Stock configurations cause instability for 7900X.
Stock configurations cause instability for 7900X.
Hello, I recently assembled a new PC with the following specs: CPU 7900X, Motherboard MSI x670-P, RAM G.Skill 6000 (30/38/38/96), and I attempted to use Curve optimizer with EXPO profile enabled. I encountered issues with CoreCycler. After entering the memory timing manual without EXPO, set NB/SOC to 1.03, and still faced errors with CoreCycler. I ran a stability test on OCCT CPU for half an hour without problems. I cleared the CMOS, didn’t modify BIOS, and retested, but errors persisted. I downgraded the BIOS to the latest stable version (7D67v19), but problems continued. I tried the last stable CoreCycler version before the alphas, still getting errors. The error message is: "The Prime95 process doesn't use enough CPU power." It seems there’s no blue screens or random reboots yet, only these CoreCycler issues. I purchased the CPU from Kijiji in Canada in a plastic tray, so returns might not be an option. What should I do next? Thank you.
I looked for the issue you mentioned but found limited details. The error "The Prime95 process doesn't use enough CPU power anymore" isn't commonly reported, especially since it's not a typical rounding or instability problem. Switching to CoreCycler with yCruncher resolved the concern, and running three cores consistently passed the 6-minute test without triggering this warning.
This situation isn't what it used to be. When AM5 first launched, AMD advised manufacturers that 1.4V was the upper safe boundary. While not mandatory, they increased the SOC voltage on their boards to improve memory overclocking performance. Later research revealed this 1.4V limit was excessive and often damaged AM5 processors, especially the X3D models. AMD now limits SOC voltage to 1.3V in AGESA firmware, and most boards follow this recommendation. It's unusual to find a board ignoring it—possibly due to a suboptimal voltage measurement location, which might cause inaccurate readings. Still, manually lowering the voltage below 1.3V is generally safe, though core voltage tends to rise under heavy single-threaded workloads (around 1.45V). The core voltage is relatively stable, so undervolting mainly boosts performance unless you're chasing extra gains. High core voltage can lead to overheating, and it fluctuates with load—Cinebench should drop the voltage to about 1.2V or less under sustained use. If you decide to undervolt, use the curve optimizer with a negative offset and watch for instability during idle tests. Just be cautious of potential blue screens when copying files to a flash drive. SOC remains the only concern for Ryzen 7000 series, as previous guidelines were too high. Everything else is fine with standard settings.
You're stable at about 6 minutes per core with NB/SOC at 1.15v. I plan to lower it once the optimizer settles. For testing idle conditions, let me know.
I checked the numbers and found some issues. The 6400 setting isn't working, tCL doesn't function at 28, and y-cruncher fails at 36. Other times are copied from Buildzoid clips. Following your advice, I tried y-Cruncher VST for an hour and memtestpro at 2000%, which seems thorough. Running the AC at around 22°C with a fan aimed at the RAM should help prevent overheating. Please let me know if these steps improve stability before moving to the next stages. Thank you.