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The Intel Pentium 4 521 is a single-core desktop processor released in 2004. It operates at a clock speed of 2.80 GHz with a 1 MB L2 cache and an 800 MHz front-side bus (FSB). Built on the Prescott core architecture and using the Socket LGA 775 interface, it supports Hyper-Threading Technology, allowing improved multitasking performance for its time. Fabricated on a 90 nm process, it was primarily used in early 2000s desktop PCs for general computing and office applications.
 
C5F4 Non Data Device