Every MSI Z370 BIOS Region is too large to replace that of my MSI Z170. Should I be starting with a Z370 BIOS and work my way backwards through modding?

Zitat von RussianEnthusiast im Beitrag #315

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Where to find newer microcodes for quad and hexa?I want to get last update before spectre/meltdown fixes.
Also, if someone explain how to extract microcodes from a bios file that would be a lot better. I know that should me via MMtool or Uefi Tool but i don't know what is the name of the microcode's body...

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Thanks @mtothaj . Disabling HT did the trick. Apologies for not following your instructions before. For other folks that don't have old processor with HT - nvram variable 0x4CF should be set to 0x0 to disable HT on Maximus VIII Impact. When I figure out how to disable HT by default I will post it here.

Zitat von s.napi im Beitrag #318

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When I figure out how to disable HT by default I will post it here.

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@GnatGoSplat
Thanks for explaining.I've added both quad and hexa from Z370 Pro4 bios. It seems like versions of microcodes 72(quad) and 70(hexa) are the latest before the security patch which also slowing down the perfomance of CPUs. I used i3 6300 and after updating bios with microcodes ver 84 the cpu became as slow as a Pentium G4560 before the slowing down patch.
Anyway, as for me It's better to control when mobo has coffee lake support fully than skylake and only quad coffee.
But still I'd like to add more codes than just two. I just didn't get is it dangerous or not?And how to do that?

@Mov AX, 0xDEAD Actually I was struggling to achieve this (via changing NVAR) until I realized that I do not verify/programm the BIOS chip properly. So if anyone is interested: NVAR store->StdDefaults->Setup->byte (variable) at offset 0x4cf: 01 - HT enabled, 00 - HT disabled. I also changed the byte in two other locations: NVRAM external defaults->StdDefaults->Setup->byte at offset 0x4cf.

Now the interesting question is why does the HT not work (on M8I with 8700K)? Any ideas what should be done to make it work?

@RussianEnthusiast
I also used MMTool to add more microcodes to my BIOS, and it seems to work.
[GUIDE] Coffee Lake CPUs on Skylake and Kaby Lake motherboards (20)

If you are replacing a microcode, you need to delete the old microcode by changing "Patch Options" radiobutton to "Delete a Patch Data", then click Apply. After that, or if adding a new one, you just click "Browse" button, select your new microcode, then change "Patch Options" radiobutton to "Insert a Patch Data" and click Apply. Then click "Save Image" to overwrite existing BIOS or "Save Image As" to save a new BIOS file.
Someone mentioned the possibility there may be _FIT_ problems, but as I said in the post I linked to, I ran mCodeFIT to check my ROM and it looks like it didn't find anything that needed to be moved. So I just flashed it and tested it with 3 different CPUs and they all worked.

You make a good point, maybe I need to downgrade my microcode to older versions because I don't really care about the security patches, I care more about performance.

Zitat von GnatGoSplat im Beitrag #322

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@RussianEnthusiast
I also used MMTool to add more microcodes to my BIOS, and it seems to work.

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Start with new BIOS, remove one code with MMtool only, then insert only the one you couldn't previously and only that one.
Then save file, take to UBU and update more adding the others you wanted, and if needed edit UBU batch file and folder contents.

@RussianEnthusiast
What does it do when you try to add more? I was able to just add them as I mentioned without it complaining. Maybe my BIOS has more space allocated for microcodes, but the chip is just an 8Mb so not sure. If MMTool gives error messages on adding more than 2, you probably need to do what @Lost_N_BIOS says.

One thing I'm curious about, Spectre and Meltdown patches can be disabled in Windows using powershell or a program called InSpectre. Does just having the newer microcode reduce performance regardless of whether the patches are disabled in the OS? Or does disabling it in the OS make the processor perform like it does with older microcode? I could switch the microcode, reflash, and run benchmarks, but I'm hoping someone else has already done it and save me the trouble. :)

can you help me make coffe lake bios for gygabyte z270x gaming 9 plz?

Hi all,
@Wolf Larsen modded bios for my MSI B250m Mortar - thanks for your help ;-)
- all is working ok with i3 8100 == here is bios https://drive.google.com/open?id=1iIdfoY...e6CdoYeDnV7Ixdx (modded 7A69v23)
I was using raspberry Pi Zero to flash rom via JSP 1.

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My old CH431A programmer stopped working and had to wait a few days to get a new one, but I successfully booted an i3 8350k on an Asus H170i-plus D3 (ITX H170 board using DDR3) and tested both integrated and PCIe graphics. Both booted. I don't have time for stability testing at the moment but I'll get around to it this weekend. Thanks so much for this awesome guide!

Now I realised that quad core cpu is not enough for me :)
Planning to buy hexa i5. I want to clear up something. For any six-core should be done cpu pads mod, right? Bios mod done already.