Well, it is a Pent4, 630, 3.0GHz, HT w/800MHz FSB, Socket 775, and as damasta indicates, does have the 64-bit technology (EM64T).
This is a new HP PC introduced Feb 15, 2005 and has all the bell & whistles, with 1GB RAM, 250GB Hard Drive, etc, but IMO HP should have used a different chipset than the 915GV, which means the PC does not have an AGP slot or PCI-Express x16 slot for a video card. They are also using their standard motherboard apparently made special for HP by Asus PTGD1-LA (Goldfish2-GL8E) which I cannot find listed on the Asus site.
The PC does have the integrated (on-board)Intel Graphics Media Accelerator 900 (GMA900) which should be able to handle the little gaming you do, but will not play some higher end modern games, and your PC will not be able to upgrade the graphics in the future.
Notice that particular HP model is listed online for $1000 without a monitor. If you desire to stay with Pent4 and the 630 series with 64-bit I would suggest the Dell 8400. The Dell 8xxx series is their top of the line besides their XPS gamer model,and includes one of the new PCI-Express x16 Video Cards. Click http://tinyurl.com/6h7p4 and select the same features as the HP model and with a 160GB hard drive, 17" monitor, and PCI-Express x16 video card, should come out to $974 with free shipping. Upgrading to 250MB hard drive from 160HG would cost an additional $80.
BTW Dell changes their free stuff and juggles their prices around almost every week
Course' your young child can take over your old PC. 