Performance drop with higher res

I am getting a 22" 1920x1080 monitor and was wondering how much a
performance drop I am going to see. I am coming from a 19" 1440x900
monitor.

For example right now in Far Cry 2 when I am in action
I get like ~30fps. While I am just cruising I get like 40. (this is at
1440x900)

What kind of performance will I get at 1920x1080?

What Video Card do you have.

If your video card has 1GB of vram then you should do pretty good. Just to make you feel better, my crysis benchmarks at the 1100 resolution is 47fps when I turn it up to 1680x1050 it's 35fps on my xfx 4850 1GB.

1440x900 to 1920x1080 is a pretty big jump in resolution so depending on your card you will lose maybe 5-10fps. (Just a guess, maybe more maybe less. lol)

But just turn down AA if you have it enabled. This will help your fps pretty good.

But seeing as how you only get 30fps in FC2 already with that resolution, I think you should have upgraded your card. FC2 is not very demanding at all.

I have a 9800GTX and a Q6600.

I am playing at 4XAA on very high. DX9

Well... you MIGHT have to crank the AA down if it gets below 30fps... hard to say actually