Overclocking -
It seems that each new generation of Intel CPUs brings new overclocking challenges and Haswell is no different. As with Ivy Bridge there are temperature issues to consider when overclocking and now you also have to deal with voltages to the CPU cache. This makes getting a high clock speed tricky, but not impossible. We were able to hit 5GHz very easily, but it was nowhere near stable. We ended up having to back things off to get a bench stable overclock of 4.8GHz. This is not yet a 24/7 clock as we have not put it under the stress of prime or another intensive application, but it does meet the requirement of running all of our internal benched back-to-back without any errors.
The temperatures that we saw were not bad although, to be honest, we expected better as Haswell is a more mature 22nm CPU. Idle temps were taken after 30 minutes of operationn with no applicatons running other than background proesses. We used CoreTemp and Asus AISuite III to mesure them. Load temperatures were taken at loop 23 of a 32M HyperPi run (100% CPU on all cores for around 10 Minutes).
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