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Z390 Taichi VRM overheat?

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Cosmogator View Drop Down
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    Posted: 29 Aug 2019 at 2:00am
Recently I've been asking ASRock support about VRM temperatures.
Z390 Taichi Ultimate 9900K S36 AIO 32Gb RAM and case with good fans to offer a good airflow.
Everything in stock.
15 minutes of Prime95 smallFFT
HWInfo (latest version) shows me
in ASRock Z390 Taichi Ultimate (IR5201)
VRLoop1 111 C

in CPU Intel Core 9900K: Perfomance Limit Reasons
IA: VR Thermal Alert Yes

Room temperature 23 C





If I put one ML140 to blow to the VRM area - tempertaures are lower, like 100C after 30 min. But I don't feel safe with these temperatures anyway.

Support told me that this program might be wrong, so I should check what A-tuning utility shows me. I REALLY didn't want to install it again - after recent events with 1.65V on RAM. But I did it once - and I can't find anything similar. There is only CPU and MB temperatures - they are OK, HWinfo shows it as well.

This is VRM, or am I wrong?
Where I can find it on A-tuning, to show it to the support?
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Cosmogator View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cosmogator Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug 2019 at 2:08am
Can't edit post, sorry. Second pic should be this one -
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Botvinnik View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Botvinnik Quote  Post ReplyReply Direct Link To This Post Posted: 29 Aug 2019 at 12:58pm
Prime small FFT especially newer version push the VRM and CPU too hard.
Did you look at current IOUT ? 184-187A is very close to limit.
Max safe current for 9900K is 193A and that is not for sustained run.

Solution : use Prime 95 26.6 with fixed 1344K or ASUS realbench instead.
With these test my Z370 taichi got 90C VR loop 1 temperature. Put small fan blow over VRM heatsink and it never exceed 63C even ambient temperature at 34C.
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Cosmogator View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Cosmogator Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug 2019 at 3:20am
Sure I have Realbench. And I don't want to use this prime95 for 24 hours, as some overclockers suggested. Still I need it as one of stability tests for overclock. Prime95 26.6 obviously less demanding - but it won't offer AVX, as far as I know. And I need it for a proper AVX offset. I didn't complete enough tests - because of VRM, mostly. But, roughly, without AVX my CPU can work at 5.0GHz (mb 5.1), while with AVX - only 4.9.
Sure - there is LinX. I use 0.7.0 version. It will heat VRM up to the 110 C as well - not so fast, though. I shouldn't use it too, then?
If I can't stress test my system - then, well, I should consider it unstable and must not use it with a serious applications. With a fan blowing to the VRM I can test it - but I dont know if these temperatures will affect voltage stability, or something else. Mb I can overclock higher without VRM overheating.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Botvinnik Quote  Post ReplyReply Direct Link To This Post Posted: 30 Aug 2019 at 1:36pm
Once I pass 26.6 1344K for 10 minutes. Yes only 10 minutes. I can use heavy programs like Adobe Premier Pro and V-Ray / Lumion without issue. Those programs utilize AVX and I didn't touch AVX offset. Also I never get BSOD or WHEA error in HWInfo64.

Those programs use the same amount of current and power like 26.6 1344K and Realbench.

For rendering I need 1.3V + LLC 1 for 9900K 5Ghz (VR VOUT which is real voltage is 1.23-1.24V)
Gaming only need 1.265V set in BIOS.

Lin X 0.6.4 is fine. 0.6.5 and higher use AVX and stress CPU / VRM too much just like P95 new version + small FFT. Even tiny voltage like 1.2V can be unsafe because current will go skyrocket. Remember it is current that kill CPU. Voltage and heat just damage it in the long run.
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