Vrm Spread Spectrum

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Dark Hero, VRM spread spectrum?

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axiumone

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I'm trying to figure out what is causing the bus clock behavior in the screen shot. From what I understand, this can be caused by having VRM spread spectrum enabled in the bios, but the Dark Hero doesn't seem to have that option anywhere. What needs to be changed in order for the bus clock to be closer to the default 100?

I've tried setting it manually in a range of 99-102, but that hasn't made any difference.

Rolda

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It is not a VRM spread spectrum. It is an SB clock spread spectrum.
You can find it in Tweaker's Paradise. Switch it to disable.

axiumone

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Gotcha, thanks. SB spread spectrum is disabled in the screenshot. it seems to have no effect on my end.

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Can't seem to find much information about it on Ryzen. This used to be one of the first things to disable when overclocking. Is it an issue anymore or do you actually gain anything anymore when disabling it? I can't seem to find any difference when disabling or leaving on auto.
BIOS does recommend disabling it when overclocking though.
Disable it and don't worry if you are overclocking
Yea.. gonna leave it disabled. Thanks anyway.
Worth mentioning, VRM Spread Spectrum is not the same thing as Base Clock Spread Spectrum.
Base clock controls are hidden in many bioses.
VRM Spread Spectrum manipulates the switching frequencies of the VRM. May be worth doing.

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For how easy it is to build a computer, we often don’t appreciate the electrical engineering that takes place to make that happen. For example, how does the motherboard manage the way your CPU gets power? Through a Voltage Regulator Module (VRM). But what is a VRM and how does it affect your CPU performance? Here we answer those questions.
Your motherboard’s VRM is a crucial but underappreciated series of electronic components that ensure your CPU or GPU receives clean power at a consistent voltage.
A poor VRM can lead to degraded performance and limit a processor’s ability to function under load. It can even lead to unexpected shutdowns, especially when overclocking.
A VRM’s first job is to convert the 12-volt power from your computer’s power supply down to a usable voltage. For processors, this is typically between 1.1V to 1.3V. The delicate electronics inside can be easily shorted by too many volts. Precision is also crucial when powering a processor, and the required voltage must be delivered as exactly as possible. That’s why VRMs are more complex than a simple piece of wire. But at their heart they are basically a buck converter, precisely stepping down voltage to appropriate levels.
The VRM uses three components to do its job: MOSFETs, inductors (also called chokes), and capacitors. There’s also an integrated circuit (IC) to control it all, sometimes called a PWM controller. A simplified schematic of a single-phase VRM can be found below.
A more detailed discussion of each component’s function can be found on WikiChip’s VRM page .
Modern computers require more than a single phase VRM. Modern power systems use a multi-phase VRM. Multiple phases spread the power load over a broader physical area, reducing heat production and stress on components as well as providing other electrical improvements related to efficiency and per-part costs.
Each phase of a modern multi-phase VRM supplies a fraction of the power required, taking turns to provide power to the CPU. Taken individually, each phase provides a brief moment of power, visualized as a square-shaped wave.
Each phase’s burst of power is staggered from the last, so that while only one phase is operating at a time, the total amount of power never changes. This, in turn, produces a smooth, reliable power source – the “clean” power required for a CPU to function optimally. You can see a simplified system in operation below.
VRMs are typically sold as something like “8+3” or “6+2.” The number before the plus indicates the number of phases dedicated to cleaning power for the CPU. The number after the plus indicates the VRM phases left to power other motherboard components like RAM.
When the first number is greater than 8, such as “12+1,” “18+1,” or even higher, the manufacturer often makes use of a device called a doubler. A doubler allows them to multiply the benefit of the existing phases without building additional phases into the board. While this isn’t quite as effective as wholly separated phases, it does allow for some electrical improvements at a lesser cost. And since it allows manufacturers to raise a buyer-facing number at small expense to themselves, they often take advantage.
The goal with a VRM is the provision of clean and reliable power. Yet even a basic VRM can deliver sufficient performance to maintain a mid-range CPU at stock speeds. When overclocking or pushing component limits, the quality of the VRM becomes more important.
Overclockers should seek out a VRM made from reliable components. If its components are cheap, they may fail to supply sufficient voltage under load, causing surprise shutdowns. The most variable components are capacitors and chokes.
Look for leak-resistant capacitors. These are often marketed under names like “Japanese Capacitors,” “Dark Capacitors,” or “Solid Capacitors.” High overclocks will require better chokes as well. You can find this named as super-ferrite chokes (SFCs) or “Premium Alloy Chokes.” Also look for heatsinks over some or all MOSFETs – finned, if possible.
Additionally, those who are using higher-powered CPUs, like Threadripper CPUs, should ensure that they’re getting a good-quality VRM on their motherboards. Many manufacturers are prepared for Threadripper in this respect, but with CPUs that power hungry, it’s super important to make sure you can get clean power as often as possible.
Even with knowledge, it can be difficult to shop for a capable VRM. Cost is little guide, and marketing material, as mentioned, can be intentionally misleading. Detailed information about component and part numbers is rarely revealed to consumers. It is best to do your own research before you get one.
If you enjoyed this writeup on VRM and how it can affect CPU performance, make sure to check out some of our other hardware content, like our guide on prioritizing upgrades for your PC , or our writeups on vsync and screen resolution before you buy your next monitor.
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