Quad-core processors fit into specific motherboard slots.
Quad-core processors have four separate cores of the processor working on different tasks to enable computers to multitask more efficiently. Different brands and models of processors fit into specific motherboard slots. Compatibility is important when building a computer; you must ensure your motherboard has a slot that will fit the processor you want to install.
AMD Phenom
AMD is one of the two main manufacturers of quad-core processors. The AMD Phenom and the AMD Phenom II were available as of January of 2011. The Phenom uses an AM2+ motherboard slot. The Phenom II can also use the AM2+ slot, but works best in an AM3 slot.
Intel Core 2 Quad
The Intel Core 2 Quad processor is the older of Intel's quad core offerings. It has been available since the first part of 2007. The Core 2 Quad processor uses the LGA775 motherboard slot.
Intel i7 Series
The Intel i7 series is Intel's flagship line of quad core processors. The 800 series is a bit older and uses motherboard socket LGA1156. The 900 series has higher speeds and uses an LGA 1366 motherboard slot.
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