KB4100347 Intel microcode updates for Windows 10 v1803 - January 8 Win Update

what is DPC latency and how do you check it ??

ddelo said:

... and don't get crazy...

It's to late for me. . . I already got there. .

And. . . after lookin' at all those PDFs at Intel, my 👀 are ruined, too. .


Lol...

eXtremeDevil said:

My CPU is i7 4790K and it's not on the document :S

You are affected go here and CTRL+F your CPU.

I have an i7-4770-DT, CPUID 306C3. It is under "Haswell (including H, S), Xeon E3" for "Intel 4th Generation Core Mobile Processor Family". Mine is a desktop so the KB4100347 list can be a little misleading in some cases with the descriptions they use in the list. You probably have the same CPUID. If you run HWInfo, you will get not only the CPUID but also the "Microcode Update Revision" that is currently installed on your system. I installed my update yesterday. I had a copy of the HWInfo report from January and I made one before applying yesterday's update and one after the update. I found that we received an update probably sometime this Spring before this latest one came out. My revision went from "1E" at the beginning of the year to "22" in the Spring, to "24" now.

I also ran the update for my 8 year-old Lenovo Thinkpad and there was no change to the revision code as I suspected as it is too old to get any of these updates.

JohnD

eXtremeDevil said:

My CPU is i7 4790K and it's not on the document :S

ddelo said:

Run Inspectre and see your CPUID. With that, look in the intel document. I believe that it is included. They have included CPUs earlier than yours.

If not mistaken, it's a Haswell CPU

Yes, it is. CPU ID 306C3 I have the same model CPU (i7-4770) but I am upgrading to the i7-4790K. Currently, I run uCode 0x22 (pre-Spectre) so I don't make any adjustments to the OS registry.

Thank you for the registry file @ddelo. It will be very useful with the remarks within.

Winactive,

Actually 0x22 was the first update installed sometime this Spring as I had 0x1E in January. If you apply KB4100347, you will get 0x24.

JohnD

Yes John it is confusing I had just posted this in another thread:

On the second link, the MCU Recommendations. I am a bit concerned. My CPUID is 306C3 according to InSpectre and other utilities such as CPU-Z. I am updated to 0x24. However, in the MCU guide my CPUID matched the Haswell desktop CPUs and revision codes (but was not listed there). A google search also brings up desktop CPUs for that CPUID. Mine should be CPUID 40661 according to the guide (Haswell H).

Also, it says "new production MCU Rev" is at 0x25 and this is an 8/8 document. Shouldn't the microcode that came after this have updated me to 0x25 instead of 0x24?

I suspect that is a future release. There is a new update released on the 21st (KB4346084) but Gen4 is not included in it. Only 6th Gen and up.

JohnD

ddelo said:

Run Inspectre and see your CPUID. With that, look in the intel document. I believe that it is included. They have included CPUs earlier than yours.

If not mistaken, it's a Haswell CPU

eXtremeDevil said:

My CPU is i7 4790K and it's not on the document :S

andyouf said:

Yes John it is confusing I had just posted this in another thread:

On the second link, the MCU Recommendations. I am a bit concerned. My CPUID is 306C3 according to InSpectre and other utilities such as CPU-Z. I am updated to 0x24. However, in the MCU guide my CPUID matched the Haswell desktop CPUs and revision codes (but was not listed there). A google search also brings up desktop CPUs for that CPUID. Mine should be CPUID 40661 according to the guide (Haswell H).

Also, it says "new production MCU Rev" is at 0x25 and this is an 8/8 document. Shouldn't the microcode that came after this have updated me to 0x25 instead of 0x24?

Yes, as I've pointed out previously the Microsoft updates are not in step with the Intel ones, but hopefully KB4346084 will contain the updates to 0x25. To retain 0x22, I just hide it.

With the Broadwell (306D4) I have in the laptop, I hope 0x2B is in it. My UEFI only contains 0x2A.

You'd think an Intel document would have the processors in their proper place with the correct CPUIDs.

Why are you retaining 0x22 instead of updating?

Would a BIOS update change microcode versions on the CPU (say to 0x24) or that is at a higher level and just BIOS versions are changed? Are BIOS updates ongoing or is one update a permanent fix (or mitigation) for both Spectre and Meltdown?