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Intel SSD slow in Laptop. - Page 2

post #11 of 16
Quote:
Originally Posted by ZealotKi11er View Post

Its in Sata II mode just like my SSD.

That is probably why. Is it not possible to switch it to SATA 3 mode, because I am sure if you re-run the benchmark after you switch it, you will get better results.
     
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post #12 of 16
Thread Starter 
Quote:
Originally Posted by xxicrimsonixx View Post

That is probably why. Is it not possible to switch it to SATA 3 mode, because I am sure if you re-run the benchmark after you switch it, you will get better results.

Why would 4K speeds improve from Sata speed? Also SSD is Sata II not Sata III so there is no benefits.
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post #13 of 16
As said earlier, laptops put power saving above performance, even if the AC PSU is connected. The chipset itself, which includes the SATA interface, runs at lower power by design. Your AS SSD results are normal for a SSD used in a laptop, we've seen that over and over in this forum.

What can you do? Try to defeat all the power saving options. But laptops have very limited BIOS options, so you probably cannot do all the things that otherwise can be done:

Disable some or all of the CPU power saving options in the BIOS, C-States mainly for Intel CPUs, CoolNQuiet for AMD.

Change the Windows Power Plan to High Performance, and edit the Advanced settings for higher performance.

But overall, I've never seen a laptop able to benchmark a SSD at the same level as a desktop PC.
post #14 of 16
Thread Starter 
Thanks for your answer. I did not think power feature could have that much effect in SSD performance. So in reality there is no point on getting a faster SSD because 4K speeds will hit a wall?
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post #15 of 16
Quote:
Originally Posted by ZealotKi11er View Post

Thanks for your answer. I did not think power feature could have that much effect in SSD performance. So in reality there is no point on getting a faster SSD because 4K speeds will hit a wall?

That's a good question, I've never seen enough SSD benchmark results on good laptop PCs to know if there is a limit in I/O performance. I'm assuming that it is only the need or goal to operate at low power levels that results in (for example) lower 4K random read speeds. What else, if anything, is the cause of the lower performance?

We would assume the basic architecture of mobile CPUs and mobile chipsets that contain the SATA interface are the same as desktop PCs, since we use the same OS and software on both. Checking the Intel datasheet for a specific series of chipsets (such as 8 series for Haswell processors, 7 series for Ivy Bridge, etc) the specs for the desktop and mobile chipsets are very similar and identical in most aspects. Intel also has some new mobile processors that have the chipset (or PCH in Intel's terminology) as part of the processor itself. Which also reminds me of the diversity of mobile processors and chipsets, so it is difficult to speak in generalities.

I need to look into this question deeper before I have an answer. I can tell you I cannot recall an AS SSD benchmark result on a laptop whose 4K random read speed was above 20MB/s, regardless of the SSD and SATA interface speed. A result of 15 - 18MB/s is typical, above 18MB/s would be great. We know that CPU power saving options, when enabled, cause lower 4K benchmark scores in Desktop PCs, but will not be in the 15 - 18MB/s range given any decent SSD. Mobile CPUs can have more and deeper power saving states, which causes lower benchmark results.

Many variables and differences to consider, so no one simple answer to your question. We always just blame it on CPU power savings options, but there may be more to it.
post #16 of 16
here is Samsung EVO msata on Ultrabook with i7 ULV processor,so with something like full mobile voltage processor we would see 30.

Edited by Unit Igor - 3/24/14 at 12:43am
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