Installing Dimms; Use Ddr2 Dimms - Intel BOXDG35EC - Core2 Quad/LGA 775/ G35/FSB Product Manual

Intel Desktop Board DG35EC Product Guide

Installing DIMMs

To make sure you have the correct DIMM, place it on the illustration of the DDR2
DIMM in Figure 16. All the notches should match with the DDR2 DIMM.
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Figure 16. Use DDR2 DIMMs