"Priced at $139, the Radeon R7 260X makes building gaming-ready desktops under $400 possible. It succeeds either the Radeon HD 7670 or the HD 7770, depending on how you interpret AMD's new nomenclature. The R9 290 series will succeed the HD 7900 series in the product stack; R9 280 series succeeds the HD 7800 series (sub-$300 class), and R9 270 series succeeds the HD 7700 series (sub-$200 class); but since such an arbitrary product stack repositioning would create unreal price-performance increments at the price points the various HD 7000 series products launched at, AMD tweaked pricing a little, so there’s really a different, and equally valid way of looking at AMD’s new product stack, using price-points."
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AMD Radeon R7 260X 2 GB Review | techPowerUp
"The $199 AMD Radeon R9 270X, in that sense, draws its lineage more from the Radeon HD 7800 series. The R9 270X is, for all intents and purposes, identical to the Radeon HD 7870 GHz Edition, which launched at $350, but settled down to around $250, and held on to that price-point quite well, and for quite long. It has 5 percent higher GPU core clock speeds, at 1050 MHz, but a significant 16 percent higher memory clock speeds, at 1400 MHz (5.60 GT/s effective), than the HD 7870."
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AMD Radeon R9 270X 2 GB Review | techPowerUp
"The Radeon R9 280X we have with us today is an interesting proposition for $299. It’s fundamentally identical to the Radeon HD 7970 GHz Edition from last year, but sells at a price that isn't too far off from the $249.99, which the Radeon HD 7870 debuted at. Under the hood, the card is based on the same 28 nm "Tahiti" silicon that proved to be AMD's workhorse performance-segment chip for the better part of the two years."
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MSI R9 280X GAMING 3 GB Review | techPowerUp