The system requirement document for GridServer 6 is now available on www.customer.datasynapse.com under Files/GridServer/GridServer 6.0/GSSysReqs.pdf. Direct link: http://customer.datasynapse.com/aidix/BrowseControl.do?state=browse&context=GridServer&path=.%2FGridServer+6.0%2FGSSysReqs.pdf
Please feel free to contact us if you have any question or issue.