You don't need to remove your motherboard to apply paste. This board was removed for demonstration purposes. You will only need to remove the CPU cooler to gain access to the top of the CPU.
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Watch video How to apply thermal paste on CPU-EASY with links in the description online without registration, duration hours minute second in high quality. This video was added by user Silicon Direct 31 December 2014, don't forget to share it with your friends and acquaintances, it has been viewed on our site 1,462 once and liked it 20 people.