No. Review section 1.4 on page 16 of the technical specification: http://downloadmirror.intel.com/15115/eng/D945GCNL_TechProdSpec.pdf
This [OLD] board supports 2GB maximum.
Also, do not be afraid to release the CAPS LOCK.
This message was posted on behalf of Intel Corporation
I just wanted to let you know that the answers provided by Al Hill and N. Scott Pearson are correct; the maximum size of memory for the Intel® D945GCNL is 2GB.
And in regard to the Intel® 945G Express Chipset, that maximum size of memory that it supports will be 4GB.