Hello again [NAME],   Thank you for sending me your Service Tag.  Here you have some compatible 2GB part numbers: UW729, UM139, 9W657 And some 4 GB part numbers: UW730, DR397, MWP63   Regards. 
hello  i d like to know the dell part number of memories to upgrade my server its a Poweredge 2900 and the memories are 512 ( MR 570) but I d like to buy 2 or 4 GB    thanks 
RAM Poweredge2900