Well if it isn't a desktop CPU then it's aimed at workstations/servers. Intel has that covered too.
Wrong thread for this so i'll move on.
Using:
http://www.anandtech.com/show/5261/amd-radeon-hd-7970-review/22
and the cheapest versions of the cards on OcUK assuming no overclocking.
Overall
HD 6950: £180/33.4 = ~£5.40 per FPS **7th fastest**
GTX570 : £250/38.6 = ~£6.48 per FPS **5th fastest**
HD 6970: £250/38.1 = ~£6.56 per FPS **6th fastest**
HD 6990: £540/67.6 = ~£7.99 per FPS
**1st fastest**
GTX580 : £360/44.0 = ~£8.18 per FPS **4th fastest**
HD 7970: £420/49.7 = ~£8.45 per FPS
**3rd fastest**
GTX590 : £600/66.0 = ~£9.09 per FPS
**2nd fastest**
GTX590 is clearly way overpriced, and so is the 580 to some extent.
7970 needs to drop to ~£370 (£7.44 per FPS) for it to fall inline relative to it's performance to dual GPU cards.
Single Die Cards only
HD 6950: £180/33.4 = ~£5.40 per FPS **5th fastest**
GTX570 : £250/38.6 = ~£6.48 per FPS
**3rd fastest** - Although this is pretty tight with the 6970 - if the wind blows in the right direction they are basically the same.
HD 6970: £250/38.1 = ~£6.56 per FPS **4th fastest**
GTX580 : £360/44.0 = ~£8.18 per FPS
**2nd fastest**
HD 7970: £420/49.7 = ~£8.45 per FPS
**1st fastest**
However, when looking at single cards only, the price is strangely linear...
You want the best? You pay a premium I'm afraid...
The 5 and 6 series may not have dropped because A) They were/are chasing nvidia in terms of single die performance, B) they are actually relativety cheap as it is, C) The 5 series cards were similar performance to the 6-series cards.
Pure Guess: The 7950 will address some of the balance, it will fall in line at about the £350 mark at release with a ratio of around £7.50/FPS.