I categorize 'top line' and 'mid range' based on GPU, as each line will obviously have several cards based off the same die.
4870 / 4850 were exceptions because in this generation, ATI either didnt feel the need to, or weren't able to deliver single GPU cards in the high end section. Both the 4850, and 4870 were actually mid range cards based on their prices (£150-£200), and ATI used the 4870 X2 to compete in the high end segment.
Curently from Nvidia, 'top line' would be G110, while 'mid range' would be G114. From AMD, top line would be 6950 / 6970, while mid range would be 6850 / 6870.
The mid range cards for the last several generations have been incredibly attractive for their price / performance / watt, especially when comparing the performance of two mid range cards to a single high end, which in most cases have consistently performed better than the single high end offering, and each midrange card was on par with the previous high end in single GPU comparisons while being a lot more efficient.
High end GPUs are really only a requirement for people running at 2560x resolutions, or surround setups. For most gamers playing at 1920x1200 or below, there are havnt been any advantages to be had from buying high end cards for a long time.
Current high end setups consisting of builds based on the 6950 / 6970 or GTX 570 / 580 will be at least matched, if not surpassed by the next gen midrange along with much lower cost, power consumption, temperatures and noise.




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