No real world app or game does that for an extended period of time. It is certainly not elective in how it utilizes the GPU, as the application basically lights up the entire card to create or emulate maximum power draws and scenarios. Now, I would also like to note that this particular benchmark (FurMark) was coded primarily as a stress test. There are protection measures in place that kick in when thermal or power levels exceed maximum permitted levels, so the card was taking the correct actions to protect both itself and the motherboard. The Legion FurMark results tell me that the 5970 is doing exactly what it was designed to do. TG Daily has interviewed AMD’s Dave Baumann about this situation: However rather than throttle the cores down just a little, or even to the default operating specification, it drops the frequency to just 550MHz, that’s a 24% under clock on each core. In order to avoid cooking itself, the Radeon HD 5970 throttles both cores down, negating any positive performance impact the overclock is going to have. With an overclocked core clock of 875MHz, the temperatures exceeded 100 degrees causing the throttling of both GPUs to 550MHz. This is exactly what happened with the HD 5970 tortured by FurMark. New Radeon HD 5000 series have a hardware protection against overheat (see this post): if the hardware detects a dangerous situation (overload) for the GPU or the VRM, the hardware will immediately throttle back the card by one PowerPlay level. Few times ago, AMD has published some slides about the massive overcloking headroom of the Radeon HD 5970. The guys at Legion Hardware have encoutered some overcloking issues with AMD’s Radeon HD 5970 during FurMark stress test.
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