We've had a review setup here in Damage Labs for quite a while now, but my penchant for last-minute testing efforts combined with some technical problems have delayed our review. The technical problems have to do with thermal throttling, as you can see illustrated in the screenshot below taken from the review system:This setup gets too hot under load on our open test benchwith CPU temps up to 90 degrees Celsiuscausing the CPU to resort to thermal throttling in order to cool itself. Of course, once we found this problem, we had to throw out all of our benchmark results, because they would be invalidated by the presence of TM1 throttling, which can really hamper CPU performance.
Having spent a number of hours troubleshooting this issue, I don't think it's straightforwardly caused by a CPU that runs too hot. In fact, we found the problem to be worse on the same Intel 975X-based motherboard with an older Extreme Edition 840 processor that we know to be sufficiently cooled on a different motherboard using the exact same cooler. The problem appears to be caused by the way the Intel 975X mobo is reading and reacting to thermal data from the CPU and thus controlling the fan speed of the stock Intel CPU cooler, although these things get complex enough that I hesitate to pinpoint an exact cause. We are on our second CPU/mobo/cooler combination without a resolution. Intel says it is still working on a fix, and all I know is that this issue doesn’t look to be something that can be resolved by a simple BIOS update.
What I can tell you is that the throttling problems were easily resolved once I purchased one of these babies, a Zalman CNPS9500 LED cooler, and installed it on the system. With the thermal problems out of the way, I can proceed with CPU testing, so we should have a review for you later in the week or early next week. In the meantime, you may want to watch the reviews elsewhere on the web today carefully to see that they address any possible thermal problems and thus have been sure to produce valid benchmark results.
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