Neoprod
Honorary Master
Fokkit, 3866/1933 is slower than 3733/1866 and it's not even margin of error close.Here's something weird...my pc is stable with memory @ 3733mhz, infinity fabric (fclk) 1867 and mclk 1867 (the 1-1-1 AMD says to aim for). Last night I decided to take 3800mhz for a spin - it just refused to post. Even with the memory set all the way down to 2133, the CPU (or BIOS maybe) would not work with fclk set to 1900. So I'm thinking, meh - bad luck with the silicon lottery, this CPU doesn't work at 1900mhz fclk.
Then I tried fclk @ 1933 and lo and behold, it's alive. Only problem is, the memory doesn't want to boot at 3866 - even with all timings set to auto and geardown mode enabled. So that's a new thing to figure out on the weekend - might need some more voltage or command rate 2t maybe.
Pretty weird that a lower infinity fabric frequency doesn't work but the next step up does.
Trash auto-timings with memory at 3600Mhz and fclk @ 1933 -
View attachment 1144734
Tortured the poor RAM for niks...the latency penalty from the desync above 1900 fclk is just too damn high (67ns vs 57ns).
3800/1900 would be ideal but it still doesn't post at 1900 fclk.
Tried 0.95 up to 1.2 in 0.05 increments...no luck. I'm leaning toward some kind of bios issue but I'm on the latest and don't feel like flashing older versions to see if they're better. 3733/1866 will have to do.Try setting your vsoc voltage to 1.0 or 1.1V. I heard that higher is not better so 1.0v is best
