I want to add 2 more sticks and radiator version woth it?

ProzacR

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Jan 28, 2014
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I have ASUS P5QL/EPU motherboard and Patriot 2x 2GB PC2 - 6400 800Mhz CL6.
Buying 8 Gb kit would be quite above budget for me, so I just plan 2 more sticks:
DDR2 Patriot 2GB 800MHz CL6
or:
DDR2 Patriot 2GB 800MHz CL6 with radiator.

Will they both work for me together with old ones? And should I buy version with radiator?

p.s. Sorry if this question is asked quite few times here, but I want to be sure. Some net pages say "buy kit" and local shop assistant tried to sell me left over 667 Mhz and other company sticks as upgrade so I am very confused now.