No, sorry. I'm saying taht i can't find your boards detailed anywhere on the internet, and I can only find the Ultra versions details.
I expect them to be almost the same, so I'd expect it to use the same RAM speeds and support about 1GB of memory. This is usually the minimum these days, and don't go any lower than that.
It will definetly support another 256Mb stick of speed 2100 DDR SDRAM I'm sure.
Does Everest say the speed of the RAM the computer has in at the moment?