The whole CPU vs. GPU issue with FSX has come about because of the shift from single-core to dual/quad-core CPU's...
What a lot of people have failed to realise, is that a Dual-core does not necessarily = faster than single-core...
A good example of this was when I first got my Dual Core CPU.... Mike and his Single Core P4 3.0 GHz machine ran FSX better than my flash new (at the time) Core2Duo E6400... despite my CPU being 2 generations newer than his!
The (over)simple reason was his CPU was 3.0GHz and mine was only 2.16GHz... (putting aside architecture improvements ie. smaller manufacturing process 90nm vs. 65nm, bigger cache etc). I'm fairly sure my dual monitors didn't help matters either...
You see, the individual core's on a Dual Core Machine tend to have a slower clock speed than the single core machines... but by putting two of them together you 'double the speed' (a simple explanation that is not exactly true, and only when actually using both cores etc.)...
So for guys who are running single core P4's in the 3GHz+ Range... with older GPU's with smaller mem (ie 128 or 256megs), you might find sticking with the old CPU and upgrading the GPU = big increase in visuals and performance... as opposed to getting a new CPU, unless you're stepping up to the top end of the CPU range...
FSX is a tricky one, as there is no 'magic bullet'... it really does require the right combination of CPU, GPU, RAM etc...
I think it is a conspiracy between Mobo, RAM, CPU & GPU manufacturers and Microsoft!!
