Page 12[Overclocking and Power Consumption]
Ryzen CPU Overclocking
The 1800X and 1700X features XFR, or eXtended Frequency Range. The 1000+ sensors in the CPU allow for the CPU to overclock itself to a maximum of 4.1GHz (on the 1800X). A single core can go above its 3.7GHz boost limit (all cores run at 3.7GHz), to 4.1GHz.
AMD is working on expanding this range in the future, but for now, it's 4.1GHz. AMD's CPU multiplier can increase in 0.25x increments.
ASUS's UEFI has built in profiles under overclocking presets; I just decided to use DOCP, which is AMD's version of XMP. It brought the DDR4 multiplier to 2933MHz and set my timings as per the kit's SPD. I should mention that the platform likes DDR4 to run at T1 and that you are going to hit your daily limit around 3000MHz, you need very good memory to go higher and a motherboard to match (like this one).
I then set the core ratio to 40x. The VCore to 1.45 (recommended maximum, but try to keep around 1.4v) and SOC to 1.162 (maximum is around 1.2v for daily use). VCore is useful for core overclocking, while SOC can help both core and memory. You also need to set your DDR4 voltage if it isn't already set by DOCP.
On the left are our results at stock and on the right, we have overclocked the CPU to 4GHz on all cores and the memory to 2933MHz. The overclock you see here is the maximum of most first generation 1800X, at least from what I can gather, when overclocking all cores. AMD recommends trying to disable cores and overclock higher as you will see below.
AMD's Ryzen Master is their overclocking software, similar to WattMan for AMD GPUs. Every time you use the software, you must agree to the terms. It's an easy to use GUI with a really nice look and feel to it. You must change the profile from current "C" to one of the other four profiles to make changes. The software has a setting called "Cores Disabled, " and it's where you can disable pairs of CPU cores to achieve higher overclocks on the other cores.
HPET must be enabled to use the software. I also read a bit of the ReadMe for the program and came across this part. It states a few interesting things. For starters, AMD is adamant the CPU will overclock higher with fewer cores and explains the benefits to disabling cores. I also read, "the Ryzen processor operates all cores at the same operating frequency," which would hint that we can't stagger the overclock so that some cores operate at lower frequencies than the others like XFR does.
AMD did tell us during their OC session (where they overclocked memory to 3600MHz on air and a CPU to 4.1GHz on all cores), that they would be improving overclocking as time goes on. For now, taking all cores to 4GHz provides a good boost in performance.
Ryzen Power Consumption
So, I have a handy device that measures CPU power consumption separately from that of the rest of the system. I also measured power consumption at the wall to get total system power consumption.
You need to keep in mind that the Ryzen CPU is a SoC with a lot of extra IO compared to the Intel processors.
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- Page 1 [Introduction, Specifications, and Pricing]
- Page 2 [The New Microarchitecture]
- Page 3 [The CPU, Platform, and Test Setup]
- Page 4 [Out of the Box Performance: CINEBENCH, wPrime, and AIDA64]
- Page 5 [Out of the Box Performance: Handbrake Video Transcoding, ScienceMark, and SuperPI]
- Page 6 [Out of the Box Synthetic Gaming Performance: UNIGINE and 3DMark]
- Page 7 [Out of the Box Gaming Performance: Resident Evil, Tomb Raider, GTA:V, Ashes of Singularity]
- Page 8 [Clock for Clock Performance: CINEBENCH, wPrime, and AIDA64]
- Page 9 [Clock for Clock Performance: Handbrake Video Transcoding, ScienceMark, and SuperPI]
- Page 10 [Clock for Clock Synthetic Gaming Performance: UNIGINE and 3DMark]
- Page 11 [Clock for Clock Gaming Performance: Resident Evil, Tomb Raider, GTA:V, Ashes of Singularity]
- Page 12 [Overclocking and Power Consumption]
- Page 13 [What's Hot, What's Not & Final Thoughts]