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post #3091 of 3370 (permalink) Old 04-16-2019, 04:44 AM
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post #3092 of 3370 (permalink) Old 04-16-2019, 08:21 AM
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I just got my build up and running and was hoping to get a stable 5GHz clock going. I followed Gigabyte's 5GHz overclocking guide, but Prime95 just nukes my computer no matter what I do. In Blender, I can benchmark indefinitely at 1.33v and never get above 83C on any core. With LLC on Auto, I BSOD at any vCore. On Turbo, the temps jump very high very quickly on basically any vCore, even as low as 1.29v. On Prime95, I get uncomfortably high temps (over 100C) on two of the cores before I stop it. On lower Vcore, I BSOD after just running Prime95 for just a few minutes bit. At stock clock settings, I even get up to 90c in Prime95, which is ridiculous for a 360mm radiator. Is there anything I can do, or did I just lose the silicon lottery? It doesn't appear to do any thermal throttling, it just does a hard shutdown when it hits TjMAX.

Build:
Intel i9 9900k
Aorus Master Z390
Corsair H150i with stock ML120 1600RPM fans
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post #3093 of 3370 (permalink) Old 04-16-2019, 08:56 AM
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Quote: Originally Posted by RynoW View Post
I just got my build up and running and was hoping to get a stable 5GHz clock going. I followed Gigabyte's 5GHz overclocking guide, but Prime95 just nukes my computer no matter what I do. In Blender, I can benchmark indefinitely at 1.33v and never get above 83C on any core. With LLC on Auto, I BSOD at any vCore. On Turbo, the temps jump very high very quickly on basically any vCore, even as low as 1.29v. On Prime95, I get uncomfortably high temps (over 100C) on two of the cores before I stop it. On lower Vcore, I BSOD after just running Prime95 for just a few minutes bit. At stock clock settings, I even get up to 90c in Prime95, which is ridiculous for a 360mm radiator. Is there anything I can do, or did I just lose the silicon lottery? It doesn't appear to do any thermal throttling, it just does a hard shutdown when it hits TjMAX.

Build:
Intel i9 9900k
Aorus Master Z390
Corsair H150i with stock ML120 1600RPM fans
Nvidia 780Ti
Corsair 750W PSU
Are you running prime95 with SSE2 (AVX disabled) or with AVX/FMA3 small FFT's?

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post #3094 of 3370 (permalink) Old 04-16-2019, 09:04 AM
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With AVX/FMA3 small FFT's. (27.9 Build 1)
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post #3095 of 3370 (permalink) Old 04-16-2019, 10:41 AM
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Quote: Originally Posted by RynoW View Post
With AVX/FMA3 small FFT's. (27.9 Build 1)
Unrealistic test. Don't bother with that.
You're not going to be able to cool that chip unless you delid it and go 360 rad water.
You can't cool 180 amps of current on your cooling system.

Disable AVX2 and AVX in 29.8 build 1 (current version) and test that.
For AVX testing, you can do:
1344K in place fixed AVX (if hyperthreading is OFF).

Realbench 2.56 (HT on).
Cinebench R20 3600 seconds custom (HT On).

Prime95 two processes in two folders:
1) 14 thread smallest FFT (AVX2 and AVX disabled)
2) 2 thread custom AVX FFT (512K - 8192K FFT range), RAM to use: 5628 MB.

This will test your system without making the load unrealistic.

[email protected] ghz, RX Vega 64, 32GB DDR4, Gigabyte Aorus Master, Seasonic Platinum 1000W, Corsair 760T
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post #3096 of 3370 (permalink) Old 04-16-2019, 11:19 AM
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Quote: Originally Posted by Falkentyne View Post
Unrealistic test. Don't bother with that.
You're not going to be able to cool that chip unless you delid it and go 360 rad water.
You can't cool 180 amps of current on your cooling system.

Disable AVX2 and AVX in 29.8 build 1 (current version) and test that.
For AVX testing, you can do:
1344K in place fixed AVX (if hyperthreading is OFF).

Realbench 2.56 (HT on).
Cinebench R20 3600 seconds custom (HT On).

Prime95 two processes in two folders:
1) 14 thread smallest FFT (AVX2 and AVX disabled)
2) 2 thread custom AVX FFT (512K - 8192K FFT range), RAM to use: 5628 MB.

This will test your system without making the load unrealistic.
And if Hyperthreaded-Technology is on?

Intel Core i9 9900K HT 5GHz
GIGABYTE Z390 Ultra
AMD ASUS STRIX OC VEGA 64
G-Skill Trident 2x8GB DDR4 4000MHz
Samsung EVO NVM.e 250GB
SeaSonic 1250W Gold
Corsair 900D + Custom Loop.


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post #3097 of 3370 (permalink) Old 04-16-2019, 12:49 PM
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Quote: Originally Posted by BradleyW View Post
And if Hyperthreaded-Technology is on?
Hyperthreaded AVX threads with FFT sizes > 112K will compete for memory and wind up jumping all over each other, completely ruining the point of the test. Your amps draw with 16 AVX HT threads at 1344K will be -much- lower than the same test with AVX disabled!

If HT is off, then AVX enabled and disabled 1344K will have close to the same power draw on an 8 core processor.

Note: AVX can only access as many memory channels as your processor has. 9900K (heck, all of the Skylake non HEDT chips) only have 2 memory channels. That's why if you test FFT sizes < 128K, the power draw goes through the roof, because the AVX threads are no longer competing for memory access. Thus none of this applies to FFT sizes 4k to 112K, since now the threads stay within the L2 and L3 caches, without being bottlenecked by main memory's 2 channels.

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post #3098 of 3370 (permalink) Old 04-16-2019, 02:43 PM
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Quote: Originally Posted by Padinn View Post
Where is this dummy load setting found?
Dummy load is for old PSUs that don't support low voltage C6/C7-states.

i5 8600K OC 5.0GHz
Noctua NH-U14S
Motherboard Gigabyte Z370-HD3
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post #3099 of 3370 (permalink) Old 04-16-2019, 04:45 PM
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Quote: Originally Posted by Falkentyne View Post
Unrealistic test. Don't bother with that.
You're not going to be able to cool that chip unless you delid it and go 360 rad water.
You can't cool 180 amps of current on your cooling system.

Disable AVX2 and AVX in 29.8 build 1 (current version) and test that.
For AVX testing, you can do:
1344K in place fixed AVX (if hyperthreading is OFF).

Realbench 2.56 (HT on).
Cinebench R20 3600 seconds custom (HT On).

Prime95 two processes in two folders:
1) 14 thread smallest FFT (AVX2 and AVX disabled)
2) 2 thread custom AVX FFT (512K - 8192K FFT range), RAM to use: 5628 MB.

This will test your system without making the load unrealistic.
Running these tests, my system appears stable at 5GHz 1.27v, and I might be able to go even lower voltage. Temps in non-AVX Prime95 peak around 90c*. Cinebench and Realbench peaked a few degrees lower. My only question now is, why does Gigabyte recommend doing the AVX torture test in their guide?


*Temp is from CoreTemp, for some reason HWiNFO64 reads all the temps significantly lower, peaking at 80c. Anyone else experience a discrepancy like this?
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post #3100 of 3370 (permalink) Old 04-16-2019, 04:54 PM
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Quote: Originally Posted by RynoW View Post
Running these tests, my system appears stable at 5GHz 1.27v, and I might be able to go even lower voltage. Temps in non-AVX Prime95 peak around 90c*. Cinebench and Realbench peaked a few degrees lower. My only question now is, why does Gigabyte recommend doing the AVX torture test in their guide?


*Temp is from CoreTemp, for some reason HWiNFO64 reads all the temps significantly lower, peaking at 80c. Anyone else experience a discrepancy like this?
Coretemp is obsolete. Everyone uses HWinfo64 now. Also make sure you are reading the correct sensors.
Also make sure you use the DTS sensors, not the motherboard reported CPU temp. HWinfo will report both CPU package temp and "motherboard" CPU temp, which is usually 10C lower. Both the 80C and 90C temps should be shown in HWinfo64. (the 80C is Tcase measurement, not accurate).

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