For processor cooling do not use this tape. For LGA1156 use hi-performance thermal grease. 
Nic,

According to this picture, I want to buy the 3M™ THERMAL CONDUCTIVE ADHESIVE TRANSFER TAPE 9885 as spare if I gotta remove the vga cooler heatsinks and use on other graphic card.



* how i calculate:
A = 5 x 0.5 length chips = 2.5
B = 19 x full length chips = 19

A + B = 21.5 = 22 chips

So,

If I use the 4 x 13mm x 13 mm packs (RM5), i think I gonna need up to 5 packs.

Based on the photo, there are roughly (22* chips x13)mm = 286mm = 30 cm.

How much for 30 cm x 13 mm?