yah lol...its like playing mario with a p4 pc lol
No. That's very misleading.
You should be fine for MTW2, I can max that out on my rig (19x12), and was able to max it out on a Dual Core, with 2x4870s.
However, I can NOT max out ETW. This is a very demanding game, and it seems to be GPU limited on my machine. Crossfire 4870s are probably more powerful than a 5770, so you will find you have to ease back on some of the in game settings.