if you dont want to change the motherboard you are locked to old technology. these are your options
ntel Quad-Core Xeon E/X/L 5xxx
Intel Core 2 Extreme QX9775
but a lot of places no longer sell them brand new, so check your suppliers. you may have to go to ebay!
I would upgrade your ram to 8gb
a GT630 isnt that good, look to get a ATI 7850 if you have PCI e 2.0 or better
Thanks, my computer can run bf3 and I think I will upgrade the cpu and the ram to 8gb. Do you think I can run games better then or will it matter if i upgrade to two gt 630 4gb graphic cards. What should i upgrade first because I don't think I will upgrade everything at once.
The 630 isn't really a gaming card and if I am not mistaken, does not have SLI connectors so that is out the question anyway. If you want to play Crysis 3, I say start saving up for a new PC. Depending on your other system specs, at minimum, you will need Motherboard, CPU, Ram, and a GPU.
Well given that your CPU doesn't even meet the minimum requirements, that needs to go first. What motherboard do you have? Also, what is your general location. If there is a Microcenter nearby, that might change up your options some.