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System Configuration
Our Asus R12A 1U server came with two X5570 CPUs, running at 2.93GHz with 8MB L3 cache and a 95W TDP. This particular model can increase frequency by three bins (400MHz) if only one or two cores are active, and two bins if three or more cores are active. So a CPU with four active cores could easily be operating at 3.2GHz – especially with aggressive cooling to lower junction temperatures and hence leakage. Our Harpertown server is the same one tested previously with two 3.0GHz E5472 CPUs with a 1.6GT/s bus and 80W TDP.The two servers were configured as indicated in the chart below. Note that the Supermicro is a 2U system that supports up to eight drives, while the Asus is a slender 1U with only four drives at most – so this will account for some of the differences in power. The FB-DIMMs are a pretty big contributor as well – 8 FBD will consume around 40W of extra power.
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