Hi, I'm looking to purchase a couple upgrades for my ancient Dell Dimension 2400. Right off the bat, let me state that I am fully aware how old this system is, and that it is very limited (e.g. it only has PCI slots, no AGP or PCI-E). I am also aware that for the money I propose to spend, I could get a new, much faster computer. Having said that, I am not interested in doing so. I Have 2GB of RAM, with as much hard drive space as I need. I have a 2.4 GHZ Celeron processor and a 64 MB integrated graphics chip, and a standard power supply, which I believe is 200 or 250W. I am running Windows XP SP3. My first proposed upgrade is from my 2.4 GHZ Celeron to a 3.06 GHZ Pentium 4. http://www.compuvest.com/Desc.jsp;jsessionid=c1b1f271ce88f0f68ef02e71b91e?iid=846286 My second proposed upgrade is a Sparkle GeForce 9500 GT 1024 MB PCI graphics card. http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5771192&CatId=1603 My questions are, will these parts be compatible with my computer, and will I need a bigger power supply for them? The graphics card says it needs a 400W PCI-E compliant power system, and a PCI-E power connector. I have also been looking at the following replacement power supply: http://www.cputopia.com/hp-480w-dell-dimension-2400.html Do I need this, and will it work with the card, or at all? It also seems surprisingly cheap, should I be worried about that? Also, would overclocking any parts of this computer totally destroy it? I figure it would probably be a bad idea on something this old, but am I wrong? Answers to any of my questions or other advice is greatly appreciated. Thank you!