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Official BIOS (Matisse 2 support) ROG CROSSHAIR VIII HERO / FORMULA / IMPACT 2103 BIOS ROG CROSSHAIR VIII Series BIOS 2103 "01. Improve system performance. 02. Update AMD AM4 AGESA V2 PI 18.104.22.168 Before running the USB BIOS Flashback tool, please rename the BIOS file (C8I.CAP) using HERO : https://bit.ly/38V2Xee HERO WIFI : https://bit.ly/2WimfoI FORMULA : https://bit.ly/38U9nKO IMPACT : https://bit.ly/2DIOsii 2020/7/15 BIOS UPDATE (Matisse 2 support) LN2 BIOS ROG CROSSHAIR VIII HERO / FORMULA / IMPACT 2010 BIOS HERO : https://bit.ly/2ZvgBBC HERO WIFI : https://bit.ly/3j0FbCi FORMULA : https://bit.ly/30a4DwH IMPACT : https://bit.ly/32iKxTx 2019/10/28 ADD ROG CROSSHAIR VIII IMPACT 0044 0045 BIOS IMPACT : https://bit.ly/2ZpvQO9 0044 = Fixes memory divider issue, normal BIOS, have memory fail count recovery mode. 0045 = Fixes memory divider issue, no fail count recovery mode. Can use retry button forever. ROG CROSSHAIR VIII HERO / FORMULA 1103 BIOS HERO : https://bit.ly/2NM8kT4 HERO WIFI : https://bit.ly/33oKEe7 FORMULA : https://bit.ly/2PUu8ON based on AGESA 22.214.171.124 LN2 jumper enabled, Manually VDDG CCD = 1.2V, VDDG IOD = 0.9V For LN2 ROG CROSSHAIR VIII IMPACT 0050 BIOS IMPACT : https://bit.ly/36fo2yf based on AGESA 126.96.36.199 Fix Incorrect MemClkFreq above DDR-5000. Add micron/spectek DDR4-5000 auto tuning rule. Add SK Hynix DJR DDR4-5000 memory preset. Add memory OC fail count, 0 is disabled will not recovery setting and enter safe mode, max 10-times retry. Add BCLK fraction function. No cb ROG CROSSHAIR VIII IMPACT TEST 0017 BIOS IMPACT : https://bit.ly/31PDpu4 based on AGESA 188.8.131.52 PATCH B.CLDO VDDG now separated, VDDG CCD and IOD, can set different voltage and huge help under LN2 OC.CLDO_VDDP now show in main BIOS page, no need to switch into tweaker's paradise page.minor changes in bios. tRFC / tRFC2 / tRFC4 now max value can do 1023. LN2 jumper enabled, FCLK = 1566, VDDG CCD = 1.2V, VDDG IOD = 0.9V. LN2 jumper enabled DRAM voltage = 1.65V. OCPACK Turbov and CCX OC Tools : https://bit.ly/2MHzo7X MemTweakIt : https://bit.ly/2UhX8An Zen Perfboost : https://bit.ly/2kBs15c (After loading CineBench R15 or Geekbench3 bench then run the boost, just click defaults button after benching to prevent bsod) USB Flashback LN2 OC TIP There is an FCLK cold bug under LN2 so try to stay around 1400~1600 for FCLK under LN2 to get a good compromise between temps and perf. To improve stability in this case: VDDG 1.15v, SOC 1.28v, disable DF Cstates. Depending on the CPU and FCLK, may have to control temps -120C ~ -170C. I typically use 1.55v SOC just to get as high an FCLK/Cold bug margin as possible. Do not be alarmed when it resets when temperature changes, pcie and fclk needs to retrain when temps change. Also sometimes there is temperature hole so going lower than it hangs may help. FCLK Biggest problem on the platform 1200 default freq and supposed to go 1:1 with memory for best latency. Improves performance but limited, ~ 1800+ on air and 1400 on LN2. FCLK instability includes hang at postcodes such as ‘07’, stuttering in OS, drop performance in Cinebench. CPU has FCLK cold bug. Improve FCLK Margin by using 1.15VDDG (too much will hang) and 1.3+v SOC. Since VDDG is sourced from SOC so SOC should be higher. VDDG only takes effect at 1400+ FCLK so under LN2 you need to set 1400. Higher usually fails during LN2. Enable LN2 mode, Use the Load LN2 profile as a base template, this uses low vcore so you can save exit when it’s not cold. You will need to do this before -40C to avoid cold bug. You need 1400 FCLK + 1.15v VDDG and 1.35~1.45VSOC. Post codes 07 : too high fabric / fabric unstable (can press reset 2~3 try but If not solved You need to reset the flck clock after lowering the temperature to -120c.) F9 or 23 : High Memory Clock / Tight Timings (Memory reset need) other code : (can press reset 2~3 try but If not solved You need to lower the temperature to 100c ~ 120c.) About AMD Limitations Safemode cannot restore back to stock memory settings as this takes place in the ‘PSP’ which the BIOS has no control over at that point of time. Either you have to clear cmos or wait for 5 times of post code ‘F9’ to get into AMD’s recovery mode. AMD’s recovery mode restores every AMD option back to stock, including timings and CLDO voltages. Because of the above, try not to clear cmos during LN2, at most go safe mode if your settings can be sustained with 1.5v DRAM, since BIOS will apply 1.5v for safemode when LN2 enable. IF you clear cmos, FCLK will go back to Auto and CLDO VDDG voltage will too. When cold, FCLK needs to be 1400+ and VDDG 1.15v if not Fabric will be unstable so you need to torch up to maybe -60c in this case. Therefore test your Memory settings on ambient first. Cold CPU improves Memory OC so you don’t need to worry about MC cold bug. TRY NOT TO CLEAR CMOS WHEN CPU IS COLD Enjoy!