Satellite M40X Part number: PSM4XEUG3. Satellite M40X Windows® XP Home Edition. Hard disk 60 GB; MB, DDR RAM; maximum life. I want to add 1G of ram kingston KTTA/1A to my existing mb of ram. My M40X-Z has two ram stick slots for a maximum of 2GB ram. by Mathew Randall, Victoria Australia. Toshiba's promotional guide explains the Satellite M40 as a “stylish, lightweight notebook that comes in.