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Advanced Micro Devices, Inc. Message Board

  • dr_max_facts dr_max_facts Apr 25, 2013 9:30 AM Flag

    Dual GPU HD 7990 = Wattsucking, Runt Rendering, Stuttering POS!

    Dual GPU HD 7990 = Wattsucking, Runt Rendering, Stuttering POS! You're much better off investing in The Worlds Most Powerful GPU Titan!

    Hardocp, AMD HD 7990 CrossFire. It stuttered badly at very high settings and you knew, you could feel it that it wasn't playable as it negatively affected the overall gameplay and immersion. It takes higher framerates to get a smoother experience with CrossFire than with SLI.

    HotHardware noting that under load, its power consumption was over 100 watts higher than the GTX 690.

    Comparing the watt sucking HD 7990 against the GTX 690, Anandtech found that the 7990 is statistically tied with its rival.

    Tom's Hardware found that the 7990's power-related vibrations actually created more sound than the whirring fans themselves.

    In the end, most reviewers couldn't recommend the 7990 over the alternatives. It does come bundled with eight top-shelf gaming titles -- Crysis 3, Battlefield 3 and Bioshock Infinite to name a few -- which makes its hefty price tag easier to swallow, but that wasn't enough to sway the crowd. Tom's Hardware noted that while it's certainly better than its predecessor, it comes up shy of its competition: "The GTX 690 is shorter, set up to exhaust at least some of its waste heat out of your chassis, and significantly more power-friendly... NVIDIA simply sells a better-built dual-GPU graphics card."

    Bit-tech similarly concluded that you would be better off either getting two 7970 GPUs running Crossfire if you want better performance, or the GTX 690 if you're short on space. For Anandtech, the GTX Titan remains the one to get despite its lower frame rate because of the consistency and simplicity of strong single-GPU cards over their multi-GPU compadres. Tech Spot agreed with the choice, claiming that the Titan offered better overall frame time performance than the 7990. Seeing as both the GTX 690 and GTX Titan are priced similarly at $1,000, it's ultimately your call on where you want to spend that precious grand.

    Sentiment: Strong Sell

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    • What was used for the trailer for bf4 Titan or amd hd7990?

    • I don't buy it. This looks to me like AMD has been caught with their pants down and are desperately trying to downplay this serious problem as a damage limitation exercise. So, if microstuttering and runt frames are so "insignificant", then why have AMD previously acknowledged this problem, saying that a driver fix will be eventually released in a couple of months that fixes it?
      -
      I knew this review was going to turn out like this after publishing our faux-HD 7990 performance results last month. With its performance completely dependent on CrossFire technology, the HD 7990 as a $1000 graphics card has a very hard time justifying its price. With our early testing of the Catalyst prototype driver showing positive results though, there is yet hope for CrossFire to be fixed in this generation, at least for single monitor users! But until that driver is perfected, is bug free and is presented to buyers as a made-for-primetime solution, I just cannot recommend an investment this large on the Radeon HD 7990.

      Sentiment: Strong Sell

      • 3 Replies to dr_max_facts
      • The HD 7900 series cards have now been out for about a year and a half and are heading for replacement by the 8000 series cards later this year, so it beggars belief that AMD are only now getting to grips with this problem, now that the merde has truly hit the fan. This does not give one confidence in the company to deliver a decent graphics solution and is reminiscent of their significant performance lag behind Intel in the CPU market. They certainly shouldn't be charging top dollar for products with such serious flaws. This also extends to single card configurations too, since the new $1000 HD 7990 rather incredibly exhibits severe and very annoying coil whine when in 3D mode!

        Would you spend $1000 on a card with such massive flaws? Tell us in the forum.

        Sentiment: Strong Sell

      • So, AMD are improving the situation by using frame pacing, similar to what NVIDIA has been doing for a long time now? Better late than never, I guess.

        All in all, it looks like Nalasco was spinning PR speak in a bid to downplay the seriousness of this problem as a damage limitation exercise, rather than honestly face up to it. The interview covers other aspects of multi GPU rendering such as Alternate Frame Rendering (AFR) and is well worth reading.

        Sentiment: Strong Sell

      • So did u buy the Titan?

    • AMD has had their share of problems with this issue. For the Radeon HD 7990, they once again said they were working on a solution to the problem. AMD would not reveal any details however, so we hoped to gain some knowledge through our measurements.

      We chose two testing scenarios that play into the hands of micro stuttering. 30 frames per second are one of those worst-case scenarios, during which we recorded the frametimes.

      Frame times jump between approx. 10 and 50 ms in Battlefield 3 when horizontal movements are displayed. The player will noticeably be bothered by this, killing any fun when playing.

      In Far Cry 3, we see a similar picture as in Battlefield 3, though to a less extreme extent. Nonetheless, we measured unstable frame times, with abrupt changes between 22 and 47 ms.

      In essence, the only sensible solution for multi-GPU systems based on AMD GPUs remains the old one: a frame limiter. It limits the FPS to a fixed value, which ideally the system should always be able to achieve. At an average of 60 FPS, however, it should not be set as a limit, since - depending on the scene in the game - the FPS could also fall under it, again causing micro stuttering.

      The full load Radeon HD 7990 uses around 615 watts and at idle it runs close to 150 watts, compared to 415 watts of the GeForce GTX 690, are not justified by a corresponding performance boost. If you place special value on a good performamce/watt ratio, you won't be pleased with the Radeon HD 7990.

      Sentiment: Strong Sell

    • Conclusion
      I Repeat, Dual GPU HD 7990 = Wattsucking, Runt Rendering, Stuttering POS!
      -
      Awarding a performance score is difficult given the fickle nature of the card in single screen gaming. Unlike when we first tested the GTX 690 4GB, which offered solid multi-GPU scaling at any resoltuion, the HD 7990 6GB's and its CrossFire driver are clearly more optimised for three screen gaming, where the card consistently enjoys scaling that exceeds 80 per cent. However, it's certainly arguable that if you're dropping £700 on a GPU, it'll be due to your use of Multi-screen resolutions, lessening this blow.

      We can't deny the HD 7990 6GB offers respectable value over a GTX 690 4GB for Battlefield 3, as it tops its performance whilst costing £70 less. However, elsewhere the GTX 690 4GB offers much more consistent and improved performance across a range of resolutions, and with much lower power consumption too. The HD 7990 6GB is also disadvantaged by the profligacy of cheap HD 7970 3GBs now on the market, frequently available for just over £300.

      It's strange to see a manufacturer producing such a high-end GPU so late in a GPU's life cycle. The HD 7970 3GB first arrived just shy of 12 months ago, yet its taken until now for AMD, or at least, its partners, to produce a dual-GPU version of the card. With its monster power consumption and erratic, driver-dependant performance, it's not a card we'd recommend then, serving instead as an impressive engineering exercise rather than a genuine high-end option.

      Sentiment: Strong Sell

    • Dual GPU HD 7990 = Wattsucking, Runt Rendering, Stuttering POS! LOL, its all over the net AMD crossfire is FUBAR, SLI is far better for your eyes. Its a well know fact that AMD needs a whole hell of lot more FPS to try to look as smooth as SLI, I'll take SLI at 60FPS rather than crossfire at 100.

      Sentiment: Strong Sell

 
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