I know why.............
What everyone seems to forget was that when Sony first started talking about the CELL it was suppose to be the only chip in the system. There initially wasn't suppose to be a graphics chip. They touted the cell as a floating points and physics monster also capable of rendering graphics. At some point this fell to the way side and they introduced a graphics chip. The RSX doesn't do all the graphics workload itself the cell processor is able to assist, heavily. At one point sony was parading around figures that showed what the cell was capable of and what the cell and RSX together were capable of. At the time, 2004, the numbers were crazy.
As for the graphics card being more important than CPU, I've known this forever. The last time I built a gaming computer from the ground up was 2001. I bought the most advanced motherboard and a 2nd tier proccessor I could find at the time. I only had 512mb of ram and a top of the line geforce 4. By just upgrading the ram to 3gig, the graphics card, and over clocking. I was still able to play most games at good settings two falls ago. Then a fan crapped out when I was at work and my g/f was on the computer. She didn't know and frrrrryyyyy. Really though I couldn't have taken it much farther AGP was holding me back. I can't remember what the graphics card was but it was one of the last good ones to come out for AGP.
My PC build strategy has always been: Top tier motherboard with onboard sound and network, scrimp on HDD size and Optical drive,cheap case that I cut ventilation holes in to add fans, 2nd tier processor, minimum ram for the times, and monster graphics card. Overclock as much as possible. I can usually undercut builds I see on the internet by about $250 and still get the same performance. I usually start throwing ram into it after a year.
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