Caseking is basically testing batches of i7 8700K processors, delidding them, and then applying Thermal Grizzly's Conductonaut liquid metal thermal grease and the aforementioned silver heatspreader to improve operating temperatures as much as they can be. The company is doing this in partnership with overclocking poster child der8auer, and brands the silver IHS with both Caseking's and Der8auer's logo. The silver heatspreader versions of the Core i7 8700K are being sold as the Ultra Edition, and Caseking are asking a hefty premium for their binned CPUs: ?690 will get you an 8700K that is guaranteed to clock up to 5.0 GHz, ?750 will guarantee 5.1 GHz, and the premium of premiums (for now, we'd imagine) 5.2 GHz overclockable processor will cost ?870.
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