Cache performance and system agent voltage impact overall efficiency.
Cache performance and system agent voltage impact overall efficiency.
It’s a good question. System Agent Voltage might offer some benefit when boosting CPU cache overclocking, but it’s not guaranteed. If you’re mainly focused on RAM overclocking, the separate System Agent Voltage for RAM is likely more effective. Testing is key—monitor stability before adjusting voltages.
Unless cache has its own voltage setting, it uses cpu vcore. No reason to use more than 1.20v for system agent or Vccio. It'll kill the chip faster. If you're using that much vcore at 5.2 ghz, it's probably too hot and eventually fails the burn in tests. The heat and vcore will wear the chip out fast. I mean, you should be able to pull off 5ghz cpu all core and 4.7ghz cache with around 1.350v give or take. 5.2ghz, you're just beating the chip.
It's quite warm out—around 85°C, which is right at the stability limit. More heat means increased vcore leakage, explaining why you're close to 1.5v. Leakers often push overclocking during cooler periods or with extreme techniques. I'd say keeping longevity above 1% FPS is a good goal. But definitely not exceeding 1.2v with Vccio or System Agent, even on a CL16 4000MHz DDR4 board. If the system auto-runs those higher speeds, lowering them could help with temperatures.
It's about the temperature, not the voltage. The Asus auto settings are probably stuck at 1.45v SA/IO. Likely the issue isn't the voltages themselves. You managed to get it running for 9 hours, so I recommend lowering the maximum temperature as much as possible. Also, consider turning off C-STATE and using a solid V-CORE value.
I have cstates off of course. CPU VCCIO reads 1.056 and CPU VCCSA is 1.136. They're not particularly high. I've also performed the same test before for about 19 hours with temperatures close to these values. The average temps were in the 80s. The main variation is uncore at 43.
You might attempt advanced settings and system agents, though it will increase the temperature. Nothing is lost in trying.