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9-Way Linux Laptop Performance Comparison From Intel Nehalem To Broadwell
The OpenSSL test also had the best power efficiency when it came to this CPU benchmark. The UX301LAA Haswell Core i7 ultrabook ran slightly faster in raw performance, but with noticeably higher power drain compared to the new Broadwell ultrabook.
Overall, the ThinkPad X1 Carbon had an average power consumption of 16.2 Watts when running these CPU and GPU benchmarks with a peak of 20.9 Watts. You can find more of this battery power test data from this OpenBenchmarking.org result file.