Had hl2 since it came out - was running fine except for a few jerky bits at the beggining of levels, and now its jerking and looping sounds so much as to make playing it v v v annoying!!!!!! Ive tried lowering the res to 1024x768 from 1280x1024 and this made no difference. Its all at medium detail with no aa etc. Ive got a 9800p and 512mb ram with an A64 3200 all at stock speeds. Ive noticed the hdd goes crazy during the game but ive defragged it to no avail and am wondering if its a ram issue?? How much ram are you guys using with hl2? Would 1gb really really benefit me?