RRP will be irrelevant, they won't have a large supply so price gouging will be killing prices.
THe most important thing is that, the cheaper they are, the less they will ever sell.
They WILL make a loss on these, there is no question about that, a wafer costs $5k, these are hot lots(put in production the same time as the tape out chip) so could cost a little more than that, they are likely getting less than 20 cores per wafer, at best that makes them $250 for the core alone. That means at ZERO profit for Nvidia, theres another 12 memory chips at about $5 a chip that would be $60 for memory, $50 for a VERY complex pcb, $10-30 for the rest of the components, it looks VERY heavy on expensive high end power circuitry bits so closer to $30. So best case scenario is without packaging, extras and shipping they'll cost the best part of $400 without a single person in the chain getting ANY profit. Considering their partners won't sell them at zero profit, you add in a little profit for other guys in the chain and to cover the cost of extra's in the pack and Nvidia's taking a good $200 loss on every core.
Its unsustainable, they stopped selling the gt200b because they couldn't sell it at a profit, breaking even was simply pointless.
The cheaper the cards are, the more loss and the less they'll want to sell, the higher the price, the smaller a loss and the more they'll likely be willing to sell to save face.
Lets say they set a maximum loss for the face saving sale of Fermi's, its its $50mil, if they were taking a $200 loss per card, they'd go past $50mil at 250k cards sold, thats 470gtx and 480gtx and any other parts.
If they are taking a $400 loss(by selling them cheaper to compete with AMD prices) then they would only be able to sell 125k before hitting the same loss levels.
Remember that 20 cores per wafer is likely very generous, if its under 10 per wafer the cost per core without any profit, shoots up to $500, add on all the other bits and its a $700 card without a single person getting profit, or any extra's anywhere, real costs and adding profit turn it into a hugely expensive card. No one but Nvidia will be eating the loss on the cores. To sell a 470gtx at £300 or $450, Nvidia could be looking at anything up to a $500 loss per card.
Anyone that thinks Nvidia will sell them long term and continually make a loss is barking mad.
The biggest issue is, Nvidia know selling 250k cards even at insane pricing, will be easy as anything, there are people out there simply not willing to buy AMD cards, there are people out there who will only buy a card that does physx. Selling 5million at £600 would be impossible, selling 250k would be easy, very easy, I can't see why Nvidia would bother selling them that cheap if they do only do a very limited run.