回复:手提电脑内存2G升4G后总死机,什么原因?

Try memtest86/freeware, it will tell if you have a lemon. 

I had the same problem with my MacMini,  it can pass OSX RAM test, but memtest86 caught the problem,  I then got a free replacement,   please note that almost all RAM come with life time warranty. 

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