LIF is Mexican and ZIF is white
Cutec at http://cutec.wordpress.com/2008/08/14/acer-aspire-one-zg5-hands-on-experience/#comment-77 propose the following:
Difference between ZIF and LIF is in the design, ZIF is designed to be changed less than 5 times, LIF about 20 times before breakage is expected.
another great site: ziflif.info/ziflif/
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The letters L and Z. LIF is low insertion force while ZIF is zero insertion force. LIF is used to provide an "interference fit" between two components (a plug and a socket) such that a small amount of force is required to engage them and fully lock them into place. ZIF has no interference and thus requires some additional means of latching the connection so that the two components do not come apart. LIF is cheaper to produce as it requires fewer components, however the connection is only as good as the interference between the components. An example of a LIF is a USB plug and socket. An example of a ZIF is an RJ45 plug and socket (Ethernet connection), which has a spring-loaded plastic "tang" on the plug to lock the connection in the socket. SATA drive connections come in both LIF and ZIF forms.
Pin 1 on the CPU is aligned with Pin 1 on the ZIF socket.
Zero Insertion Force (a socket normally used with electronic chips so they dont have to be soldered - the heat can damage them)
A CPU socket is a mechanical connection. Its main function is to serve as a connection that holds the CPU and allows it to communicate with the motherboard.
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