引自http://www.anandtech.com/storage/sh...aspx?i=2480&p=3
As long as your power supply is still plugged in and turned on, regardless of whether or not your system is running, shut down or in standby mode, the i-RAM will still be powered by the 3.3V line feeding it from the PCI slot.

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PCI 2.2 走的是 3.3v, 而且"一般" ATX2.0 並沒有 5v standby 只有 3.3v standby
I-RAM 使用的是 PCI A14 腳的 3.3v 來供電與充電. 有問題歡迎指正.