I have two of those CPU's here, with Asus P4C800E Mobo & Asus P4C800E Deluxe mobo. There is Lots of RAM available along with AGP Grapics cards. One is nVidia & the other an AMD Saphire Radeon affair. They are all now retired from service and for sale if you're interested.
AGP graphics will be no good to you if your mobo has PCIe of course.
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This machine has PCIe for graphics.
When did AGP start to fall out of fashion? I still use it in old computers, but I haven't seen it around on newer systems for quite a few years.
I might just get an HD7770 off ebay. They seem quite plentiful
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