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5000 Series Undervolting
- Thread starter The Asgard
- Start date
All chips are different and it’s about finding the cpu sweet spot. Have you tried disabling PBO limits and using CO settings?
Trying a CO with an all core offset of -5 is pretty simple. Just nudge the setting every few days if it’s stable. I don’t think it can get any simpler.Still running my 5800x same settings since January, stock was way too hot.
Current settings, 4.6ghz locked all core at 1.25v. Very cool quiet and simple, PBO and other stuff turned off. Curve optimizer too much effort for me
It's still way hotter and spikes to 1.4v
Associate
It's because curve optimiser is naff. It's sold as an 'undervolt', but in reality it's just a plain overclock. When the CPU boosts it will request ~1.45v and set whatever the maximum frequency it can, up to the boost limit. For most CPUs, they can't sustain the boost limit (they spike to it briefly, but not sustain). So curve optimiser results in a net frequency increase, but no voltage reduction. IMHO, that's not an undervolt.
On a 5950X I observe CPU temps that are 8C higher with curve optimiser at -20/-30 vs when it's disabled (but PBO still enabled). CPU power is +25-30 watts higher with CO on. I just use fixed overclocks myself too now. Seeing some good results with 4575 MHz at 1.175 V and CPU temps are pretty nice indeed
Waiting on my 5950x, I have all this fun to come.
My current 3800x has been heating my room for sometime so I’m looking forward to the new system for a chance to get things cooler this time around.
Expect the 3800x will go in my sons 1700x system. He already has the system to support it, just dropped my old chip in there over a year ago.
My current 3800x has been heating my room for sometime so I’m looking forward to the new system for a chance to get things cooler this time around.
Expect the 3800x will go in my sons 1700x system. He already has the system to support it, just dropped my old chip in there over a year ago.
There is a lookup table just like the VID that gives you a per core voltage for a given frequency. The voltage supplied at a specific frequency is offset by the value. This is an undervolt. You can boost higher because less heat is generated for a given frequency.It's because curve optimiser is naff. It's sold as an 'undervolt', but in reality it's just a plain overclock. When the CPU boosts it will request ~1.45v and set whatever the maximum frequency it can, up to the boost limit. For most CPUs, they can't sustain the boost limit (they spike to it briefly, but not sustain). So curve optimiser results in a net frequency increase, but no voltage reduction. IMHO, that's not an undervolt.
On a 5950X I observe CPU temps that are 8C higher with curve optimiser at -20/-30 vs when it's disabled (but PBO still enabled). CPU power is +25-30 watts higher with CO on. I just use fixed overclocks myself too now. Seeing some good results with 4575 MHz at 1.175 V and CPU temps are pretty nice indeed
It’s definitely not Naff.
Have you tried using a negative offset, this is not CO?
That's better than a fixed voltage because you get the benefit of reduced voltage a low frequencies which should run cooler and use less power. Just adjust the negative offset to give you a 1.25V load voltage. You might have to throw a bit of LLC love in there but should be easy. You certainly have some options if you don't mind playing with a few settings. This is old school Intel stuff.
Soldato
Are you still using these settings on the B450 Tomahawk with the 5900X? I've got the same kit but it's been a long time since I ventured into doing this sort of stuff so any help appreciated.
Associate
No sorry bud, mb got sprayed with fan bearing oil so has been replaced with a different make and model, found that the tomahawk max b450 fed more power to the CPU than my new one as well.
I enabled advanced PBO, set PBO limits to disabled. I think I ended up setting a negative co of -20 on two best cores (as shown in Ryzen master), --15 on next two and -10 on the rest to get it stable.
I removed my negative voltage as what I gained in multi threaded performance I lost in single thread so left LLC stock.
Associate
Set up my fan curves last night, just popped +200 on PBO and -5 all cores, looking good so far, around 5% single 1-2% multi increase in Cinebench R23 at same temps.. will leave it how it is for a day or two and then try -10
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Associate
Finally got around to doing my CO, managed -20, -15, -15, -30 -30 -30 with no boost, well worth it for a 5% performance hit as PC now runs cool and quiet when gaming
Total package power with PBO at 200 was 113W, Cores 79.9W !
Total package power with PBO at 200 was 113W, Cores 79.9W !
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Negative curve should be same or increased performance, not reduced.
Or is that compared to PBO+boost?
Associate
Yes, vs PBO +200 (previous post).
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Had a crack at this last night, 5600X PBO on +200Mhz, CO all cores set to -10, PPT = 76, TDC = 60, EDC = 90, seems to run perfectly well in stress test all cores pegged at 4760Mhz, CPU temp reached 70°C and levelled out (single core hit 4850Mhz). Nice little bump in performance without anything getting to toasty. Almost too easy, unless I'm missing something.
Soldato
- Joined
- 9 Jun 2011
- Posts
- 3,598
1.18v 5950x 4.55ghz all core 80c cinebench 10 min under NHD15, will test lower