The HP and corresponding Compaq Athlon 64 notebooks top out at 64mb dedicated RAM. You want to have 64mb dedicated RAM to play any of the newer games at all (like Doom 3) at reduced settings.
You don't want to buy any notebook computer with shared/integrated video RAM or any notebook with less than 64mb dedicated RAM if you will play games.
You are better off though if you can afford it to get an ATI 9700 video card with 128mb dedicated RAM for the best solution on a mainstream notebook.
I don't know of any Athlon 64 notebook that has over 64mb dedicated video yet but if you find one buy it as it is 64bit for the future.
If you are ok with 64mb dedicated get the Athlon 64 or if you want 128mb dedicated video look at the Dell 8600 (Pentium M Centrino -- 15.4" LCD, 6.9 pounds). Or, if you don't care about heat and weight (9 pounds) you can look at the Pentium 4M hpzd7000 (see zd7000forums.com) which has the ATI 9700 video card also. But the battery life with that is under 2 hours (17" LCD) and the Dell 8600 Centrino will get you 3.5-5 hours in normal use --battery life while game playing using the hard drive alot will be lower but still likely double the Pentium 4M notebook.
compaq presario with a geforce 4 440 go 512 mb 1.8 ghz
is this a decent laptop for gaming