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Is there any limitation of using DDR SDRAM modules on AT7/AT7E?

For PC1600 / 2100 DDR SDRAM Supports 6 banks up to 3 GB DRAMs for unbuffered DDR SDRAM modules. Supports 8 banks up to 3.5 GB DRAMs for registered DDR SDRAM modules. For PC2700 DDR SDRAM Supports 4 banks up to 2 GB DRAMs for unbuffered DDR SDRAM modules. Supports 6 banks up to 3 GB DRAMs for registered DDR SDRAM modules. Please install DDR SDRAM from DIMM#1 first or follow our recommendation in DDR memory test report which published on web page. AT7 does not support mixing install both unbuffered DDR and registered DDR at the same time.