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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  • duploxxx - Wednesday, July 06, 2016 - link

    hahah nice, joke. so all those nvidia cards where there is no 4GB but only 3.5 can do the same ???? Reply
  • Scali - Wednesday, July 06, 2016 - link

    Which nVidia cards would that be?
    Not the GTX970 at least, because if you remove the cooler, you can easily see that there is 4 GB of memory physically present.
    And if you run some DirectX diagnostics tools, you can easily see it report two segments of memory, one 3.5 GB and one 0.5 GB, totaling 4 GB.
    Reply
  • Drumsticks - Wednesday, July 06, 2016 - link

    Wouldn't they have been breaking specs by not allowing full high bandwidth access to all 4GB of that memory at once...? Reply
  • vanilla_gorilla - Wednesday, July 06, 2016 - link

    What "spec" would that be? Reply
  • Drumsticks - Wednesday, July 06, 2016 - link

    The ones their own technical marketing team provided everybody in September 2014? They advertised 64 ROPs, and 2MB of L2 cache, along with that 4GB of memory. A full 1/8th of the ROPs and L2 weren't actually there, despite marketing it as such, to everybody. On top of that, in practice it's difficult (and generally not done due to this) to access both segments of memory at once, meaning they really mainly use 3.5GB of memory.

    http://www.anandtech.com/show/8935/geforce-gtx-970...

    It's possible to like a company and still hold them accountable for their screwups. That's what drives them to make a better product, after all.
    Reply
  • Geranium - Wednesday, July 06, 2016 - link

    Its not a problem, its a feature. Reply
  • Scali - Thursday, July 07, 2016 - link

    No. In practice you can rarely reach the full theoretical bandwidth for a sustained period of time anyway. So nobody would expect that. That's what we have benchmarks for. Reply
  • D. Lister - Wednesday, July 06, 2016 - link

    "...RX480 users are entirely justified to demand a refund..."

    "...so all those nvidia cards where there is no 4GB but only 3.5 can do the same ?"

    Apparently some people did get a refund for their 970s. Although, and this may be of some passing significance, the memory issue couldn't really cause any hardware damage.

    I find it intriguing how in the past when AMD messed up, we would be reminded of how they came up with the 64-bit CPUs, and how they put the memory controller on the CPU, etc., etc. Nowadays? Instead of talking about the great innovations AMD has come up with, people go straight for pointing out the flaws of the competition. I have a feeling that here is something interesting to be learned from this subtle change in attitudes.
    Reply
  • tamalero - Wednesday, July 06, 2016 - link

    I think the most related issue would be those drivers by Nvidia (3 in a row?) that burned cards.
    All because they botched the fan vs temps dynamics.
    Reply
  • Peter2k - Wednesday, July 06, 2016 - link

    There's still a lawsuit about that going on in think
    And some got refunds of belive
    Reply

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