Intel Core i5-10400F has a version with the IHS soldered and one without soldering - HardwarEsfera
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Intel Core i5-10400F Review - Six Cores with HT for Under $200 - A Closer Look | TechPowerUp
Intel Core i5-10400F Review - Six Cores with HT for Under $200 - Architecture | TechPowerUp
Amazon.com: Intel Core i5-10400F Desktop Processor 6 Cores up to 4.3 GHz Without Processor Graphics LGA1200 (Intel 400 Series chipset) 65W, Model Number: BX8070110400F : Electronics
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Intel Core i9-10900K vs Intel Core i5-10400F vs Intel Core i5-10600K