Unable to reach 3600RAM – My 3900x at 1800 FCLK during the journey.
Unable to reach 3600RAM – My 3900x at 1800 FCLK during the journey.
I've been away from the 'game' for a while. This is my first full build. I upgraded to an i7-875K with MSI-GD80 and 16GB RAM. I'm not keen on relying solely on AMD's claims about 1800 at 1.8GHz. I want to stick with the standard 1800:1800:3600 configuration but I'm having some trouble. I'm watching this video: https://youtu.be/7w1EGPZUESU. It worked once at 1800 FCLK, then I ran C20 a few times and adjusted OC, but it kept crashing around 4.6GHz. I can't get back to 1800 reliably. I've tweaked the voltage settings and slowly increased clock speeds without success. I'm curious if I missed something in BIOS—only Ryzen Master seemed to handle it. Most people say they can easily hit 1800, though a few reach around 1733. Did I miss out on the right settings? Thoughts? Thanks for the info. Current setup: Default || 4150MHz FCLK:1600 UCLK:1600 MCLK:3200 [16-19-19-19-39] 1.35v Vcore:1.35 (AMD says 1.45-1.5 is fine) VDC:1.1 VDDG - 1.0 C20:6500 Desired settings: Current settings: Default || 4250MHz FCLK:1800 UCLK:1800 MCLK:3600 [16-19-19-19-39] 1.35v Vcore:1.35 VDC:1.1 VDDG - 1.0 C20:7500 I've tried a stock cooler (ASRock X570, G.Skill Trident Z Neo) and an Antec 900 case with Rocket Gen4 MSI GTX970. I usually stay under 80°C even when pushing it, around 60°C most of the time. Resources: Cooling guides, FCLK specs, OC tips, and forum discussions help a lot.
You're either in the extreme cold or doing something much better than me. My 3900X could hit high 80s on stock with a cooler and overclock, but once it hits over 100°C it stops working right away—even with an H100 it stays around 85°C at stock speeds. Have you tried longer full load tests to let it warm up? A big overclock doesn't matter if it only lasts a couple of minutes.
It looks like you overlooked the distinction between single core and all core tasks. AMD’s 1.45-1.5V is meant only for intermittent single core activities such as moving the cursor or booting Windows. For intensive all core workloads like rendering or Prime95, it typically stays below 1.3V without additional tuning. I wouldn’t exceed 1.3V manually, particularly with stock coolers. Ryzen Master can override BIOS defaults—its own settings hide in the “AMD overclocking” area—and you’ll need to delete them from the BIOS for your adjustments to take effect. Consider increasing memory voltage to 1.4V and test if 1800MHz FCLK works with 3200MHz RAM.
I was quite taken aback. The unit ran hot at 1.45V (40c), but lowering it to 1.35 brought the idle down. After reaching peak, the temperature hit 61°C on C20. I tested P95 for about five minutes just to check its limits, and during all the random adjustments and C20 runs I never saw more than 81°C. I haven't completed a full one-hour P95 test yet—I'll do that once it's stable at stock settings with an idle at 1800, haha. My home AC is set to 24°C (75°F).
Thanks, I'll give it a shot. I believe I didn't apply undervolting because lower temperatures help with stability when OC is stable and my temperatures stayed normal at 1.35. I assumed starting at a higher voltage would suffice since the specs mentioned it. I also thought the IF clock might be more affected by SOC/VDDP/VDDG voltages than the Vcore. I didn't experiment with adjusting the mem voltage, trusting the manufacturer's recommendation. Now I'm ready to restart from the beginning.
Well, I'm not sure what to think about this. It seems the CPU can manage the higher clock speed but memory isn't working properly. I thought with a 3600 MHz memory it should be fine up to half of that, around 1800. Also, I noticed I can't quickly switch to new FCLK or UCLK speeds. It must be adjusting to the smallest increment to keep the system stable. Since I'm just starting out with OC, why is that? Anyway, I'll try this next: CinR20: 7075 AllCore_MaxF: 4023MHz MaxTempC: 78 FCLK: 1800 UCLK: 1600 (3200) DRAM: 1.4v 22-22-22-22-53 Stock voltages: Vcore 1.488 SOC 1.1 VDDP 1.0979 VDDG 1.0979
Memory controller timing isn't fixed to a direct link between UCLK and MCLK, yet FCLK can change smoothly in small steps.
It seems the setup needs careful adjustment. You're aiming for a stable 1600 MHz clock but encountering timing issues that prevent reaching 1700 MHz. The key steps involve fine-tuning UCLK and FCLK to match each other, while managing the DRMM speed. Let me know if you'd like guidance on next actions.
Check if the BIOS is the most recent release. It looks like updates might address some unusual issues.