@@Leon: Thanks for the quick reply! I did as you suggested (twice) and, strangely enough, it did change the configuration BUT in the wrong direction! It now shows CORES: 2, LOGICAL PROCESSORS: 4. I did a second BIOS default and it's still the same.
I have 3 shots of the BIOS screen; I hope I added them here correctly.
Hello @PClar6 ,
Leon: I have done as you documented including updating the BIOS to 066. The BIOS shows that all 4 cores are recognized and active. But, there is no change - the TaskManager still reports 2 Cores & 4 Logical. Interestingly, the L1 Cache shows 128KB (on my other KYK it's 256KB) and the L2 Cache shows 512KB - again it's 1/2 of the other NUC which seems to suggest that the hardware may be faulty. I'm beginning to think I may have a hardware issue with the motherboard/I7 CPU.
Leon: The mystery deepens. Both the TaskManager and the Intel Diagnostic Tool agree that there are only 2 CORES, the diagnostic tool says PASS!!! The BIOS does show 4 cores. I have compared the test results between the two NUC6I7KYK boxes and the only significant difference I can see is that the other NUC is older and has an American Megatrends BIOS and the questionable NUC has an Intel BIOS.
The first upload is the other (good) NUC showing the American Megatrends BIOS dated 06/03/2016. I will uopload the other one next (can't see a way to upload more than 1 image to a message????).
Leon: I truly appreciate all the time you are spending on this issue.
I will try the power/BIOS recovery method today but in the meantime I did try the suggestion regarding setting the number of cores to 1 and then 3 in the BIOS. The results are indicating a fault in either the BIOS or the CPU/motherboard.
TEST: In the BIOS, setting CORE = 1 & rebooting, the TM shows CORE = 1, LOGICAL = 2, but setting CORE = 3 the TM shows CORE = 2, LOGICAL = 4. We seem to be missing 2 COREs.
I'll report back in a day or two after the Power BIOS Recovery.
Again, thank you for your help!
Leon: Have I exhausted all possibilities? I did as suggested and no change at all. The BIOS Power Recovery went well and the system runs exactly as before. I once again did the BIOS defaults, plus I also did the CORE = 1 and CORE = 3 and each time the TM reports the same 1 or 2 CORES and 2 or 4 LOGICAL.
I also set the BIOS to Max Performance Enabled and Win 10 Power to Maximum Performance - no change.
I did a Passmark (CPU only) test on both NUCs and this broken NUC reports a CPU mark of 3689 and the good NUC reports a CPU mark of 7754 confirming (as if we need it) that the bad NUC is indeed 1/2 CPU enabled.
The good news is that this bad NUC is under warranty until June 26, 2020. Do you think I should start the process?
Leon: I did open a ticket on this issue, and then had a light bulb moment vis-a-vis last Tuesday's Windows 10 updates. So I ran the Intel Processor Identification Utility and it reported a clean CPU with all 4 cores operational!
It seemed to me that I first noticed this issue post Windows update and so I did a reload of a fresh copy of Windows this morning and - problem is fixed! All 4 cores & 8 logical are now reported by TM.
Chalk up yet another Microsoft hiccup in their updates. Can't say which KB did the damage or perhaps it was a problem with this NUC but it's fixed (for the moment).
Thanks for all your help. I needed help even though I'm a retired MCSE and IBM SE. Age does take its toll! LOL