Question i9-9900KS Lowering Temp & Undervolt settings check

Jun 2, 2020
So I'm a bit on the OCD type and easily worried, my gaming temp sometimes can hit as far as 94c on stock settings BIOS. Which is totally not cool at all, so I take an initiative to learn undervolt but yeah you can easily find OC guide result more often then undervolt and i9-9900k as dominant result compare to i9-9900KS. Therefore, I decided to use OC settings but lowering the Vcore w/o disturbing the clock ratio , so I remain it as stock 5ghz.

So I begin my test with the settings I used (can find the screenshots below):
*note that I live in hot climate , temp during day around 31-34c.
*checked on stock BIOS settings my stock Vcore is 1.404v which is I think is high

@1.3v = No BSOD on cinebench r20 and during gaming on heavy tittle like BFV and COD Warzone Didn't test on P95 because it is very overkill stress test. No aida test.

@1.28v = No BSOD during gaming and temp basically stays lower than 77c sometimes spike to reach 81-82c, Cinebench R20 temp is around 90c if I'm not mistaken. No aida test.

@1.25v = BSOD after gaming for few hours . Cinebench R20 passed . Aida64 stability test lasted for 1hours and 15mins then BSOD at max temp 95c no throttling.

@1.26v = No BSOD to date , feels like not doing aida64 test since gaming on 5-7hours nothing happened . Temp is also good at under 65c only sometimes spike 71-72c then maintain back under 65c . Idle temp is 5c more then my stock BIOS settings, which around 42-44c. If BIOS settings depends on liquid temp, if 35c on liquid temp usually CPU at 36c or 37c.

Screenshots(Album) current BIOS settings: View:

My main goal is to lower my CPU temp so my question is ,
  1. Is my BIOS settings okay?
  2. If I wanna pass aida64 stability test what changes is required?
  3. I read on some post that I need to change the value for VCCIO and VCCSA, but I don't have any experience on this or so. Please enlighten me on this.
  4. If there's any wrong settings/value please let me know I will change it.
Full Specs:
  • i9-9900KS
  • Z390 Aorus Master | BIOS version F11c (Latest)
  • G.Skill Trident Z 32GB(8GBx4) 3200Mhz CL14 (8GBx2 Trident Z RGB + 8GBx2 Trident Z NEO) B-Die
  • NZXT Kraken x72 mod with Noctua NF A12x25
  • RTX 2070 Super
  • EVGA G+ 1000w
  • Lian Li PC-O11 Dynamic top mount radiator as exhaust others(side and bottom) as intake.


P95 isn't overkill. It is used to test cooler thermal stability - small FFT, AVX off. Make sure error reporting is checked in the options tab.
Cinebench R20 'infinite loop' covers voltage stability.

1)You should use an AVX offset of 2 or 3. Some applications and stress tests do use AVX instructions, and that running at the same frequency as the normal SSE instructions = :hot:
They also draw more power and require more voltage for stability VS SSE.

2)I'm not that familiar with Aida64, so someone else would have to answer this one.

3)They can help with memory overclocking, like 4000mhz or so. Not necessary for 3200mhz.

4)Just the AVX offset from what I can tell.