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Performance problem of SM951 M.2 AHCI w NUC5i7

Thanostc
By Thanostc
in Storage Devices
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Go to solution Solved by Stefan1024,

Thanks again!Just wondering about reports from other users for speeds from 1600-1800 with the same NUC and idon't think that they used blowers for the benchmarks...do you think that the different OS should make any difference?

Due the the overhead of the OS the CPU migth be so slow to push the drive to 100%.

 

But to be honest, what do you need the speed for? You will hardly feel a real world difference when going from 500 MB /s to 1000 MB/s. The effect from 1350 MB/s to 1600 MB/s is even lower. Yes there are applications that will benefit quite a lot, but it's unlikely you run these on a NUC anyway. Just to less compute power to really utillize the bandwith of the drive, IMHO.

Posted

Hi to all!I just built a NUC5i7 with SM951 256gb AHCI, 16GB Kingston 1866 CL11, Seagate SSHD 1T and windows 10 pro 64bit.. I'm concerned about SM951 because i did some benchmarks with AS SSD & CrystalDiskMark and average read speeds are up to 1350mb/s when in lot of reviews and forums reported read speeds from 1600-1800gb/s with the exact same built... Any ideas?? I just want to figure out if my drive is defective or there is something else i' missing! Thanking you all in advance!

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Wellcome to the forum!

 

This drive tends to overheat very fast in stress tests like benchmarks. In normal usage it might be fine, but if you run the benchmark several times it will thermal throttle.

Use a spare fan, open the NUC and let it blow full speed directly onto the SM951. Than run the test again.

Mineral oil and 40 kg aluminium heat sinks are a perfect combination: 73 cores and a Titan X, Twenty Thousand Leagues Under the Oil

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Thank you very much for your response!!Do you think this is the problem??

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Thank you very much for your response!!Do you think this is the problem??

It can be a problem especially in a NUC with next to no airflow.

But it's more to eleminate the possibilities of errors that are easy to check. You can also download HWmonitor and look at the temperature reported. But sometimes rare products like your SSD will not be detected.

Mineral oil and 40 kg aluminium heat sinks are a perfect combination: 73 cores and a Titan X, Twenty Thousand Leagues Under the Oil

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Thanks again!Just wondering about reports from other users for speeds from 1600-1800 with the same NUC and idon't think that they used blowers for the benchmarks...do you think that the different OS should make any difference?

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Thanks again!Just wondering about reports from other users for speeds from 1600-1800 with the same NUC and idon't think that they used blowers for the benchmarks...do you think that the different OS should make any difference?

Due the the overhead of the OS the CPU migth be so slow to push the drive to 100%.

 

But to be honest, what do you need the speed for? You will hardly feel a real world difference when going from 500 MB /s to 1000 MB/s. The effect from 1350 MB/s to 1600 MB/s is even lower. Yes there are applications that will benefit quite a lot, but it's unlikely you run these on a NUC anyway. Just to less compute power to really utillize the bandwith of the drive, IMHO.

Mineral oil and 40 kg aluminium heat sinks are a perfect combination: 73 cores and a Titan X, Twenty Thousand Leagues Under the Oil

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No i don't have any problem at all, the drive is blazing fast!I just wanted to exclude the possibility for the drive to be defected due to that dif of the read speeds!Thank you very much for your time!

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Dear Stefan,

 

i just made the test you suggested me.. and BINGO!! You are absolutely right!!! I modded a case fan from 2pin power to usb power and put that facing exactly in to the drive and ATTO Disk reported write speeds ABOVE 1200 and read speeds up to 1600mb/s! I know that for the NUC this is the max speed so everything went ok!! Thank you very very much!!

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Dear Stefan,

 

i just made the test you suggested me.. and BINGO!! You are absolutely right!!! I modded a case fan from 2pin power to usb power and put that facing exactly in to the drive and ATTO Disk reported write speeds ABOVE 1200 and read speeds up to 1600mb/s! I know that for the NUC this is the max speed so everything went ok!! Thank you very very much!!

 Hi Thanostc

 

You are wellcome, nice to see the problem is solved!

Pleas quote or mention people with a @ (e.g. @Thanostc) so they get a notification. Otherwise your post may remain anread.

 

And now you can go wilde on the forum ;) I recommend you have a look at the "build log" section.

Mineral oil and 40 kg aluminium heat sinks are a perfect combination: 73 cores and a Titan X, Twenty Thousand Leagues Under the Oil

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