i7 8700kWHEA_UNCORRECTABLE_ERROR detected new cpu
i7 8700kWHEA_UNCORRECTABLE_ERROR detected new cpu
Wait a moment. If you purchased it a year ago and it was built about two years prior, then you should be able to connect *both* 4 pins together into the 8 pin slot as a combined 8 pin. The two 4 pins match exactly in design, just plug them together and push them in simultaneously. I’m certain this is the intended method. There isn’t a setup where a motherboard has two separate, split 4 pin connectors—except for models with an extra PCIE connector for additional video power across multiple slots. You’ll only find single 4 pin, single 8 pin, 8+4 pin, and 8+8 pin options. My Seasonic has two 8 pin connectors: one is a "fused" 8 pin (can’t be divided) and the other is a 4+4 pin that can be split. I’ve connected both to their respective 8 pin connectors (Z390 Aorus Master) fully. The low voltage reading you saw when only one 4 pin was in came from your CPU’s +12V measurement being unusually low. You likely needed to connect the entire 8 pin connector on these boards. A single 4 pin isn’t supported, probably because it’s not a standard setup for Z390. It might work for 4-core non-K processors, but it’s definitely not a recommended configuration. Your board probably had a safety measure to handle the lower voltage by itself (which isn’t typical for Z390), possibly because it’s trying to compensate for the single 4 pin alone. It seems your system was unstable—drawing excessively low voltage and the motherboard couldn’t manage the mismatched configuration (4 pin vs 4 pin in separate PSU groups). This could be why you crashed.
It seems the setup might have caused confusion, as the motherboard expected a different pin arrangement. The HWInfo64 data might not reflect the actual configuration, and using HWinfo64 is recommended for accurate monitoring.