First recommendation flash the tsop or modchip with a compatible bios for 128mb ram like IND BIOS 5004.67 or Xecuter bios,use samsung ram chips QC-50 i recommend use new ram chips from ut source,on xbox 1.0-1.1 motherboard versions already comes with solder on the ram pads use a fiberglass pen to expose the pads so then can be easy to solder the ram to the pads on the motherboard,use plenty of flux to solder,very important the ram have a circular mark and the motherboard also has a circular mark that is the orientation,the rams that are already installed on the board let you know how the new installed ones are going,finally use the xblast os to test the ram chips.