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Depends on the utilization of both the first and second card. Any CPU limitation or lack of SLI optimization will affect overall power draw, so any power usage need to take into account workload.Well there is no doubt that a 290X uses much more power, its plainly obvious in that fact since the 980 uses less power than the 780ti which uses less power than the 290X. That being said I find it hard to see a second 980 only adding 100watts as that seem to be more of a low ball park seeing as how the power usage at high stress is around ~180watts for a single card on its own depending of course on clocks and cooler. However its still significantly less in the long run...
I think you'll find that Tonga isn't Tahiti's successor (just as GM 204 isn't GK 110's successor - successors don't usually have the same ballpark performance as the chip their replacing) it is Pitcairn/Curacao's successor. Tahiti's successor will be Bermuda (Pirate Islands). Fiji, AMD large die answer to GM 200, does not have current analogue in AMD's lineup. BTW: Tonga is Volcanic Islands not Pirate Islands. There is an overlap of architectural tweaks that crosses GPU series with AMD (Hawaii, Bonaire - Sea Islands, Curacao - Southern Islands, Tonga, Iceland(?) - Volcanic Islands, Bermuda, Fiji - Pirate Islands)Tonga is similar to the GM 107 chip in that it was a new chip to give a taste of something to come. Difference here is that it was designated to replace the aging Tahiti Architecture while showing us a few improvements and offering as a decent midrange price
No but it certainly wont help matters. Bear in mind that this also has a roll-on effect:AMD's R&D is not in danger of losing everything just because of this...
1. Mobile GM 204 (and likely GM 206 will be mobile-centric) will definitely be on OEM's radars.
2. Guaranteed a 10-11 SMM GTX 960 creates pressure on the lower high volume segment of the product stack, and I'm also betting that Nvidia is holding a 14-15 SMM GTX 970 Ti in reserve just in case AMD bring out a fully enabled Tonga SKU. A pricing realignment would just compound the present situation.
3. With a wider uptake of GM 204 cards - and I've seen a number of forumers here and elsewhere looking to change camps if they already haven't done so - it marginalizes even further Mantle and AMD's other features as the installed user base decreases in relation to the opposition (and IMO AMD's Mantle/Gaming Evolved growth led directly to the GTX 970's aggressive pricing). AMD have already invested time, money and effort into making Radeon a more saleable proposition. A large part of that is being obliterated by a shift in current sales. What is the point of Mantle if the oppositions DX11 cards peg performance equal/higher? Without the hardware to walk-the-walk, the features talk-the-talk becomes rather more insignificant.