On GitHub https://github.com/platomav/CPUMicrocodes/tree/master/AMD old micrpcode
cpu00830F10_ver08301025_2019-07-11_337F26F5.bin
What is it?
cpu00830F10_ver08301034_2019-10-24_1D1A2F9D.bin

I have a question regarding the latest 1067a microcode update for the Core 2 architecture: Is there a changelog for thie latest code update that was released in 2015? I'm asking because Microsoft seems to deliver an older version for the 1067a chips in the mcupdate_GenuineIntel.dll file within Windows 10. As far as I can tell LGA 775 to 771 modding became a thing in 2014, so I was wondering if the 2015 update was somehow aimed at making this kind of modding less succesful performance wise - and am also curious why it's not included in the Microsoft file.

Zitat von sittingduck im Beitrag #378

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I have a question regarding the latest 1067a microcode update for the Core 2 architecture: Is there a changelog for thie latest code update that was released in 2015? I'm asking because Microsoft seems to deliver an older version for the 1067a chips in the mcupdate_GenuineIntel.dll file within Windows 10. As far as I can tell LGA 775 to 771 modding became a thing in 2014, so I was wondering if the 2015 update was somehow aimed at making this kind of modding less succesful performance wise - and am also curious why it's not included in the Microsoft file.

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Thanks a lot - excellent walkthrough. Obviously I'm running a very old platform (P965 with Xeon E5450) and it's running fine. I was trying to determine whether it would make sense to downgrade to the pre 2015 microcode, but it sounds like I shouldn't bother, so I'll keep using the latest one. Thanks again.

New in Windows 10 build 19564:
!New_cpu306C3_plat32_ver00000028_2019-11-12_PRD_DBD4CFD1.bin
!New_cpu306D4_platC0_ver0000002F_2019-11-12_PRD_8B6D899D.bin
!New_cpu40651_plat72_ver00000026_2019-11-12_PRD_7784160A.bin
!New_cpu40661_plat32_ver0000001C_2019-11-12_PRD_D552A842.bin
!New_cpu40671_plat22_ver00000022_2019-11-12_PRD_00B9F4B1.bin
!New_cpu406E3_platC0_ver800000DA_2020-01-09_PRE_9AAA1FEF.bin
!New_cpu50653_plat97_ver01000154_2019-12-20_PRD_909D6278.bin
!New_cpu50654_platB7_ver02000068_2019-11-18_PRD_707F7CDD.bin
!New_cpu50657_platBF_ver05002F00_2020-01-14_PRD_C6A68CE6.bin
!New_cpu506E3_plat36_ver000000DA_2020-01-09_PRD_68102B04.bin
!New_cpu806E9_plat10_ver000000D2_2020-01-09_PRD_2283F628.bin
!New_cpu806E9_platC0_ver000000D2_2020-01-09_PRD_99EB87E3.bin
!New_cpu806EA_platC0_ver000000D2_2020-01-09_PRD_88F3599C.bin
!New_cpu806EB_platD0_ver000000D2_2020-01-09_PRD_E6B3256E.bin
!New_cpu806EC_plat94_ver000000D2_2020-01-10_PRD_F4437C0F.bin
!New_cpu906E9_plat2A_ver000000D2_2020-01-09_PRD_2B0E721D.bin
!New_cpu906EA_plat22_ver000000D2_2020-01-09_PRD_711B4326.bin
!New_cpu906EB_plat02_ver000000D2_2020-01-09_PRD_F06E548E.bin
!New_cpu906EC_plat22_ver000000D2_2020-01-09_PRD_F7C1EE8A.bin
!New_cpu906ED_plat22_ver000000D2_2020-01-09_PRD_02ACFA7D.bin

Would be nice if somebody tested the performance for the new Coffee Lake microcode, the previous CA version was rather disastrous. I'd test it myself, but my motherboard is cheap and doesn't have dual BIOS, so if the flash fails I'd have to buy a reprogram tool.

@Marvin what is the reason for the new microcodes?

Most likely to fix https://www.intel.com/content/www/us/en/...l-sa-00329.html

It is not public yet but I tested new 306C3 and it's now reporting a totally undocumented bit in CPUID:
27:
eax in: 0x00000007, eax = 00000000 ebx = 000027ab ecx = 00000000 edx = 9c000400
28:
eax in: 0x00000007, eax = 00000000 ebx = 000027ab ecx = 00000000 edx = 9c000600

EDX has changed from 9c000400 to 9c000600 meaning now an undocumented bit 9 is active.

Latest intel documentation about this is here:
https://software.intel.com/security-soft...hitectural-msrs
Bit 10: MD_CLEAR supported.
Bits 25-00: Reserved
Bit 26: IBRS and IBPB supported
Bit 27: STIBP supported
Bit 28: L1D_FLUSH supported
Bit 29: IA32_ARCH_CAPABILITIES supported
Bit 30: Reserved
Bit 31: SSBD supported

I bet in a few weeks we will know what Bit 9 means.

@Marvin Normally Windows 10 will load those new microcode when running instead of the older microcode via bios. But on 19564.1005 build It was loading bios microcode which older than Windows 10 library above. Do you have any Idea about this build practice?

Can we doing something via regedit to use the new microcode from this build?

Zitat von Marvin im Beitrag #384

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Most likely to fix https://www.intel.com/content/www/us/en/...l-sa-00329.html

I bet in a few weeks we will know what Bit 9 means.

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@RvdH maybe is only an optimization?

Zitat von Marvin im Beitrag #384

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Most likely to fix https://www.intel.com/content/www/us/en/...l-sa-00329.html

It is not public yet but I tested new 306C3 and it's now reporting a totally undocumented bit in CPUID:
27:
eax in: 0x00000007, eax = 00000000 ebx = 000027ab ecx = 00000000 edx = 9c000400
28:
eax in: 0x00000007, eax = 00000000 ebx = 000027ab ecx = 00000000 edx = 9c000600

EDX has changed from 9c000400 to 9c000600 meaning now an undocumented bit 9 is active.

Latest intel documentation about this is here:
https://software.intel.com/security-soft...hitectural-msrs
Bit 10: MD_CLEAR supported.
Bits 25-00: Reserved
Bit 26: IBRS and IBPB supported
Bit 27: STIBP supported
Bit 28: L1D_FLUSH supported
Bit 29: IA32_ARCH_CAPABILITIES supported
Bit 30: Reserved
Bit 31: SSBD supported

I bet in a few weeks we will know what Bit 9 means.

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I do try it (MC 28) with a 4790 and my BCLK max. is less good.

MC 27 => BCLK 106Mhz
MC 28 => BCLK 105Mhz

@Marvin i found this:

SHUF* instruction implementation flaw (DoS)

A flaw was found in Intel microprocessors’ implementation of packed byte shuffle AVX instructions (SHUF*). The defect can be exploited to cause stability problems in the processor and possibly create a Machine Check Exception (MCE).

This could allow an attacker with a local account to possibly crash the system or the host within a guest on a virtual environment.

This issue requires a microcode update and it is expected to have no expected performance impact or change.

Maybe this is the bit 9