I always stick to Silver based for hotside and ceramique for cold side... just seemed logical choice when u look at arcticsilver.com and each TIM's operating temps...
Ceramique::> Peak: –150°C to >180°C Long-Term: –150°C to 125°C
Silver5::> Peak: –50°C to >180°C Long-Term: –50°C to 130°C
Used to seem MORE logical back in days of AS3 tho, as think it's lowest was -10 iirc... Only real reason I started using Ceramique was when I regassed the prommi to run at -70. Noticed silver based compounds stopped doin' the job... since then always stuck Ceramique on TEC Coldside and on PhaseChange.
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