Ok, your not too far away from my computer (I don't have a dual core, and my motherboard isn't quite as nice, but I have more RAM and a better video card, so in the end it probably evens out quite nicely) and it just so happens I have played most of those games, so I will help ya out!
* Devil May Cry 4 - I can play it with the max settings with a rock steady 50-60 fps, this title was optimized perfectly for PC, don't worry about it
* Lost Planet - It'll run, you will probably want to keep things at about medium to high, but it will run. Like a lot of console games ported to PC it is a memory hog, or at least that is what I remember.
* Assassin's Creed- Never played it, I don't have a dual core...
* Gears of War - See Lost Planet
* Crysis - Never tried with mine, but from what I have heard, it is fairly scalable, so you should be able to go with medium settings with no problem
* Call of Duty 4 - This will run nicely
* The Orange Box - I have a theory that you can actually install the Orange Box on a toaster and it will run fine. The Source engine let's you scale things back to amazing levels, not that you will need to. You will be fine
* Bioshock- I run it on high with no slowdown, no reason that computer shouldn't be able to do the same.
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