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Positive voltage offset for 3900x?

 
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post #1 of 7 (permalink) Old 11-11-2019, 10:37 AM - Thread Starter
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Positive voltage offset for 3900x?

Running x470 Taichi with Noctua NH-D15 on the 3900x. I tried undervolting all the way down to -0.087v. I went down on max boost which was 4.600MHz.

Now I figured I would try a slight positive offset of +0.0125v and I gained about 50MHz. My 3900x tops out at 4.650MHz and 1.506v. Running PBO with +200mhz, scaler at x10, rest auto and just the positive offset.

I also see 4.350MHz to 4.375MHz while gaming instead of 4.300MHz with auto vcore offset.

So how far can I take the positive offset and whats the max safe voltage and temperature for long term use?

I usually just game, watch movies etc... Normal tasks with this voltage I top out at 70c. I rarely push this processor to 100% load. I'm using latest beta bios 3.74 for the x470 Taichi.
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post #2 of 7 (permalink) Old 11-12-2019, 06:44 AM
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I think these CPUs are already at their voltage wall and wouldn't think adding voltage would be worth the minor MHz gain.

If you can keep it cool and don't care for the risk then I would go for it if you see an improvement. But gaming at 1440p won't show much benefit. PBO might push the all core higher as an alternative, but I'm still unsure if PBO voltage is 'safe'. Perhaps a more seasoned user might have the answer.

Sounds like you should have got a 3800X though as they are the best Ryzen gaming CPUs. But at least you are future-proofed

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post #3 of 7 (permalink) Old 11-12-2019, 06:52 AM
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1.5 volts is way too high in my opinion. I have a 1700x and won't go past 1.4v and that is 14nm also I have the same cooler as you so temps aren't an issue for me. I would think that 7nm would be more sensitive to voltage and would definley try to back that down to below 1.4volts.
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post #4 of 7 (permalink) Old 11-12-2019, 02:14 PM - Thread Starter
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I thought ryzen 3000 cpus could hit 1.5v during single core loads. Also whats the max safe temps? During 100% load I can hit 80c but during gaming most I hit is 70c but it looks like I stay around 55-65c while actually playing.
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post #5 of 7 (permalink) Old 11-12-2019, 07:48 PM
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I mean I am sure they can I just wouldn't feel comfortable with running that voltage 24/7. Your temps seem ok maybe a little high but nothing that will hurt anything. If you can keep your temp below 75c your cpu will turbo higher in high load situations.
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post #6 of 7 (permalink) Old 11-18-2019, 02:03 AM
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They don't hit that voltage 24/7, only in lightly threaded low current situations do they hit 1.5v. Also I suspect they're applying a +0.02v offset or more to wake idle cores in a c state.
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post #7 of 7 (permalink) Old 11-23-2019, 11:23 AM - Thread Starter
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Well I've been running max voltage of 1.506v for daily use. Basically using a +0.012 offset. Rarely hit 70s during normal use. Going to stay with that for time being and see if I can tighten up the ram.

I know the pic shows 1.512v but I've bumped it down and still see same clocks.
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