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Ryzen 3xxx series, 3500 and better
Ryzen 5xxx series, 5600 and better
can all AUTO Turbo Boost in a fully dynamic fashion based on Thermals.
Its the Ryzen older then these, or ones like Ryzen 3100, 3200G, 3400G that can't do this.
All those have is a pre-set Turbo Boost, which it can't go above unless the user attempts to Manually OC. With the newer Ryzen CPUs such as 3600, you never need to manually OC, it does it all on its own. HOWEVER, you want the updated non-Beta BIOS, as well as the very latest Ryzen Chipset Drivers from AMD.com in order for this to work.
Maybe it's holding boosts longer, more frequently, or actually is going higher, and maybe there is a small performance difference at times and I'm not noticing it, but... it's not like "Ryzen doesn't like being over 80C and will kill your performance if you do". At least, that's not been my experience.Like Escorve said, yes. It's pretty standard now for CPUs from Intel and AMD to "boost" themselves higher than their stock and base clocks. Intel calls it "Turbo Boost". How high it boosts depends on a lot of factors (number of cores under load, current draw, temperature, etc.). With modern CPUs more and more and ESPECIALLY with Ryzen, it boosts so close to its limits that this is where the "there's almost no point to overclocking on AMD" comes from. Modern CPUs more or less do it on the fly themselves now.
I also have a theory (that I can't prove because I don't have another system with a crap motherboard to test it) that it can happen if your motherboard's VRM are insufficient for powering your CPU at its factory configuration. For instance, if you put a 105W TDP SKU like the 3800X or 5800X on a motherboard with a VRM rated for less than 100 amps of output, the VRM is going to have a hard time and ECO mode could potentially give a better performance result as the CPU is forced to run at a lower power specification. 95W and 105W CPUs like the 3600X and 5800X are forced to run at a 65W TDP standard, while 65W CPUs like the 3600 and 3700X are forced to run at a 45W TDP standard. Lowering the power standards with ECO mode could, in theory, improve performance results if the throttling is electrical based and not thermal based, something that is entirely the fault of an inexperienced buyer.
In my testing with ECO mode on a 3900X, with a Deepcool Castle 360 V2, 6 SP120 case fans, on an X470 AORUS GAMING 7 (rated for 200 amps, more than enough), performance was worse across the board as I expected, because boosting is naturally going to be worse when you're not thermally or electrically being throttled at stock.
Temperatures barely improved over stock configuration either, laughably so, as it doesn't solve a core problem with Precision Boost; CPUs often use more voltage than they actually need.
My CCX overclock (CCX 0/1/2/3 = 4.3/4.3/4.1/4.2) yielded generally better results aside from single core performance scores by a rather significant margin compared to both stock and ECO mode configurations, while running at a core voltage of 1.256v, which is at least around 10 degrees cooler than stock configuration and almost twice that of what I saw with ECO mode since it's running a fixed and lower voltage. So as long as you do sufficient testing to make sure the desired voltage is safe even at 100% current loads (as high current is where high enough voltage does damage) and keep the voltage low, it's generally going to do you better in both performance and thermals than ECO mode because it's just a PBO preset, it doesn't stop voltages from being high which is the primary cause.
The true value of ECO mode is only going to be apparent if you're being throttled, or if you want to force your CPU to run at a lower power standard for environmental purposes while not losing out on performance completely by disabling boosting altogether, and if it's not throttling at stock, you WILL lose performance by enabling it.