So you massively lose efficiency and this becomes hard to cool. You can maybe push it to +400 MHz all-core for a single-digit performance increase, however, power consumption will shoot up by +50% or so. At least 500 MHz OC would be necessary to achieve a two-digit performance increase - that is unrealistic, unless you have a golden sample. Ideally, it has to be a very good all-in-one water cooler or a custom water cooler to OC without hitting temperature limits. Maybe with a top-end air cooler, you have a slight chance. With an air cooler, the prospects are very small. Its high power consumption and the borderline temperature significantly limit the overclocking options. This is why, for the Z490 boards, only the cheapest models kept the seperate MOSFET solution: įor the Z590 boards, there was not a single model (!) still using the MOSFET solution: If you have seperate MOSFETs with high switching losses and pull 200+W through the CPU, you can get dangerously high temperatures around the socket.
This can be seen in most reviews of cheaper Z390 boards. This type of board was not designed with a 9900K in mind. To reiterate, the MSI Z370-A PRO has a bottom of the barrel 4+2-phase VRM design with the cheapest MOSFETs they could get. The VRM will heat up significantly, because the MOSFETs lack in efficiency and there are not enough of them to spread the thermal load, which might lead to VRM throttling or even shutdowns if you attempt to OC significantly. But the cheap Z390 board models are getting really uncomfortable when running the 9900K at full pelt even without any OC.
But you are using the 9900K, the first CPU that Intel pushed to the limit (the 8700K before was much more tame, but by the time of the 9th gen, AMD really brought good competition).
This wouldn't be a big issue with a lower-end CPU. All MSI boards but the Z390 GODLIKE use cheap discrete MOSFETs for the CPU VRM, but the Z390-A PRO has especially cheap MOSFETs, not enough of them, and they are only partly heatsinked.
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