Phenom vs Ryzen: Hexa-cores a decade apart (Part 8)

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 Thermals and Power

AMD delivered its most energy efficient architecture to date with Zen 3. Consider the fact that Ryzen 5 5600X delivers ~15% faster performance than Ryzen 5 3600X in general while delivering north of 20% faster performance in many gaming titles, all while sipping much less power with rated TDP of 65W vs 95W. 

Taking a look at the power consumption figures, we can easily see just how far AMD came in terms of power efficiency. Smaller node does allow for more densely packed transistors while also improving energy efficiency. Compared to the 45nm node for Phenom, the Ryzen 5000 series is on a significantly newer enhanced 7nm node with further improvements to the architecture to get a 24% generational improvement in energy efficiency.

For the following benchmarks, sensor data was collected as reported by readings from HWInfo. Software readings as such doesn't always portray the actual temperatures, specially on older processors such as Phenom. They are better shown by thermal imaging devices but since I don't own one, this will have to make do. Since these might be slightly less accurate representation of the figures, we will be taking a look at just 2 benchmarks to get an overall idea.

cpu_power

Power consumption figures as reported by HWInfo, for the 5600X was incredibly 99% lower than 1055T while running H.265 encode in Handbrake. Couple that with the fact that 5600X was 728% faster in the workload, the performance per watt is just insane!

cpu_temp

This is the first (and also only) graph we will see where the Phenom shines brighter. Now to be clear, we just saw the 5600X manhandle the 1055T by delivering 728% faster performance while consuming half the power! AMD says they are using up as much of the thermal headroom as they can; so better the cooler, faster will the chip run albeit a bit hotter. AMD's auto overclocking technology PBO, does just the same. Do note that the 5600X here is equipped with a stock cooler. For intensive workloads such as these, the stock cooler often falls short. As reviewed by multiple professional review websites, with a decent air cooler 5600X remains well within 65°C (references here and here).


Part 1: Introduction

Part 2: Gallery

Part 3: Test Setup and Methodology

Part 4: CPU Benchmarks

Part 5: Gaming Benchmarks

Part 6: Hexa-cores vs dual-core

Part 7: Platform Benchmarks

Part 8: Thermals and Power

Part 9: Conclusion

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