first of all,does ur laptop support 800mhz ram?
if ur laptop doesn't,,then u cant install 800mhz ram.
stick to 667mhz lor..

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Added on December 15, 2009, 11:01 pmsecond,if ur laptop support 800mhz ram and u have a 667mhz ram in one of the slot.
if u install 800mhz ram,,it'll only run in 667mhz because the speed is automatically changed due to the another 667mhz ram installed.
which means,,the speed will be 667mhz only.

This post has been edited by UnknownH: Dec 15 2009, 11:01 PM