MoBo is delivering an insane voltage to the CPU!
MoBo is delivering an insane voltage to the CPU!
In my system I have a -0.07V offset. Yes, it tends to exceed 1.4V and jump to 100c during any game, which is similar now too. The Mobo and CPU models are displayed in the attached picture. No overclocking since it's not a K variant. With forced voltage it stays steady at 1.195V (I haven't tested lower). (At that voltage I'm getting around 70-80°C), the problem is that with forced voltage it always stays at 1.195V. Why does the default BIOS setting make the CPU pull such high voltages? I've tried three different BIOS versions, including the latest, but nothing works. Also, even though it's stable at 1.195V when overridden, I can't go below -0.15V with the offset, then the PC won't turn on, but that -0.15V brings me to about 1.3V. Anyone have any advice? (The order is Current / Minimum / Maximum / Average)
You're referring to VID and VCore voltages. VID is the voltage the CPU asks for, while VCore is what the VRM sends to it. By default, they differ slightly, and adjusting VRM settings with offsets makes them even more apart. At 1.4V, it seems reasonable for an 8th generation CPU—it matches typical behavior. It might just mean you're not providing enough power for a 6-core Coffee Lake chip.
Thanks for the update.
It seems the VID voltage was also capped at 1.195V when adjusting the core voltage in BIOS to that level. That’s why I initially thought they were the same. The TDP is 65W, and it’s running around 140W under normal settings—likely due to throttling. It makes sense that cooling isn’t sufficient, but it’s still better than the stock cooler. I’m wondering if this is typical behavior.
It seems Intel's turbo mode really boosts performance initially, but after about 43 seconds it reverts to the base clock for the rest of the task. The 100C behaves differently—it feels like the cooler isn't properly secured, because under full load on a Hyper 212 it should take around 10 to 20 seconds to reach 100C.
They might be facing a few potential issues, though after trying three options I'd lean toward something else. My initial thought would be a thermal paste problem—either the product you're using is of very low quality or you're not applying enough. Still, it shouldn't be this severe. It's also conceivable the CPU has an extremely uneven IHS, which is rare but possible.
It's typical with Prime95. You'll need a substantial AIO to maintain the 8700 cool under heavy load, especially given the poor stock TIM between the IHS and die. Even my delidded 7700K behaves similarly in Prime95, reaching around 90°C and holding there instead of spiking to 100°C. When you mentioned hitting instant 100°C, you were probably referring to software like Blender or Cinebench rather than the most demanding CPU tasks. Also, for an IHS issue severe enough to cause visible problems at room temperature, it would definitely be noticeable without equipment.
I installed pirme95 since HT was turned off and games stopped using it. When HT was active, Minecraft Windows Edition with 32+ chunks could launch instantly.