Alienware MJ-12 X2, Руководство пользователя

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FSB jumper [JP3, JP3A]
These jumpers define the type of memory that the system will be using. In order to
support 800MHz DDR2, the jumpers JP3 and JP3A (shown on the image below) need to
be covering pins 2 and 3.
Case open pin header [J42]
This jumper when enabled will detect when the system’s case (chassis) has been
opened. A message will show up on the screen after the intrusion until the message is
deleted. This feature is available only when using a chassis that supports intrusion
detection. The sensor cable from the case needs to be plugged into this header. If there
is no cable plugged into the case open pin header, the feature is disabled (see image
below).
Front audio jumper [J57B]
This jumper allows the usage of front panel audio connectors. If the jumpers are located
covering pins 5 and 6, and 9 and 10, the front audio feature is completely disabled (see
image below).
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