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Socket 775

Socket LGA775 is the socket type currently used by Intel CPUs. If you have a socket LGA775 motherboard this means you have a Socket LGA775 Celeron D, a Socket LGA775 Pentium 4, a Socket LGA775 Pentium 4 Extreme Edition, a Pentium D, a Pentium Extreme Edition, a Core 2 Duo, a Core 2 Extreme or a Core 2 Quad. Keep in mind that some of these CPUs are available for other sockets as well, so we are talking specifically about socket LGA775 models here. In order to know what is the fastest CPU you can install on your motherboard, you will need to know what is the maximum FSB clock rate your motherboard supports. Typical values are 533 MHz, 800 MHz and 1,066 MHz.

To make things simpler, we compiled two tables, shown below. At one side you have your motherboard FSB and on the other which CPUs are supported.

FSB Celeron D Pentium 4 Pentium 4 Extreme Edition Pentium D Pentium Extreme Edition
533 MHz All socket LGA775 models, available up to 3.2 GHz (“351” model). All socket LGA775 models up to 2.66 GHz, and 2.80 GHz, 2.93 GHz and 3.06 GHz models. Be careful, as there is a 2.80 GHz version also available with an 800 MHz FSB. Not supported. So far only 2.66 GHz model (“805” model). * Not supported.
800 MHz All socket LGA775 models, available up to 3.2 GHz (“351” model). All socket LGA775 models up to 2.80 GHz, except the 3.73 GHz model. All socket LGA775 models up to 3.40 GHz. All models, available up to 3.60 GHz (“960” model). * So far only 3.20 GHz model (“840” model). *
1,066 MHz All socket LGA775 models, available up to 3.2 GHz (“351” model). All socket LGA775 models, available up to 2.80 GHz. All socket LGA775 models, available up to 3.73 GHz. All models, available up to 3.60 GHz (“960” model). * All models, available up to 3.73 GHz (“965” model). *

* Older socket LGA775 motherboards do not support Pentium D, Pentium Extreme Edition, Core 2 Duo, Core 2 Extreme and Core 2 Quad CPUs. This happens because of the new power specs required by these CPUs

FSB Core 2 Duo Core 2 Extreme Core 2 Quad
533 MHz Not supported. Not supported. Not supported.
800 MHz So far only 1.80 GHz model (“E4300” model). Not supported. Not supported.
1,066 MHz All models, available up to 2.66 GHz (“E6700” model). So far only two models are available, X6800, a dual-core running at 2.93 GHz and QX6700, a quad-core running at 2.66 GHz. So far only 2.40 GHz model (“Q6600” model).

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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.