Shin-Etsu MicroSi Thermal Interface Material X-23-7921-5 W/m.K > 6.0 (3g)
Shin-Etsu Silicone Thermal Grease: This silicone fluid compound contains thermally-conductive fillers. With a high thermal conductivity value, this product emphasizes high bulk thermal conductivity values and ease of workability. The smaller diameter filler allows the material to achieve thinner bondlines. Ideally suited for CPU's and applications where mating surfaces have minimally uneven surfaces.
Syringe application: Shin-Etsu MicroSi's syringes are ideal for manual applications assuring that a consistent shot weight is applied to the intended surface. Shin-Etsu MicroSi's SQC processes provide a consistent dispense weight with each syringe.
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Source: https://www.amd.com/en/support/kb/faq/cpu-0001