this website says this
http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c00798873-36
Chipset
Intel Q965 Express chipset
Hard drives
One or two of the following
80-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 rpm)
160-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 rpm)
250-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 rpm)
RAID 80-GB SATA 3.0-Gb/s Hard Drive (7200 rpm)
RAID 160-GB SATA 3.0-Gb/s Hard Drive (7200 rpm)
2nd hard drive, 80-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 rpm)
2nd hard drive, 160-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 rpm)
2nd hard drive, 250-GB SATA 3.0-Gb/s Hard Drive (8MB Cache, 7200 rpm)
also what is max ram for this hp dc7700 computer?