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AMD has said that Nvidia's GK110 chip is about 30% bigger than AMD's upcoming Hawaii chip, and that it the top Hawaii card will cost a lot less than $1000.
Purportedly leaked pictures show 16 memory chips, which presumably means a 512-bit memory bus. If so, this would be the fourth GPU chip to ever have a 512-bit memory bus, following in the footsteps of the Radeon HD 2900 XT, GeForce GTX 280, and GeForce GTX 285. The first of those was a bad card, the second suddenly seemed ridiculous when the Radeon HD 4870 showed up two months later, and the third was a GDDR3 card trying to compensate for living in a GDDR5 era by being really expensive. But none had the benefit of being launched onto an old, mature process node when there wasn't a newer, better process node available, as Hawaii will have.
Benchmarks, on the other hand, are much easier to fake than photographs. So claims of Hawaii being a little faster than Titan should be taken with appropriate caution. Still, the die size makes a 40 CU part that nearly doubles the performance of a Radeon HD 7870 into a real possibility, and that would put it in Titan territory on performance. Whether you can do that without blowing out the power budget is a different question, but AMD might take Titan's approach of more CUs clocked a little lower to save on power.
Still, we'll know more in two days, as AMD has an event to reveal the parts, in Hawaii appropriately enough. Actual retail availability of hardware is likely a month or so later. With it looking like 20 nm isn't going to be a terribly important process node, if Hawaii can hang with Titan, there probably won't be anything all that much faster coming until 16 nm in 2015.