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AMD Boosts About RDNA 3 Efficiency as RTX 40-Series Looms

AMD’s latest blog discusses the performance per watt gains (opens in new tab) across the past several Radeon GPU generations. AMD’s Sam Naffziger, who spoke with us about RDNA 3’s chiplet design and efficiency gains in June, says AMD made some ‘big bets’ on GPU design and efficiency, and they are now paying off in very meaningful ways. He asserts that current and future AMD GPUs are meeting the needs of demanding games but doing so without sky-high power budgets. This is a timely reminder, if you need it, that energy prices are rocketing and Nvidia is expected to launch some very hefty graphics cards tomorrow at its GeForce Beyond event.

With PC gamers demanding better, faster visuals at ever higher resolutions, it’s no surprise that GPUs have started to push up and beyond 400W, writes Sam Naffzinger, an SVP, Corporate Fellow, and Product Technology Architect at AMD. Naffzinger says AMD has tuned its new RDNA architectures to break away from the ever increasing power consumption cycle using “thoughtful and innovative engineering and refinement.” Increased energy efficiency means lower-power graphics cards should run cooler, quieter, and be more readily available in smaller or mobile form factors.

AMD provided some evidence of its RDNA GPU architecture progress, a series which will begin its third generation later this year. For example, the transition from GCN to RDNA “delivered an average 50 percent performance-per-watt improvement,” according to Naffzinger’s stats. Moving from the Radeon RX 5000 (RDNA) to Radeon RX 6000 (RDNA 2) generation, AMD claims that it provided “a whopping 65 percent better performance per watt.”

To spice up the comparisons, AMD provided an interesting chart illustrating its RDNA 2 vs. Ampere “competitive advantage.” Obviously, these figures are cherry picked to make AMD look good, and note the “up to” language. Check our GPU benchmarks hierarchy and our list of the best graphics cards for an independent look at how things stack up..

(Image credit: AMD)

This slide is arguably misleading at best. If you ignore the table and just look at the headline, it sounds like AMD delivers a massive increase in value — up to 90% more FPS per dollar! Except, that comparison uses the recent Radeon RX 6400 and pits it against the six-years-old GTX 1050 Ti, which also happens to cost more than the newer GTX 1650. Hmmm. At least the GPU prices AMD lists look reasonably accurate (other than the inclusion of the GTX 1050 Ti), and if you omit ray tracing games the performance isn’t too far off our own results either.

For example, the RX 6950 XT averaged 115.4 fps at 1440p ultra in our tests, while the RTX 3090 averaged 106.5 fps. That matches the 8% performance difference AMD shows in the slide — though we tested a reference RTX 3090 Founders Edition against an overclocked Sapphire RX 6950 XT Nitro+ Pure. Another point of contention would be showing RX 6600 versus RTX 3050, even though as we pointed out recently the RTX 2060 is Nvidia’s best value option — it’s faster and cheaper than the RTX 3050. But let’s move on.

AMD’s blog explains that RDNA 2’s progress over RDNA was largely due to optimized switching, a high-frequency design, and smarter power management. Then it talks about how it will continue to push forward with RDNA 3. Key technology refinements and introductions in RDNA 3 include the 5nm process, chiplet packaging tech, adaptive power management, and a next generation Infinity Cache.

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