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NUC 5i5RYH Bios 368 Slow Performance


After updating to the new 368 bios, my NUC 5i5RYH was very slow. The machine is basically only used for web browsing and some other light tasks as a secondary PC, so I'm not asking much of it. Just running the Windows file browser and web browsers was very slow.

-Responsiveness was very sluggish. It felt like an old atom PC with a slow spinning drive.

-Program launching was slow and would often stall. I updated some drivers right after the bios update and some the installers would just sit there for minutes with no progress. Then they would eventually finish.

-Even maximizing a window was slow and would take a few seconds.

-Browsing directories was slow.

The difference was very noticeable.

On benchmarking with Crystal Disk Mark, random 4k read/write SSD performance with high Que Depth was more than cut in half.

This is with the following SSD: SAMSUNG 850 EVO M.2 2280

368 Bios

Sequential Read (Q= 32,T= 1) : 550.542 MB/s

Sequential Write (Q= 32,T= 1) : 528.400 MB/s

Random Read 4KiB (Q= 32,T= 1) : 99.827 MB/s [ 24371.8 IOPS]

Random Write 4KiB (Q= 32,T= 1) : 86.986 MB/s [ 21236.8 IOPS]

Sequential Read (T= 1) : 480.189 MB/s

Sequential Write (T= 1) : 463.596 MB/s

Random Read 4KiB (Q= 1,T= 1) : 25.436 MB/s [ 6210.0 IOPS]

Random Write 4KiB (Q= 1,T= 1) : 64.319 MB/s [ 15702.9 IOPS]

367 Bios

Sequential Read (Q= 32,T= 1) : 549.253 MB/s

Sequential Write (Q= 32,T= 1) : 529.140 MB/s

Random Read 4KiB (Q= 32,T= 1) : 221.303 MB/s [ 54029.1 IOPS]

Random Write 4KiB (Q= 32,T= 1) : 183.992 MB/s [ 44919.9 IOPS]

Sequential Read (T= 1) : 484.048 MB/s

Sequential Write (T= 1) : 460.311 MB/s

Random Read 4KiB (Q= 1,T= 1) : 31.335 MB/s [ 7650.1 IOPS]

Random Write 4KiB (Q= 1,T= 1) : 77.179 MB/s [ 18842.5 IOPS]

I then went back to the 367 bios and all the above issues were resolved. The system is back to its usually fast responsiveness.

This seems similar to this 5i3RYH issue with the 368 bios:

Overall, something seems off about this update. Hopefully the Spectre/Meltdown microcode fix can be improved upon so that it does not destroy I/O performance on the NUC in Windows.

Benchmarks (other than storage ones) won't fully reproduce this. The best way to reproduce this would be to just gauge the responsiveness of the system before and after the 368 update.


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5 Replies
Community Manager

Hi Goryl: Thank you very much for contacting the Intel® NUC communities. We are sorry to hear the NUC is not working properly after the BIOS update.



In this case, we will do further research on this matter in order to try to find a possible solution, as soon as I get any updates I will post all the details on this thread.



Any further questions, please let me know.





Alberto R



There are reports which the windows Meltdown & Spectre patch + microcode update slow down SSD a lot


Hi Goryl:

The latest BIOS update does contain the updated CPU Microcode (Security Advisory-00088).

If you think your system performance is affected by it, I would recommend that you call for support, here is the "Contact Us" information:


Ronny G


It think that this was just a buggy bios release. I doubt that contacting support would be helpful since I doubt that I could change anything on my end to make that bios work well.

I tried to see if an updated bios was available today. Now it looks like the 368 bios has been removed from Intel's download site.

Now the 367 bios is the latest one available for download. That's a good thing, because it works much better than 368. I'll keep my eyes out for an updated release.

Super User Retired Employee

There were indeed reports of issues and severe slowdowns with the Spectre microcode fix on 4th and 5th generation Core processors. The BIOS was withdrawn because the microcode was withdrawn. When Intel has an updated microcode module for these processors, there will be a re-release of the BIOS providing this microcode. Stay tuned...