09-29-2020 10:46 AM
09-29-2020 11:30 AM
Gunny Cassidy wrote:
I tried bumping SA/IO and DRAM voltages
09-29-2020 12:17 PM
Arne Saknussemm wrote:
Hi there...what voltage have you tried?
1.45 DRAM 1.3 SA and IO? Some of these CPUs are plain bad to get higher than 3600 on...
The last part you answered your own question I think LOL
09-29-2020 11:28 PM
09-30-2020 12:44 AM
09-30-2020 07:50 AM
You don't have to change dram voltage or up vccio or vccsa. Reset these too to default: MCR Fast Boot: enabled Round Trip Latency: enabled, MCH Full Check: disabled.
The only thing you have to do is play with rtt_park values for channel a and b. These 2 settings are found under dram timings menu>skew control. If you have dual rank modules set those to 240 clocks and if you have single rank modules to 120. Set the vccio and vccsa voltages to 1.25 both. There is no way you need more than that for 4000 memory.
10-27-2020 03:34 AM
11-07-2020 10:22 AM
03-09-2023 01:19 PM
I ran into issues with high clocked kits DDR4-4000 on my i9-9900K and found setting the Initial BCLK to 99.9Mhz got it booting up just fine. This makes it so on the initial portion of the boot when the system is doing memory training it's running at 99.9Mhz. Once memory training is completed it will set the final BCLK value. Also make sure the regular BCLK value is set to 100.000Mhz though in the BIOS. Set it manually make sure it's not Auto.
I noticed this could be an issue as a few times I tried slower memory speeds DDR4-3000 and found on bootup it was actually giving me 104Mhz BCLK for some reason with that set to Auto. That high of a BCLK throws your memory clock significantly higher than the rated speeds.
100Mhz x 15 Ratio = 1500Mhz x 2 = 3000Mhz Memory
104Mhz x 15 Ratio = 1560Mhz x 2 = 3120Mhz Memory (120Mhz overclock)
100Mhz x 20 Ratio = 2000Mhz x 2 = 4000Mhz Memory
104Mhz x 20 Ratio = 2080Mhz x 2 = 4160Mhz Memory (160Mhz overclock)
That higher BCLK was causing the system to fail booting on higher speeds as the higher the ratio the bigger overclock you'd actually end up getting.