Memory Upgrade to 8gb Dell R200

Hi all i have a new kit of Elpida 2GB 2Rx8 PC2-5300P-555 8GB Memory but if i put 8GB in the server the server bleeps and wont boot even whit one stick

i got the datasheet http://pdf1.alldatasheet.com/datasheet-pdf/view/308635/ELPIDA/EBE21AD4AJFA-6E-E.html

Thanks for the support