Again, it was only tested with the following memory>The motherboard has two DIMM (Dual Inline Memory Module) sockets (onepopulated from the factory). The BIOS can automatically detect the memorytype, size, and speed through SMBUS interface between the core chipset andDIMM module.DIMM Specifications168 Pin DIMM SDRAM3.3 VoltsUnbufferedNon-ECC (Non Parity)100 MHz PC100Single or Double SidedSupports 16 MB, 32 MB, 64 MB, or 128 MB for a maximum of 256 MB on board.PC133 ram may work but it has not been tested with this system.High-Density may work but I can't say for sure.Sincerely,Chris