See following video of the HP Pavilion DM1z which as the single core Athlon II Neo processor (1.7 GHz) and ATI Radeon HD 4225 graphics. Of course a single core CPU has a disadvantage compared to a dual core CPU since many games can utilize two cores.
While the Athlon II Neo x2 K325 is a dual core CPU; it is only 1.3GHz which is extremely weak. I highly recommend you get a 2.0GHz for faster CPU if you want to play games.
Here's a gameplay video for Crysis using an Intel GMA 4500 integrated video, however there is no mention of the CPU's specs. It is less powerful than the ATI HD 4225, but the HD 4225 is still considered entry level.