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Hi everyone I'm just wondring if someone can explain to me a little bit about the FPU test in AIDA64. Until now I've been running stress tests with CPU, FPU, and cache being tortured. As I understand it this is fine, but running an FPU only SST will applying the peak temperature to a CPU in order to show that it's capable of running under such circumstances without throttling back. I've so far got a stable 4.2Ghz clock out of my 4770K and I'm going to move on (with a target of 4.4GhZ or 4.3Ghz). At my 4.2Ghz clock the machine was stable for over 14 hours under AIDA64's CPU/FPU/Cache test and hit a peak temp of 75°c (on air). It generally floated around 65°c-70° on all cores. Following this I've just carried out an FPU only test under the same spec. It peaked at 90°c on core 3, with the lowest peak on any other core being 81°c. It didn't throttle (I believe the Haswell chips do this at about 95°c, TJMax is 100°c), but I stopped it after 15 minutes. Now obviously the intention of a stress test is to put the machine under more or at least as much continuous pressure as real world use would. Although my CPU didn't throttle, those FPU test temps are a bit higher than I'm really comfortable with. I think I read somewhere that the FPU test uses AVX instructions, but I'm not sure if that's correct - truth is I don't know how it works to reach it's temperatures. But what I really want to know is how representative of real-world use is it? What sort of applications might push the CPU in the same way? Many? A certain set or applications in a particular professional field? Are the results of this test alone something I should concern myself with if I've so far considered the same clock to be stable and safe under the full SST for over 14 hours? If it helps, I'm running Windows 7 x64 and will be using the PC for music production, meaning it's heaviest load in real-world use will likely be Ableton Live plus a good handful of VST instruments and effects (creating and processing sound in real time). Native Instruments VSTs will feature fairly heavily. Cheers Mike