Optiplex Gx520 Xp

Computer Video, Processor, Ram.?
I have Dell Optiplex GX520. Got it in 2002. I can buy a new computer. But I dislike Vista. My question was would it be possible for me to upgrade my video card. To a higher one such as a Nvidia? I've wanted to upgrade my processor, but not sure if its possible. The reasons for that is so I can watch quality movies and to be able to play pc games.
My specs are
Microsoft Windows Xp
Home Edition
Version 2002
Service Pack 3
Intel(R) Celeron(R) CPU 2.66GHz 2.66GHz, 1.99 GB of Ram
and my video card is
Intel(R) 82945G Express Chipset Family.
From what I gather, and gathering is hard for as long a running model as the GX520, you have some sort of Intel 945 chipset. This basically means you may be able to use a Core 2 Duo processor, but not nessesarily. What you should be able to use, without doubt, is an Intel Pentium D processor. These are essentially dual core 64-bit pentium 4 based cpu's. They are no where near as powerful as Core 2 Duo's, but they get the job done for mild gaming and recreational use. My base line build for gaming would be ANY dual core, decent video card. I think a Pentium D 806 off ebay is your best bet at absolute compatibility. If you can get me the exact chipset of board on your system (message me) I can be more specific about which CPU would be best.
As for the video card, I suggest you get something with low power usage and less heat production, so a newer mid range card, especially the Radeon HD 4670, would be a good choice. This version is reasonably price and comes with a nice cooler from a good brand:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814125277&cm_re=4670-_-14-125-277-_-Product
It should play any modern game just fine, just don't expect to max everything made within the past few years.
THIS ASSUMES THAT YOU HAVE A PCI-Express X16 slot, which it looks like you do. Check and make sure first though, I recommend a visual inspection. Look for a slot with the same sort of configuration (may have different or no clip mechanism at the edge) as the blue and organge slots on this board (http://pc.watch.impress.co.jp/docs/2007/1119/tawada117_3.jpg) It is possible that you have an AGP-8X slot. That looks like (http://www.techsoup.org/binaries/Files/motherboard_opt.jpg) that. If you have one of those, your best bet is to try and ebay a Radeon X1950pro agp.
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