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Does Undervolting Improve Radeon RX Vega 64's Efficiency?
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Undervolting AMD cards tend to yield a lot of good results for them. My RX undervolted maxes out on 76c on full load and around w avg consumption.
Stock settings the thing would hit c easy and consumes around w or so watts. Frame rates improve a bit as well undervolted too from my experience. Try it out and you might like it. I'd take cooler and lower power consumption over overclocking anyday for AMD cards. PLSG08 said:. You must log in or register to reply here.Again, we're using The Witcher 3 at 4K for our worst-case scenario.
This yields an average of Not bad. Conversely, pushing the card to its limit via overclocking gets us almost MHz and From the lowest to the highest average clock rate, we observe an increase of However, gaming performance goes up by just That's not great scaling, but it's not terrible either.
What's more important is the power consumption accompanying those numbers. Unfortunately, this is where the data gets ugly. Compared to the stock settings, just Going back to a worst-case scenario, the overclocked card averages Trading The efficiency curve drops off rapidly with increasing clock rates and the additional power those frequencies necessitate.
Almost double the power consumption for one-fifth more gaming performance is what we'd call catastrophic. The point at which the distance between both curves is at its greatest represents the so-called sweet spot.
This is where the card operates at peak efficiency, right before it starts going the other direction. The temperatures are very similar across all six power profiles.
This is due to the fan's aggressive controller, which responds quickly when power consumption increases. For each of the two BIOSes, we provide thermal images for all three driver-based profile settings. As mentioned, though, all of the temperatures are fairly similar until we get to the overclocked configuration.AMD Radeon RX VEGA 56 - Mehr Power endlich über den MSI Afterburner
We start with the underclocked settings, resulting in W of power consumption. At that level, we notice a deviation from the six driver profile-based average temperatures as well. Similar to what we observed from the primary BIOS, the other temperatures increase only slightly as power consumption rises; they're kept in check by an especially responsive fan.
Home Reviews. Image 1 of 4. Image 2 of 4. Image 3 of 4. Image 4 of 4. See all comments What a crock! I didn't realize that Tom's hardware pandered to the iNvidiot's. Good job AMD, hopefully next gen you can make more headway in power efficiency.
But this is a good card, even beats the factory OC Thanks for the hard work and in-depth review -- any word on Vega Nano? Some 'Other Guys' Namer Gexus? No undervolting tests? It's 4am here at the party We've seen what they can do in a factory blower configuration. Are board manufacturers allowed to take 64 and 56 and do their own designs and cooling solutions, where they can potentially coax more out of it power usage aside?
Or are they stuck with this configuration as Fury X and Fury Nano were stuck?Does undervolting improve efficiency, then? Yes and no. If you increase Radeon RX Vega 64's power limit, then yes. If you don't, then no. It's only by raising the card's power limit that the telemetry can identify voltage as a limiting factor and optimally adjust the resulting clock rate to the actual graphics load. The result barely exceeds the default Balanced mode, though. Conversely, manually decreasing the voltage to 1.
All of our measurements were taken while using a game to generate the load.
Undervolting Vega 56
The game in question was selected because it produces a constant and reliable load across the entire duration of 30 minutes. We did run Doom as well to check our results, and it demonstrated higher frequencies and lower power consumption. Our bottom line stays the same. In that case, the reduction in voltage becomes just one more limiting factor among many others, such as temperatures. Each card is going to have its own boundaries that you'll have to experiment with, since every GPU's quality is different.
Even though there we don't have anything sensational to report when it comes to undervolting, an additional 20W or seven percentdoes produce five percent more performance. This means that the card scales really well, and certainly a lot better than when it's run at at stock settings without lowering voltage.
In that case, 41 percent more power consumption gets you just 11 percent-higher frame rates. Consequently, if you want to overclock efficiently, then you need to undervolt. It would be great if AMD could handle temperature readings in a more precise manner. Documentation would also be appreciated. Our advice is to use a suitable tool, such as GPU-Z, to read the hot-spot temperature. Topics AMD. See all comments Good article, thanks for the analysis!
Or is there just whatever is included the various Polaris 10 review articles e. RX review? If it's the latter, does anyone know which review would contain the most information regarding ths? I don't think this article went in-depth enough.
Which is tremendous IMO. Maybe it's too early in the morning for me, but I'm a little confused about what we actually found here. Under the condition of using a somewhat absurd cooling solution. So are we to infer that with an air cooled card, undervolting in and of itself is not desirable, but is likely to help more than it hurts because we run out of thermal headroom before the lower voltage becomes a limiting factor? Thanks for all the bench work and reporting.
That's certainly not at the top of the list of many Tech Heads but gives AMD better insight going forward as they bake new wafers, fix bugs and tweak the arch. There's a thread at Overclock pushing pages!
Manipulating volt tables is becoming an art I still can't comprehend how there are so many engineering issues going on with the design of VEGA, as well as the continued challenges in how to optimize an overclock.
You'd think in you could just tell the computer to figure out the optimal overclock.Menu Menu. Search Everywhere Threads This forum This thread. Search titles only. Search Advanced search…. Everywhere Threads This forum This thread.
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Jun 4, 13, 6, Justinbaileyman said:. So is Vega 64 the card to get right now? Also I could be crazy here, but I could have sworn some one said there is a 16gb version?
Would this be the best card or doesnt it matter? Sep 1, 3, The price on them has come down a lot so if you're still in the market for one it's much more forgiving now. I may actually scoop a liquid card at some point but I'll most likely hold off for a bit. Justinbaileyman Golden Member. Aug 17, 1, First off, Thank you guys for the very fast replies!! I plan on playing at p for now but want to do 4k in the very very near future.
I also watch a lot of movies so which ever card I get will have to be able to support up to 4k blu-ray standards and have HDMI 2. I was all set to grab the Gigabyte or Red Devil Vega 64 but after watching a crap load of video reviews I am unsure what to do now.Log in or Sign up. My question is: why undervolting improves performance?
Dener de Paula PereiraSep 25, I've had about Vega cards. One was a serious dud and couldn't undervolt to save its life. Thats probably why. GeniusPr0Sep 25, GlennBSep 25, Reports since Thus monitoring via HWInfo or other program and getting data outside of Wattman itself for what the card is doing.
Or what it's drawing I suppose ha ha, well hopefully that's resolved. And then whatever limits apply, some users get a even when downclocking the cards and others can go up to almost on voltage while also barely having to lower clock speeds at all though depending on Vega 56 or Vega 64, memory clocks and type the overall performance impact from actually lowering clock speeds isn't much or even noticeable at all until you drop it to more significant values though I believe this changes a bit with the Radeon VII although it's also using the more free states and scaling rather than the prior use of the P state same as Navi and likely later cards.
These do undervolt too and much the same so it's very possible to hit to mv though again it depends on the GPU as everyone will behave a bit different plus overclocks or underclocks and again it doesn't have to impact performance in any perceivable way or by a very small amount for the reduction in voltage and temps and overall resulting power draw. Would have been nice if the GPU's could have been 1.
With this I repeated almost the exact same procedure too, from a silly Mhz mv what it was boost it could never realistically hit down to Mhz at mv and complete stability after eight hours of testing and performance only hitting a mild drop for the gains in junction and core temp plus memory up from to Mhz which isn't much but the cards are sensitive and early drivers could be prone to errors or other issues so keeping it here for now.
Memory might show crashes or artifacts or just a performance drop or stop scaling so it needs careful testing, core clocks and boost still hit around 2Ghz by default and this keeps it within a similar range just a tad lower thus the performance is fairly similar though the card has bit more reach than the Vega for overclocking a bit further if users would want to.
Well it can but I'd say the stock settings were kinda pushing it already for this card and what it positions itself as, Nitro and the Devil might be a tad more flexible but settings and overall limits are still what they are. EDIT: Well memory sensitivity goes for Vega too and HBM2 but it mostly showed graphical glitches or corruption as long as smaller increases and testing and re-testing were done before it got crash happy and it also showed gains in performance due to Vega at least until Vega20 and VII improved the situation a bit due to bottlenecking but due to Hynix and Samsung types it could differ a bit what was achievable plus 56 voltage and 64 at a slightly higher memory voltage.
Still capped though despite Wattman saying memory voltage but it operating as a different parameter entirely for some earlier P state and possibly overall voltage minimum or voltage floor not memory but for GPU core. So yeah regardless AMD is still kinda pushing the settings and voltge but it does allow every GPU to hit parameter specs and at least it's easy and flexible enough to be lowered down a notch and might not affect performance at all but sheering off in the hundreds feels a bit funny but eh it's a thing and it's pretty useful if the card is showing no issues with a nice reduction here plus lowering temps and power draw and improving core temps at least a little bit.
And per the first paragraph it just varies from card to card so some hit higher undervolt results and others might not allow for as much of a decrease because silicon lottery and binning is a thing so every single chip is going to come out a bit different even if the variance doesn't have to be very big it can still affect overall parameters by at least some margin. And the cards are pushed quit close to the limits already for clock speeds though there's room for both underclocks and overclocks and voltage adjustments too.
Last edited: Sep 26, JonasBeckmanSep 26, Dener de Paula Pereira and OnnA like this. Dener de Paula PereiraSep 30, Pretty sure it only allows for the card to draw more power if it needs to without throttling but then that also counters the under volt a bit by having it draw more from the PCI and if it doesn't need more power than stock there's no need to increase the slider at all.
With the newer drivers it might also try to boost or push above the specified settings and boost or have small spikes so that might affect the behavior of this setting too if it keeps pushing higher clocks because there's additional headroom before the GPU starts throttling which includes the power limit although I would keep the slider here on stock as it's mostly from the default setting it even hits the default threshold and starts throttling.
And the "hot spot" temp is going to be a bit above that and then it's throttling around to Celsius but the usual GPU temp sensor won't be in the 's or anything just because the hot spot is climbing near 90c or where it might end up at during heavier operations and full GPU load. That's a bit extra though, benchmark and test the card under the settings and something like GPU Z or HWInfo can be used to see other sensor information if needed though temps and performance and of course stability also works really well for measuring how the new settings are doing and from there it can be fine tuned further.
EDIT: Vega having some cards hitting 1. EDIT: Think the default p7 state I had for the Pulse Vega 56 was Mhz or Mhz so trimmed it down a bit and then increased it slightly landing at Hz It always rounded up that last 2 for some reason. And adjusting anything if needed. Last edited: Sep 30, JonasBeckmanSep 30, Dener de Paula Pereira likes this. You must log in or sign up to reply here.Menu Menu.
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May 11, 18, I have undervolted my rx 8 GB since the beginning that i bought it and now with the performance overlay i was keeping track of the power consumption while playing prey Radeon chill is off. This is with vsync on at 60Hz while playing prey Constant 60Hz with the exception at the beginning of the level while loading.Forums New posts Search forums. New posts What's new Latest activity New profile posts. Members Current visitors New profile posts Search profile posts.
RX Vega 56 Tuning for Efficiency. Joined Nov 23, Messages 38 0. Hello guys and girls, long time lurker and decided to finally create an account and post my first thread. However yesterday while playing Hellblade Senua's Sacrifice first time I really stressed the card for some time I got some crashes. Caused by my 3D device aparently Last edited: Nov 23, Joined Mar 18, Messages 5, 1.
Pretty good work. Very true xkm Had a Rx before and it was a lot easier to tinker with. This way, however, RTG found a way to maximize performance in most use cases, something good for most people. Joined Dec 27, Messages 0. Really nice work! My friend has just bought a laptop with a full size Vega 56 card in it, so hopefully the GPU will be running at similar clock speeds.