TYAN TRINITY I845DDR Manual page 14

The following diagram will illustrate how to install the most common heatsinks:
Install the mounting bracket onto the motherboard by
aligning the bracket with the four holes around the
processor socket. Once the bracket is aligned, press
down on the four white pegs on the bracket until they
insert securely, locking
motherboard. Then proceed to installing the heatsink.
Instructions on how to install heatsinks should be
provided with the heatsink itself.
the bracket onto
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First, use thermal compound (also
called heatsink compound or thermal
grease) and apply a small amount on
to the processor's core – the small
shiny square in the center of the
processor.
You may then use a small soft plastic
tool, like a credit card to gently smear
a thin layer of heatsink compound as
evenly as you can across the core. In
most cases, you don't need to do this
but it may help.
Then, at an angle, clip one side of the
heatsink onto the socket and then lay
the heatsink flat onto the processor.
Then clip the other end of the heatsink
down either with your finger or by
using a flathead screw driver.
Some heatsinks have a small clip on
the inside of one of the clips which you
can insert a small flathead screw
driver into to secure the heatsink.
In most cases, either side of the
heatsink can be clipped down last, but
usually, the side of the socket where it
is raised, secures last.
Because one side of the socket is
raised (and usually has "SOCKET"
imprinted into it) heatsinks have an
indent on one side to secure flush with
the raised side
Be sure to carefully observe which
side your heatsink is seated before
securing it down to avoid damaging
the processor, the heatsink or both.
the
of the socket.