COD WAW and COD4 has the same fps up and downs too,until i check off the dual vid card option in the game settings even though i only have a single card(strange eh)

Yeah I remember that was on by default with my 8800gt too, but not with the 4870. Sync every frame is also turned off, but even when its turned on i still get the drops.

Weird. I checked that box as I run dual video cards and I dont have this issue. or maybe I do somewhat and just not noticing it. I should give fraps a go and test that.