screen shows just the opposite, on my screen it shows wd hd on top getting only 3gb/s of speed and it shows my ssd under my wd hd getting 6gb/s...now, both my ssd and wd should read 6gb/s of speed. i don't know why wd hd doesn't show 6gb. so i guess my questions would be, i guess, 1. why doesn't my wd show 6gb/s of speed. 2. if i swapped my cables so they where in the opposite sata port on the mb would the readings be the opposite...3 gb/s for ssd and 6b/s for wd hd, which would be like Mylar screen shot and i do understand hiss ssd is 3 gb ssd...anyone?

 

[HU16E]

ok...after looking at Myler screen shot showing his ssd is only getting 3gb/s of speed and his wd getting 6gb/s

lars36, check with WD, as some models had to have revision/firmware updates. Remove any jumper on the HDD if there is one.  

 

[Stu]

lars36,

If you need help with a problem you're having, please start your own new topic, rather than hijack this one, even if you have a similar problem, albeit with a different mainboard.

 

[Henry]

Have you even bothered to run any benchmark tests on your HDD's to compare them to test results conducted by others?

1 example I found for the Intel SSD would be average read about 217-218MB/s with HD Tune.

 

[lars36]

stu...not HERE to hi-jack anyone or anything. i came here and used this particular topic b/c of Mylar screen shot...i was THINKING it would easier to explain if EVERYONE could look at the screen shot. you bet i will NEVER EVER hi-jack anyone or anything EVER again...thank you for all your help and setting me stright.

 

[Mylar]

This is the benchmark from before I turned on AHCI.

I've only ran it once after AHCI, but it got almost exactly the same result.

 

[sparx1981]

I have the same problem as this. I think it's because the PCIe speed of the Marvell controller is at 2.5gbs. You can see this on the screen shot that was posted here previously. Even though the controller detects it as a 6gbs drive... it's only running at 2.5gbs.

I have no ideas if it's possible to change this 2.5gbs at all?

 

[MarkedOne]

I've only ran it once after AHCI, but it got almost exactly the same result.

It's normal in your case to not have optimal bench :

I guess you set the drive to AHCI and reboot the PC ?

if so the trim function was not working on IDE setting, so your SSD is not clean, and I'm not sure it's working too since it's not a fresh install.

Let check something
first of all open a cmd
type: "fsutil behavior query disabledeletenotify"
if you get :   "DisableDeleteNotify = 1"  TRIM is  disabled
if you get :  ?DisableDeleteNotify = 0?    TRIM  is  enabled
to enable it you enter this :
fsutil behavior set disabledeletenotify 0

 

[Frankenputer]

TRIM works in any mode(IDE or AHCI) except RAID(mirror or striped).  TRIM is OS and drive dependent.  Several here have benched IDE VS AHCI and found IDE to be faster.  Also AHCI performs extra reads/writes which reduce the life of SSDs.

 

[MarkedOne]

TRIM works in any mode(IDE or AHCI) except RAID(mirror or striped).  TRIM is OS and drive dependent.  Several here have benched IDE VS AHCI and found IDE to be faster.  Also AHCI performs extra reads/writes which reduce the life of SSDs.

but the OP own an Intel, I'm pretty sure it's not working on Intel, I have one, I will check it and come back .....

EDIT:look like I was dupe from pretending expert on other forum for the last 16 months, but I can swear my Intel gen 2 set on Ide perform way better after using Intel Tool, if the TRIM was working I will not see a such improvement

anyway to stay on the topic, it will not be bad if the OP check the trim enabling in CMD  

of topic :    Benchmark review  is supose to make something soon  about it

"TRIM is non-specific to either SATA controller mode, and will work equally well in both IDE and AHCI-mode. Benchmark Reviews will soon publish a detailed report that illustrates the recovery levels for each SSD controller tested here."



http://benchmarkreviews.com/index.php?option=com_content&task=view&id=505&Itemid=38&limit=1&limitstart=12

 

[MarkedOne]

Ok just to not mess up with my other post ( so sorry for this double one ) , I get some info from someone I ask and here what he have to say ; 

".....SSD is only one link in the chain. Any link missing == no TRIM. OS, drivers, controller, ssd. ALL four need to be working to get TRIM."

 

[ex_forum_user_3]

This is the benchmark from before I turned on AHCI.

I've only ran it once after AHCI, but it got almost exactly the same result.

You only measured the throughput, that is 1 factor not the most important one.
Do the test again but measure the access-time, with AHCI is doubles (in most cases), that means the drive reacts slower to commands.

 

[RemusM]

Several here have benched IDE VS AHCI and found IDE to be faster.  Also AHCI performs extra reads/writes which reduce the life of SSDs.

That's right.

AHCI is faster only in case of buffered read and burst mode (a rare situation in the real life).
Also, don't waste your time with SATA III.
In the real life a HDD cannot achieve even the SATA II speed.
:grin: