Adding Memory to a White MacBook 2.16 Ghz Intel Core Duo (Memory 1Gb 667 Mhz DDR2 SDRAM)

Good afternoon from London.
I want to put 2x2GB memory into my MacBook (mid 2007) but Apple support site specifies that the maximum amount of memory for this model is 2Gb. In other words, I can only add 2X1Gb.
What would happen if I proceed?

Thanks. They say the following, which I take to mean that I am good to go:
MacBook2,1 (All) - Install up to 4.0GB total memory, uses up to 3.0GB.
Note: Although limited to physically utilizing a maximum of 3GB, there is a performance
benefit due to 128 Bit addressing when 4GB( 2GB x 2 Matched set) is installed.

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