Gigabyte GA-945GCM-S2L - Hardware Installation Guide; Installation Precautions

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(Note 1) Enable use of a Core™ 2 CPU with 1333 MHz FSB through overclocking. You must install the
FSB 1333 MHz Core™2 CPU with DDR2 533 (or above) memory module(s).
(Note 2) Use of a 1066/800 MHz FSB CPU is required if you wish to install DDR2 667 MHz memory.
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