Following up on this weekend's statement from AMD about a potential power issue with the reference Radeon RX 480, AMD has just sent over their previously promised update on their progress dealing with the issue.

In short, they are nearly finished preparing their updated driver, 16.7.1, which will be posted "within the next 48 hours" (which at this point is late Thursday). The new driver will offer two solutions to the power problem.

The default solution: shift some of the power load off of the PCIe Graphics (PEG) slot connector, presumably in order to bring power consumption within PCIe spec. Note that AMD doesn't say anything about reducing the total power consumption, and given option #2, it's reasonable to assume that this involves holding the power requirements as-is and shifting the load to the external 6-pin power connector. Based on earlier data this would potentially put the 6-in connector further over spec, but the vast majority of PSUs are very tolerant of this going out of spec.

The optional solution: a toggle that reduces the total power consumption of the card, presumably ensuring both the PEG slot and 6-pin power connector stay below their respective limits. Since the RX 480 is already throttling at times due to power limits, this would further hurt performance, but it's also the most standards-compliant solution (and aptly named "compatibility" mode). AMD notes that this option will have "minimal performance impact", and while we'll have to see the results in the benchmarks, it's worth noting that power consumption is cubic - that is, roughly to the 3rd power of frequency - so a small reduction in frequency can significantly reduce power consumption, as we've seen in the case of the Radeon R9 Nano.

Along with this, AMD is also touting some slight performance optimizations in this driver that they hope will offset any performance loss (though I'd note that these optimizations would have come anyhow). We'll have more on this when AMD ships their driver.

In the meantime AMD's full statement is as follows:

We promised an update today (July 5, 2016) following concerns around the Radeon™ RX 480 drawing excess current from the PCIe bus. Although we are confident that the levels of reported power draws by the Radeon RX 480 do not pose a risk of damage to motherboards or other PC components based on expected usage, we are serious about addressing this topic and allaying outstanding concerns. Towards that end, we assembled a worldwide team this past weekend to investigate and develop a driver update to improve the power draw. We’re pleased to report that this driver—Radeon Software 16.7.1—is now undergoing final testing and will be released to the public in the next 48 hours.

In this driver we’ve implemented a change to address power distribution on the Radeon RX 480 – this change will lower current drawn from the PCIe bus.

Separately, we’ve also included an option to reduce total power with minimal performance impact. Users will find this as the “compatibility” UI toggle in the Global Settings menu of Radeon Settings. This toggle is “off” by default.

Finally, we’ve implemented a collection of performance improvements for the Polaris architecture that yield performance uplifts in popular game titles of up to 3%1. These optimizations are designed to improve the performance of the Radeon RX 480, and should substantially offset the performance impact for users who choose to activate the “compatibility” toggle.

AMD is committed to delivering high quality and high performance products, and we’ll continue to provide users with more control over their product’s performance and efficiency. We appreciate all the feedback so far, and we’ll continue to bring further performance and performance/W optimizations to the Radeon RX 480.

1: Based on data running ’Total War: Warhammer’, ultra settings, 1080p resolution. Radeon Software 16.6.2 74.2FPS vs Radeon Software 16.7.1 78.3FPS; Metro Last Light, very high settings, 1080p resolution, 80.9FPS vs 82.7 FPS. Witcher 3, Ultra settings, 1440p, 31.5FPS vs 32.5, Far Cry 4, ultra settings, 1440p, 54.65FPS vs 56.38FPS, 3DMark11 Extreme, 22.8 vs 23.7  System config: Core i7-5960X, 16GB DDR4-2666MHz, Gigabyte X99-UD4, Windows 10 64-bit. Performance figures are not average, may vary from run-to-run.

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  • KateH - Wednesday, July 6, 2016 - link

    Generally, yeah. The official limitation is largely due to maintaining a margin of safety taking into account wire gauge and connector quality; keeping power under 75W (6.25A@12v) means that using a cheap PSU with 22AWG leads on the PCIe power lines, or an older supply with a Molex/SATA-to-PCIe adapter won't intrinsically create an unsafe situation.

    Assuming good connectors, common PSUs with 20 or 18AWG 12v supply leads ought to be able to safely push north of 100W thru the 6-pin, and high-quality PSUs with 16AWG leads could safely do a full 150W *PROVIDED* the connectors on both the GPU and supply line are of good quality and are making good contact. This is the rub, and the thing that can burn up ppl's GPUs.
  • hedon - Wednesday, July 6, 2016 - link

    When there's no rival over NVidia or Intel, we're gonna be near to death.
  • vladx - Wednesday, July 6, 2016 - link

    Bullshit even with AMD gone, they would still need to improve to sell new products over their old ones. Not that I want AMD gone, like I said elsewhere someone like Apple buying AMD would be great. Apple+AMD is the perfect match.
  • Gich - Wednesday, July 6, 2016 - link

    Sure they have to improve, but they can give out just the bare minumum... look at how much Intel has improved since Bulldozer!
  • Scali - Wednesday, July 6, 2016 - link

    You mean stuff like this?
    Yea, pretty impressive indeed!
  • atlantico - Wednesday, July 6, 2016 - link

  • Scali - Thursday, July 7, 2016 - link

    Price is just an arbitrary number. Innovation is about developing new technology. This CPU is proof that Intel continues to develop and improve their technology.
    Someone asked "look at how much Intel has improved since Bulldozer", well, there you have it.
  • barleyguy - Wednesday, July 6, 2016 - link

    As another data point, the original Pentium came out at $1200 (a lot more if you add inflation), for a chip that at first had very little performance advantage over the top 486s and also had a major bug. That's where we will be back to if Intel doesn't have any competition. The NVidia situation would be similar.

    (I build at least one AMD based computer a year either for myself or a friend, and am also an AMD stockholder. I do both of these things partially to support competition.)
  • Scali - Thursday, July 7, 2016 - link

    The Pentium was a technological quantum leap over the 486, offering a fully superscalar integer pipeline, and a pipelined FPU to boot. Well-optimized integer code can be almost twice as fast on a Pentium as a 486 at the same clockspeed. FPU code can be 3-4 times as fast.
    Not to mention the fact that Pentiums also clocked much higher than 486es because of the deeper pipeline design.
  • bill4 - Wednesday, July 6, 2016 - link

    samsung was looking at buying amd...i think that'd be better. Apple would have no use for AMD outside of being a person supplier. All AMD's business is nothing to AMD.

    BTW Nvidia is already gouging people, look at the "Founders Edition" crap. And the fact they charge $50-100 more than AMD for the same performance in most cases ALREADY, because AMD has such small share Nvidia can already act like a monopoly to some extent. It will only get much worse if AMD goes out of business. Luckily AMD stock is up 300% this year.

    Anyways it's what Nvidia fanboys wanted. So, they will enjoy paying more to make Nvidia richer.

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