Fixing RAM timing mismatches on Biostar B650MT
I'm honestly speechless. I spent a fortune on an AM5 build only for it to turn into a slideshow whenever I tried to build a complex base. The memory controller on the Biostar B650MT was struggling with 6000 MHz EXPO, with tRFC staying above 500 cycles, causing memory latency to swing violently between 75-95ns. I tried dropping the frequency to 5200 MHz, which stopped the blue screens, but my 1% lows tanked from 45 FPS to 32 FPS—totally unacceptable. I went back into the BIOS and manually pushed tRFC down to 480, bumped DRAM voltage to 1.38V, and locked the SoC voltage at 1.2V. Now, memory latency is a stable 68-74ns and the frame drops are gone. I actually messed up the tRCD setting early on and the system wouldn't even post, so I spent thirty minutes clearing the CMOS. CPU temps are 65-72℃ and RAM is at 52-58℃. I exported the stable profile using the board's config tool, and frame times are now a consistent 16-21ms. Finally, the build is actually usable.
