Low FCLK voltage adjustment on 4650G, possible motherboard issue.
Low FCLK voltage adjustment on 4650G, possible motherboard issue.
Previously my 4650g in the second rig ran at 1.1V SOC, 1.4V memory, steady at 2066MHz FCLK and DDR4-4133 C18-22-22-42. Beyond that it became unstable. I adjusted to 1.15V SOC and got stable at 2133MHz. Today I tried 1.2V SOC but it didn’t improve beyond that. At 2166MHz it’s unstable and 2200MHz won’t boot. Raising DRAM voltage didn’t help, and timing issues persist, suggesting a FCLK limitation. Essentially, a 0.05V rise in SOC didn’t change the FCLK speed. Are there any constraints on the motherboard or other factors at play? My rig specs: CPU 4650G, SOC 1.15V, motherboard Gigabyte B450i Aorus Pro Wi-Fi RAM Crucial Ballistix 16GB, IC Micron rev.E (C9BLM), stock XMP 3600C16, now stable at 4266C18-22-22-42 1.4V. Timings are tight.