like GoldEagle said:

Normally you should not mix RAM types and speeds, you only get optimal stability when using the same amount of RAM and type, preferable in pairs... except when your motheboard can mix types properly

About the SDRAM and EDORAM, the Simm's are on a different violtage compared to the Dimm's
I would suggest to put in only the 64 MB stick ---> you will have 64 MB of ram instead of the wrong 44MB output.