I bought a new PC in December, but i bought a new graphic card (Geforce 6800GT) a week before the rest (the store where i bought the PC didn't have the graphic card).
So i played RTW first with my old PC and old graphic card (P4 2.2 Geforce TI4600 512MB RAM)
Then i played RTW with my old PC and the 6800GT.
Now i play with an AMD 3500+, 1GB RAM and the 6800GT.
So i can directly see the difference between the CPU and graphic card.
I played RTW in 1024x768, with settings on medium with the P4/Ti4600. When i installed the 6800GT in that machine, the big difference was that i could go to 1600x1200 and put most settings ingame at max with the same, or even better performance!
So, the better graphic card didn't improve frames/sec that much (maybe 15-25%), but it made the game look much, MUCH, better.
With the new PC though, RTW simply flies.
So, if you have a CPU that can handle RTW ok, but you can't max out resolution/graphic settings, you will certainly benefit from a better graphic card. But if the CPU barely can cope, a new graphic card might not be what you need.
But, it's never good to have a system with to big a leap between component.
A P3 with a Geforce6800Ultra for example would not take very good advantage of the 6800. And the oppostite, for example an AMD FX CPU with a Geforce2 wouldn't be much better.
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