Girlfriend has cheap Compaq with Sempron 3800+, Windows XP and 512 meg Ram. As I bought the Orange Box, I can now give away my previous copy of HL2. I have a 7600GT in my system and it plays HL2 flawlessly. As it doesn't require an external power connection, I figure it's not too power hungry and wondered if it would tax the above mentioned Compaq if I bought and put one in there so I could give HL2 for her son. I'm sure it's a very wimpy power supply, would the 7600GT put it over the edge? If you think it would if I looked for a bargain power supply that might be good enough and replaced with that at time of installing video card, do you think it would still be a waste due to low processor and low memory?