Look at it this way, if raising the core clock to 600 and eliminating the memory bottleneck with even faster DDRII on a 256-bit bus could give twice the performance of the FX, that would imply the current FX design was so memory bandwidth limited, that you could clock the core back to 300 MHz while keeping the memory at 500 MHz and you wouldn't see much of a performance drop. I would bet that's not the case even at 1600x1200 w/ 8x AA and 8x Aniso.
As for the profit per share calculations, without the X-Box revenue I think it would be closer to 6 cents per share. Assuming net income = revenue - expenses, we know net income including X-Box settlement, and we know the revenue including the X-Box settlement as well as the ammount of the settlement, and expenses remain constant. So if we decrease revenue by $40.4 Million, we decrease net income by $40.4 Million as well, giving us $10.5 Million. Their shares were based on net income, not net profit, so 30 cents a share at $50.9 Million revenue would be about 6 cents a share at $10.5 Million.