Question overclocking help

[scrane5757]

why cant I reach 5.2 ghz at 5.1 oc but I can easy at 5.0 oc? I9 9900kf. at the 5.1 clock voltage bounces around but 5.0 it is rock solid. any ideas? Seems to be a volt thing as 5.0 does NOT drop where 5.1 does, when volts drop so does clock. At 5.1 bounces from 5202 to 4890, but fine at 5.0? This volts thing just started as it was fine before.
msi z390 mb-pro
aio water cooling 360
32g mem
1300 power supply
15 tb drives

 

[hotaru.hino]

Either the motherboard may not really be up to snuff (it doesn't look like it's built for overclocking much, if at all) or you simply lost the silicon lottery.

 

[Eximo]

Chips degrade over time and you may have to re-do your overclock as the system ages. Fairly normal I would say. You can apply more voltage, but that will accelerate things.

Your CPU cooler may also be starting to get clogged up inside and you have reduced hotspot temperatures you can't necessarily see with monitoring tools.

 

[lolvatveo]

some cores will be unstable at high speed, try overclocking each core individually and use prim95 to find unstable core. the voltage should not be more than 1.3625volts. 14nm is an old process and your i9 9900k is running at a very high level, intel sold an "unlocked" chip when it couldn't be overclocked much more and started having problems. unlike i3, pentium&celeron really worth overclock it but Intel has locked all way overclock to get free performance with low budget

 

[scrane5757]

found out that it was an update that messed up my 5.2 oc, had ttto clean install after flashing bios to a earlier version then back to the lattest. MSI motherboard problem now 5.2 at 1.36v. JUST TO LET YOU ALL KNOW.

BTW THIS CHIP WILL DO 5.3 AT 1.375V- I know its hi but no heat and stable as can be. I still like it at 5151 the best as its performance for the volts is great at that speed.

somehow the update did a bad thing - microcode I suspect, especially when it messes with bios. tried each core separate and it wont reach as hi as all core clock and is less stable.

 

[scrane5757]

Chips degrade over time and you may have to re-do your overclock as the system ages. Fairly normal I would say. You can apply more voltage, but that will accelerate things.

Your CPU cooler may also be starting to get clogged up inside and you have reduced hotspot temperatures you can't necessarily see with monitoring tools.

turned out to be an update, that affected the bios also, suspect microcode.

 

[lolvatveo]

you can also try overclocking turbo boost too so it only randomly increases one core to high frequency when needed, not all cores at high frequency. this will squeeze out the heat and voltage headroom

 

[scrane5757]

you can also try overclocking turbo boost too so it only randomly increases one core to high frequency when needed, not all cores at high frequency. this will squeeze out the heat and voltage headroom

does way better with all cores clocked. 1 core weak but it seems to make up for that.

 

[scrane5757]

you can also try overclocking turbo boost too so it only randomly increases one core to high frequency when needed, not all cores at high frequency. this will squeeze out the heat and voltage headroom

I am in control of boost and volts, I don't let MSI determine what's best on a CPU. Clocks better. was a microcode thing I think as all is well now after flashing bios to a lower than back and a clean install of windows. Not what I would have thought WOW.