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The recent technology faces the challenges to reduce energy consumption of DRAM, which consumes about 30% of total energy in data centers. Phase change RAM (PRAM), not requiring the charge current because of its non-volatility, has appeared for replacing DRAM. However, it has some disadvantages which are its low performance, high write power, and write endurance limitation compared to DRAM. To overcome these weak points of PRAM, the research related to the hybrid model combining PRAM with DRAM has been progressed. Unfortunately, previous works on hybrid memory is hard to be applied to the market because established hardware needs to be changed.
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