Given the high volume of processors we manage, we don't fully clean off the thermal paste. Please be aware that your processor may have some thermal paste on it. A simple Q-tip and rubbing alcohol can help you clean it off. Exact serial #s will be shipped out.The Intel Core i7-3820 3.6GHz 4-Core CPU Processor is a high-performance processor designed for gaming and demanding tasks. With a clock speed of 3.60 GHz and 4 cores, the processor delivers fast and efficient processing power. It features a large cache size of 10 MB Intel Smart Cache and a bus speed of 5 GT/s, ensuring smooth and seamless performance. The processor is compatible with the FCLGA2011 socket type, making it suitable for a wide range of motherboards. Whether you are a gamer or a heavy user, this CPU is a reliable and powerful choice for your computer setup.