I have read AMD's own .pdf for thermal interface materials and thermal paste. AMD does have a document explaining TIM installation.
I have my own idea that how to put thermal paste on will vary with the 'spreadability' of the compound, design of metal of cooler that contacts the cpu lid (exposed heatpipes or not) and is the heatsink capable of very good to extreme clamping force.
You have a Noctua heatsink and if I remember correctly, they do in fact have a kit that is for 'extreme clamping force use'.
Grain of rice size dollop of paste in the center of the cpu lid. Pea sized (Lentil) dollop of paste in the center of the cpu lid. Spread the compound thinly but evenly across the cpu lid. And on and on for amounts of paste and how to apply it.
I have tried about every method I have ever seen written about at a time when I assembled and disassembled rigs up to 10 times a week, while working for a mobo manufacturer. Because some rigs would not stay together long, I normally stayed away from AS5 due to it having a long 'burn-in' time. I used other heat sink pastes that suggested no 'burn-in' time period and were not electrically nor capacitively active. ANY of the compounds worked IF the heatsink was capable of very good 'clamping-force' to the top of the processor. See the link below for some ideas. NOTE: your cooler base does not have exposed heat-pipes so the job is easier and less complicated.
What is the Best Way to Apply Thermal Grease? - Part 1
Three ways with pictures including the result pictures.[/QUOTE
The first time I did try and spread it with a gift card, but failed horribly so I just cleaned reapplied with a pea size or grain of rice and plopped the cooler on there, I can't seem to be able to spread it with a gift card uhhh