supported memory pdf doc
info below from above link
Model Name: MA770-DS3 DDR2 1066 (JDEC DIMM)
Size Module
Supplier Module P/N. SS/DS Comp. Used Component P/N. Single-channel Dual-channel
512MB AENEON AXT660UD00-19DC97X SS One pcs Two pcs
1GB AENEON AXT760UD00-19DC97X DS One pcs Two pcs
1GB Kingston KVR1066D2N7/1G DS ELPIDA E5108AJBG-1J-E One pcs Two pcs
512MB Qimonda HYS64T128020EU-1.9-C SS Qimonda HYB18T512800CF19 One pcs Two pcs
1GB Qimonda HYS64T128020EU-1.9-C DS Qimonda HYB18T512800CF19 One pcs Two pcs
Note: Due to AMD AM2+ CPU limitation, DDR2 1066 is only supported by 1 dimm per channel.
i think it will come down to how ram spec have been stored ie jdec or epp and if you are using 1 or 2 gb sticks, (i noticed you saying about 4 gb ram in first post)