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C6678 DDR3

C6678外挂4片DDR3,在1333M是有误码,将6678的PTV15管脚的45.3Ω电阻去掉就可以正常运行。数据手册推荐要焊电阻,麻烦问一下这个电阻的作用是啥,不焊与焊上有啥关系,谢谢!