cheers for the reply.
I know the card isnt blocking all the flow but the card is so long it meets the hard drive and stops the cool air rising. So the only air getting up to the CPU is the air that circulates around the graphics card through the 4cm gap between it and the side panel. Plus the 8800 puts out a lot of heat and this combine with the hot Northbridge means all the air going to the CPU is 5 degrees above ambient.
I will definately stick the new fan on the side panel coz i already have a 120 mm akasa fan that will perfectly suit. Plus i imagine the dominator RAM will love that.
Quick follow up Q. To fan filter or not to fan filter.